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</pre><pre class='rust '>
<span class='doccomment'>//! A macro which makes errors easy to write</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Minimum type is like this:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! #[macro_use] extern crate quick_error;</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! quick_error! {</span>
<span class='doccomment'>//! #[derive(Debug)]</span>
<span class='doccomment'>//! pub enum SomeError {</span>
<span class='doccomment'>//! Variant1 {}</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//! Both ``pub`` and non-public types may be declared, and all meta attributes</span>
<span class='doccomment'>//! (such as ``#[derive(Debug)]``) are forwarded as is. The `Debug` must be</span>
<span class='doccomment'>//! implemented (but you may do that youself if you like).</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! The documentation comments ``/// something`` on variants are allowed, but</span>
<span class='doccomment'>//! you must either put them on all variants or on none of them (to the best</span>
<span class='doccomment'>//! of my understanding it's limitation of rust macro system)</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! You may add arbitrary parameters to any struct variant:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! quick_error! {</span>
<span class='doccomment'>//! #[derive(Debug)]</span>
<span class='doccomment'>//! pub enum SomeError {</span>
<span class='doccomment'>//! /// IO Error</span>
<span class='doccomment'>//! Io(err: io::Error) {}</span>
<span class='doccomment'>//! /// Arbitrary system error</span>
<span class='doccomment'>//! Sys(errno: nix::Errno) {}</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Note unlike in normal Enum decarations you declare names of fields (which</span>
<span class='doccomment'>//! are omitted from type). How they can be used is outlined below.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Now you might have noticed trailing braces `{}`. They are used to define</span>
<span class='doccomment'>//! implementations. By default:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! * `Error::description()` returns variant name as static string</span>
<span class='doccomment'>//! * `Error::cause()` returns None (even if type wraps some value)</span>
<span class='doccomment'>//! * `Display` outputs `description()`</span>
<span class='doccomment'>//! * No `From` implementations are defined</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! To define description simply add `description(value)` inside braces:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! quick_error! {</span>
<span class='doccomment'>//! #[derive(Debug)]</span>
<span class='doccomment'>//! pub enum SomeError {</span>
<span class='doccomment'>//! Io(err: io::Error) {</span>
<span class='doccomment'>//! description(err.description())</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! Sys(errno: nix::Errno) {</span>
<span class='doccomment'>//! description("system error")</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Normal rules for borrowing apply. So most of the time description either</span>
<span class='doccomment'>//! returns constant string or forwards description from enclosed type.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! To change `cause` method to return some error, add `cause(value)`, for</span>
<span class='doccomment'>//! example:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! quick_error! {</span>
<span class='doccomment'>//! #[derive(Debug)]</span>
<span class='doccomment'>//! pub enum SomeError {</span>
<span class='doccomment'>//! Io(err: io::Error) {</span>
<span class='doccomment'>//! cause(err)</span>
<span class='doccomment'>//! description(err.description())</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! Sys(errno: nix::Errno) {</span>
<span class='doccomment'>//! description("system error")</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//! Note you don't need to wrap value in `Some`, its implicit. In case you want</span>
<span class='doccomment'>//! `None` returned just omit the `cause`. You can't return `None`</span>
<span class='doccomment'>//! conditionally.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! To change how each clause is `Display`ed add `display(pattern,..args)`,</span>
<span class='doccomment'>//! for example:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! quick_error! {</span>
<span class='doccomment'>//! #[derive(Debug)]</span>
<span class='doccomment'>//! pub enum SomeError {</span>
<span class='doccomment'>//! Io(err: io::Error) {</span>
<span class='doccomment'>//! display("I/O error: {}", err)</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! Sys(errno: nix::Errno) {</span>
<span class='doccomment'>//! display("System error, errno ({:x})", errno)</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! To convert to the type from any other, use one of the three forms of</span>
<span class='doccomment'>//! `from` clause.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! For example, to convert simple wrapper use bare `from()`:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! quick_error! {</span>
<span class='doccomment'>//! #[derive(Debug)]</span>
<span class='doccomment'>//! pub enum SomeError {</span>
<span class='doccomment'>//! Io(err: io::Error) {</span>
