quick-error 0.1.2

A macro which makes error types pleasant to write.
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<h1 class='fqn'><span class='in-band'><a href='index.html'>lib</a>::<wbr><a class='macro' href=''>quick_error!</a></span><span class='out-of-band'><span id='render-detail'>
            <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
                [<span class='inner'>&#x2212;</span>]
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        </span><a id='src-176' class='srclink' href='../src/lib/lib.rs.html#165-435' title='goto source code'>[src]</a></span></h1>
<pre class='rust macro'>
<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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>&amp;</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&amp;</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'>-&gt;</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> {
                    $(
                        <span class='kw-2'>&amp;</span><span class='macro-nonterminal'>$</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'>=&gt;</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'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>str</span> {
                <span class='kw'>match</span> <span class='self'>self</span> {
                    $(
                        <span class='kw-2'>&amp;</span><span class='macro-nonterminal'>$</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'>=&gt;</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'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span>::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span><span class='op'>&gt;</span> {
                <span class='kw'>match</span> <span class='self'>self</span> {
                    $(
                        <span class='kw-2'>&amp;</span><span class='macro-nonterminal'>$</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</span> {
        <span class='macro'>write</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>fmt</span>, <span class='string'>&quot;{}&quot;</span>, ::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span>::<span class='ident'>description</span>(<span class='macro-nonterminal'>$</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</span> {
        $( $(
            <span class='kw'>impl</span> <span class='ident'>From</span><span class='op'>&lt;</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>typ</span><span class='op'>&gt;</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'>$</span><span class='macro-nonterminal'>typ</span>) <span class='op'>-&gt;</span> <span class='macro-nonterminal'>$</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'>=&gt;</span> {
        <span class='kw'>impl</span> <span class='ident'>From</span><span class='op'>&lt;</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</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'>$</span><span class='macro-nonterminal'>ftyp</span>) <span class='op'>-&gt;</span> <span class='macro-nonterminal'>$</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'>$</span><span class='macro-nonterminal'>ftyp</span>:<span class='ident'>ty</span>) <span class='op'>-&gt;</span> ($(<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'>=&gt;</span> {
        <span class='kw'>impl</span> <span class='ident'>From</span><span class='op'>&lt;</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ftyp</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</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'>-&gt;</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'>=&gt;</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'>$</span><span class='macro-nonterminal'>typ</span>:<span class='ident'>ty</span>)<span class='op'>*</span> ) )<span class='op'>*</span> ]
        { }
    ) <span class='op'>=&gt;</span> {
    };
    <span class='comment'>// This one should match all allowed sequences in &quot;funcs&quot; but not match</span>
    <span class='comment'>// anything else.</span>
    <span class='comment'>// This is to contrast FIND_* clauses which just find stuff they need and</span>
    <span class='comment'>// skip everything else completely</span>
    (<span class='ident'>ERROR_CHECK</span> <span class='ident'>display</span>($(<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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>=&gt;</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'>-&gt;</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'>=&gt;</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'>=&gt;</span> {};
}</pre>
<div class='docblock'><p>Main macro that does all the work</p>
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