<span class='doccomment'>//! from()</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! This implements ``From<io::Error>``.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! To convert to singleton enumeration type (discarding the value), use</span>
<span class='doccomment'>//! the `from(type)` form:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! quick_error! {</span>
<span class='doccomment'>//! #[derive(Debug)]</span>
<span class='doccomment'>//! pub enum SomeError {</span>
<span class='doccomment'>//! FormatError {</span>
<span class='doccomment'>//! from(std::fmt::Error)</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! And the most powerful form is `from(var: type) -> (arguments...)`. It</span>
<span class='doccomment'>//! might be used to convert to type with multiple arguments or for arbitrary</span>
<span class='doccomment'>//! value conversions:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! quick_error! {</span>
<span class='doccomment'>//! #[derive(Debug)]</span>
<span class='doccomment'>//! pub enum SomeError {</span>
<span class='doccomment'>//! FailedOperation(s: &'static str, errno: i32) {</span>
<span class='doccomment'>//! from(errno: i32) -> ("os error", i32)</span>
<span class='doccomment'>//! from(e: io::Error) -> ("io error", e.raw_os_error().unwrap())</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! /// Converts from both kinds of utf8 errors</span>
<span class='doccomment'>//! Utf8(err: std::str::Utf8Error) {</span>
<span class='doccomment'>//! from()</span>
<span class='doccomment'>//! from(err: std::string::FromUtf8Error) -> (err.utf8_error())</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! All forms of `from`, `display`, `description`, `cause` clauses can be</span>
<span class='doccomment'>//! combined and put in arbitrary order. Only `from` may be used multiple times</span>
<span class='doccomment'>//! in single variant of enumeration. Docstrings are also okay.</span>
<span class='doccomment'>//! Empty braces can't be omitted.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>/// Main macro that does all the work</span>
<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>quick_error</span> {
(<span class='comment'>// public with docstring</span>
$(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>:<span class='ident'>meta</span>]</span>)<span class='op'>*</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> {
$(
<span class='attribute'>#[<span class='ident'>doc</span><span class='op'>=</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>doc</span>:<span class='ident'>expr</span>]</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
)<span class='op'>*</span>
}
) <span class='op'>=></span> {
$(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>]</span>)<span class='op'>*</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
$(
<span class='attribute'>#[<span class='ident'>doc</span><span class='op'>=</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>doc</span>]</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>),<span class='op'>*</span> ) )<span class='op'>*</span>,
)<span class='op'>*</span>
}
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>IMPLEMENTATIONS</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> { $(
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span> }
)<span class='op'>*</span> });
$(
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span>);
)<span class='op'>*</span>
};
(<span class='comment'>// private with docstring</span>
$(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>:<span class='ident'>meta</span>]</span>)<span class='op'>*</span>
<span class='kw'>enum</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> {
$(
<span class='attribute'>#[<span class='ident'>doc</span><span class='op'>=</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>doc</span>:<span class='ident'>expr</span>]</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
)<span class='op'>*</span>
}
) <span class='op'>=></span> {
$(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>]</span>)<span class='op'>*</span>
<span class='kw'>enum</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
$(
<span class='attribute'>#[<span class='ident'>doc</span><span class='op'>=</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>doc</span>]</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>),<span class='op'>*</span> ) )<span class='op'>*</span>,
)<span class='op'>*</span>
}
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>IMPLEMENTATIONS</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> { $(
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span> }
)<span class='op'>*</span> });
$(
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span>);
)<span class='op'>*</span>
};
(<span class='comment'>// public no meta</span>
$(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>:<span class='ident'>meta</span>]</span>)<span class='op'>*</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> {
$(
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
)<span class='op'>*</span>
}
) <span class='op'>=></span> {
$(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>]</span>)<span class='op'>*</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
$( <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>),<span class='op'>*</span> ) )<span class='op'>*</span>, )<span class='op'>*</span>
}
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>IMPLEMENTATIONS</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> { $(
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span> }
)<span class='op'>*</span> });
$(
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span>);
)<span class='op'>*</span>
};
(<span class='comment'>// private no meta</span>
$(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>:<span class='ident'>meta</span>]</span>)<span class='op'>*</span>
<span class='kw'>enum</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> {
$(
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
)<span class='op'>*</span>
}
) <span class='op'>=></span> {
$(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>]</span>)<span class='op'>*</span>
<span class='kw'>enum</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
$( <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>),<span class='op'>*</span> ) )<span class='op'>*</span>, )<span class='op'>*</span>
}
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>IMPLEMENTATIONS</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> { $(
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span> }
)<span class='op'>*</span> });
$(
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span>);
)<span class='op'>*</span>
};
(<span class='ident'>IMPLEMENTATIONS</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> {
$(
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>),<span class='op'>*</span> ) )<span class='op'>*</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
)<span class='op'>*</span>
}
) <span class='op'>=></span> {
<span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>unused</span>)]</span>
<span class='kw'>impl</span> ::<span class='ident'>std</span>::<span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> ::<span class='ident'>std</span>::<span class='ident'>fmt</span>::<span class='ident'>Formatter</span>)
<span class='op'>-></span> ::<span class='ident'>std</span>::<span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span>
{
<span class='kw'>match</span> <span class='self'>self</span> {
$(
<span class='kw-2'>&</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='kw-2'>ref</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>),<span class='op'>*</span> ) )<span class='op'>*</span> <span class='op'>=></span> {
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_DISPLAY_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> <span class='self'>self</span> <span class='ident'>fmt</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span> })
}
)<span class='op'>*</span>
}
}
}
<span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>unused</span>)]</span>
<span class='kw'>impl</span> ::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
<span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> {
<span class='kw'>match</span> <span class='self'>self</span> {
$(
<span class='kw-2'>&</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='kw-2'>ref</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>),<span class='op'>*</span> ) )<span class='op'>*</span> <span class='op'>=></span> {
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_DESCRIPTION_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> <span class='self'>self</span> <span class='ident'>fmt</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span> })
}
)<span class='op'>*</span>
}
}
<span class='kw'>fn</span> <span class='ident'>cause</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='kw-2'>&</span>::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span> {
$(
<span class='kw-2'>&</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> $( ( $(<span class='kw-2'>ref</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>),<span class='op'>*</span> ) )<span class='op'>*</span> <span class='op'>=></span> {
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_CAUSE_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span> })
}
)<span class='op'>*</span>
}
}
}
$(
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_FROM_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>funcs</span>)<span class='op'>*</span> });
)<span class='op'>*</span>
};
(<span class='ident'>FIND_DISPLAY_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='ident'>display</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>exprs</span>:<span class='ident'>expr</span>),<span class='op'>*</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='macro'>write</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>exprs</span>),<span class='op'>*</span>)
};
(<span class='ident'>FIND_DISPLAY_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>t</span>:<span class='ident'>tt</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_DISPLAY_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span> })
};
(<span class='ident'>FIND_DISPLAY_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ }
) <span class='op'>=></span> {
<span class='macro'>write</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>, <span class='string'>"{}"</span>, ::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span>::<span class='ident'>description</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span>))
};
(<span class='ident'>FIND_DESCRIPTION_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='ident'>description</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>expr</span>:<span class='ident'>expr</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>expr</span>
};
(<span class='ident'>FIND_DESCRIPTION_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>t</span>:<span class='ident'>tt</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_DESCRIPTION_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span> })
};
(<span class='ident'>FIND_DESCRIPTION_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>me</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ }
) <span class='op'>=></span> {
<span class='macro'>stringify</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>)
};
(<span class='ident'>FIND_CAUSE_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='ident'>cause</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>expr</span>:<span class='ident'>expr</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='prelude-val'>Some</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>expr</span>)
};
(<span class='ident'>FIND_CAUSE_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>t</span>:<span class='ident'>tt</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_CAUSE_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span> })
};
(<span class='ident'>FIND_CAUSE_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ }
) <span class='op'>=></span> {
<span class='prelude-val'>None</span>
};
(<span class='ident'>FIND_FROM_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='ident'>from</span>() $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
$( $(
<span class='kw'>impl</span> <span class='ident'>From</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span><span class='op'>></span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
<span class='kw'>fn</span> <span class='ident'>from</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>) <span class='op'>-></span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>)
}
}
)<span class='op'>*</span> )<span class='op'>*</span>
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_FROM_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span> });
};
(<span class='ident'>FIND_FROM_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span>
[ ]
{ <span class='ident'>from</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span>:<span class='ident'>ty</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='kw'>impl</span> <span class='ident'>From</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span><span class='op'>></span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
<span class='kw'>fn</span> <span class='ident'>from</span>(<span class='ident'>_discarded_error</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span>) <span class='op'>-></span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>
}
}
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_FROM_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> [ ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span> });
};
(<span class='ident'>FIND_FROM_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='ident'>from</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fvar</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span>:<span class='ident'>ty</span>) <span class='op'>-></span> ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>expr</span>:<span class='ident'>expr</span>),<span class='op'>*</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='kw'>impl</span> <span class='ident'>From</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span><span class='op'>></span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
<span class='kw'>fn</span> <span class='ident'>from</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fvar</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span>) <span class='op'>-></span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> {
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>expr</span>),<span class='op'>*</span>)
}
}
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_FROM_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span> [ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span> });
};
(<span class='ident'>FIND_FROM_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>t</span>:<span class='ident'>tt</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span> }
) <span class='op'>=></span> {
<span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>FIND_FROM_IMPL</span>
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span> });
};
(<span class='ident'>FIND_FROM_IMPL</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>item</span>:<span class='ident'>ident</span>
[ $( ( $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
{ }
) <span class='op'>=></span> {
};
<span class='comment'>// This one should match all allowed sequences in "funcs" but not match</span>
<span class='comment'>// anything else.</span>
<span class='comment'>// This is to contrast FIND_* clauses which just find stuff they need and</span>
<span class='comment'>// skip everything else completely</span>
(<span class='ident'>ERROR_CHECK</span> <span class='ident'>display</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>exprs</span>:<span class='ident'>expr</span>),<span class='op'>*</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span>)
<span class='op'>=></span> { <span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span>); };
(<span class='ident'>ERROR_CHECK</span> <span class='ident'>description</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>expr</span>:<span class='ident'>expr</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span>)
<span class='op'>=></span> { <span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span>); };
(<span class='ident'>ERROR_CHECK</span> <span class='ident'>cause</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>expr</span>:<span class='ident'>expr</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span>)
<span class='op'>=></span> { <span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span>); };
(<span class='ident'>ERROR_CHECK</span> <span class='ident'>from</span>() $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span>)
<span class='op'>=></span> { <span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span>); };
(<span class='ident'>ERROR_CHECK</span> <span class='ident'>from</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span>:<span class='ident'>ty</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span>)
<span class='op'>=></span> { <span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span>); };
(<span class='ident'>ERROR_CHECK</span> <span class='ident'>from</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fvar</span>:<span class='ident'>ident</span> : <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span>:<span class='ident'>ty</span>) <span class='op'>-></span> ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>e</span>:<span class='ident'>expr</span>),<span class='op'>*</span>) $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>:<span class='ident'>tt</span>)<span class='op'>*</span>)
<span class='op'>=></span> { <span class='macro'>quick_error</span><span class='macro'>!</span>(<span class='ident'>ERROR_CHECK</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>tail</span>)<span class='op'>*</span>); };
(<span class='ident'>ERROR_CHECK</span>) <span class='op'>=></span> {};
}
<span class='macro'>quick_error</span><span class='macro'>!</span> {
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Bare</span> {
<span class='doccomment'>/// First item</span>
<span class='ident'>One</span> {}
<span class='doccomment'>/// Second item</span>
<span class='ident'>Two</span> {}
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>test</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span>;
<span class='macro'>quick_error</span><span class='macro'>!</span> {
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Bare</span> {
<span class='doccomment'>/// First item</span>
<span class='ident'>One</span> {}
<span class='doccomment'>/// Second item</span>
<span class='ident'>Two</span> {}
}
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>bare_item_direct</span>() {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>Bare</span>::<span class='ident'>One</span>), <span class='string'>"One"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{:?}"</span>, <span class='ident'>Bare</span>::<span class='ident'>One</span>), <span class='string'>"One"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>Bare</span>::<span class='ident'>One</span>.<span class='ident'>description</span>(), <span class='string'>"One"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>Bare</span>::<span class='ident'>One</span>.<span class='ident'>cause</span>().<span class='ident'>is_none</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>bare_item_trait</span>() {
<span class='kw'>let</span> <span class='ident'>err</span>: <span class='kw-2'>&</span><span class='ident'>Error</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='ident'>Bare</span>::<span class='ident'>Two</span>;
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>err</span>), <span class='string'>"Two"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{:?}"</span>, <span class='ident'>err</span>), <span class='string'>"Two"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>err</span>.<span class='ident'>description</span>(), <span class='string'>"Two"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>err</span>.<span class='ident'>cause</span>().<span class='ident'>is_none</span>());
}
<span class='macro'>quick_error</span><span class='macro'>!</span> {
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>IoWrapper</span> {
<span class='ident'>Io</span>(<span class='ident'>err</span>: <span class='ident'>io</span>::<span class='ident'>Error</span>) {
<span class='ident'>from</span>()
<span class='ident'>description</span>(<span class='ident'>err</span>.<span class='ident'>description</span>())
<span class='ident'>display</span>(<span class='string'>"I/O error: {}"</span>, <span class='ident'>err</span>)
<span class='ident'>cause</span>(<span class='ident'>err</span>)
}
<span class='ident'>Other</span>(<span class='ident'>descr</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>) {
<span class='ident'>description</span>(<span class='ident'>descr</span>)
<span class='ident'>display</span>(<span class='string'>"Error: {}"</span>, <span class='ident'>descr</span>)
}
<span class='ident'>IoAt</span>(<span class='ident'>place</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>, <span class='ident'>err</span>: <span class='ident'>io</span>::<span class='ident'>Error</span>) {
<span class='ident'>cause</span>(<span class='ident'>err</span>)
<span class='ident'>display</span>(<span class='string'>"Error at {}: {}"</span>, <span class='ident'>place</span>, <span class='ident'>err</span>)
<span class='ident'>description</span>(<span class='string'>"io error at"</span>)
<span class='ident'>from</span>(<span class='ident'>s</span>: <span class='ident'>String</span>) <span class='op'>-></span> (<span class='string'>"idea"</span>,
<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>new</span>(<span class='ident'>io</span>::<span class='ident'>ErrorKind</span>::<span class='ident'>Other</span>, <span class='ident'>s</span>))
}
<span class='ident'>Discard</span> {
<span class='ident'>from</span>(<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>)
}
}
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>io_wrapper_err</span>() {
<span class='kw'>let</span> <span class='ident'>io1</span> <span class='op'>=</span> <span class='ident'>IoWrapper</span>::<span class='ident'>Io</span>(
<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>new</span>(<span class='ident'>io</span>::<span class='ident'>ErrorKind</span>::<span class='ident'>Other</span>, <span class='string'>"some error"</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>io1</span>), <span class='string'>"I/O error: some error"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{:?}"</span>, <span class='ident'>io1</span>),
<span class='string'>"Io(Error { repr: Custom(Custom { kind: Other, \
error: StringError(\"some error\") }) })"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>io1</span>.<span class='ident'>description</span>(), <span class='string'>"some error"</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>io1</span>.<span class='ident'>cause</span>().<span class='ident'>unwrap</span>().<span class='ident'>description</span>(), <span class='string'>"some error"</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>io_wrapper_trait_str</span>() {
<span class='kw'>let</span> <span class='ident'>err</span>: <span class='kw-2'>&</span><span class='ident'>Error</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='ident'>IoWrapper</span>::<span class='ident'>Other</span>(<span class='string'>"hello"</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>err</span>), <span class='string'>"Error: hello"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{:?}"</span>, <span class='ident'>err</span>), <span class='string'>"Other(\"hello\")"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>err</span>.<span class='ident'>description</span>(), <span class='string'>"hello"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>err</span>.<span class='ident'>cause</span>().<span class='ident'>is_none</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>io_wrapper_trait_two_fields</span>() {
<span class='kw'>let</span> <span class='ident'>io1</span> <span class='op'>=</span> <span class='ident'>IoWrapper</span>::<span class='ident'>Io</span>(
<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>new</span>(<span class='ident'>io</span>::<span class='ident'>ErrorKind</span>::<span class='ident'>Other</span>, <span class='string'>"some error"</span>));
<span class='kw'>let</span> <span class='ident'>err</span>: <span class='kw-2'>&</span><span class='ident'>Error</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='ident'>IoWrapper</span>::<span class='ident'>IoAt</span>(<span class='string'>"file"</span>,
<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>new</span>(<span class='ident'>io</span>::<span class='ident'>ErrorKind</span>::<span class='ident'>NotFound</span>, <span class='ident'>io1</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>err</span>),
<span class='string'>"Error at file: I/O error: some error"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{:?}"</span>, <span class='ident'>err</span>), <span class='string'>"IoAt(\"file\", Error { \
repr: Custom(Custom { kind: NotFound, \
error: Io(Error { repr: Custom(Custom { \
kind: Other, error: StringError(\"some error\") \
}) }) }) })"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>err</span>.<span class='ident'>description</span>(), <span class='string'>"io error at"</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>err</span>.<span class='ident'>cause</span>().<span class='ident'>unwrap</span>().<span class='ident'>description</span>(), <span class='string'>"some error"</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>io_wrapper_from</span>() {
<span class='kw'>let</span> <span class='ident'>io1</span>: <span class='ident'>IoWrapper</span> <span class='op'>=</span> <span class='ident'>From</span>::<span class='ident'>from</span>(<span class='ident'>io</span>::<span class='ident'>Error</span>::<span class='ident'>from_raw_os_error</span>(<span class='number'>2</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>io1</span>),
<span class='string'>"I/O error: No such file or directory (os error 2)"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>io1</span>.<span class='ident'>cause</span>().<span class='ident'>unwrap</span>().<span class='ident'>description</span>(), <span class='string'>"os error"</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>io_wrapper_custom_from</span>() {
<span class='kw'>let</span> <span class='ident'>io1</span>: <span class='ident'>IoWrapper</span> <span class='op'>=</span> <span class='ident'>From</span>::<span class='ident'>from</span>(<span class='string'>"Stringy"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>io1</span>), <span class='string'>"Error at idea: Stringy"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>io1</span>.<span class='ident'>cause</span>().<span class='ident'>unwrap</span>().<span class='ident'>description</span>(), <span class='string'>"Stringy"</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>io_wrapper_discard</span>() {
<span class='kw'>let</span> <span class='ident'>io1</span>: <span class='ident'>IoWrapper</span> <span class='op'>=</span> <span class='ident'>From</span>::<span class='ident'>from</span>(<span class='string'>"hello"</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>io1</span>), <span class='string'>"Discard"</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>io1</span>.<span class='ident'>cause</span>().<span class='ident'>is_none</span>());
}
}
</pre>
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