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#[macro_export]
macro_rules! error_defs {
($(error $type_name:ident$(<$($generic:ident$(: $bound:ident$( + $extra_bound_base:ident$(::$extra_bound_more:ident)*)*)*),*>)* {
$($variant_name:ident $({$($memb_id:ident $(#[$memb_attr:ident])*: $memb_ty:ty),*})*
=> $short:tt $(($long:tt $(, $long_arg:expr)*))*,)*
})*) => {
$(
pub enum $type_name$(<$($generic$(: $bound$( + $extra_bound_base$(::$extra_bound_more)*)*)*),*>)* {
$(
$variant_name $({$($memb_id: $memb_ty),*})*
,)*
}
impl$(<$($generic: ::std::any::Any + ::std::fmt::Debug$( + $bound$( + $extra_bound_base$(::$extra_bound_more)*)*)*),*>)* ::std::fmt::Debug for $type_name$(<$($generic),*>)* {
#[allow(unused_variables)]
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
match self {
$(&$type_name::$variant_name $({$(ref $memb_id),*})* => {
try!(f.debug_struct(stringify!($variant_name))$($(.field(stringify!($memb_id), $memb_id))*)*.finish());
try!(write!(f, " /* {} */", self));
}),*
}
Ok(())
}
}
impl$(<$($generic: ::std::any::Any + ::std::fmt::Debug$( + $bound$( + $extra_bound_base$(::$extra_bound_more)*)*)*),*>)* ::std::fmt::Display for $type_name$(<$($generic),*>)* {
#[allow(unused_variables)]
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
match self {
$(&$type_name::$variant_name $({$(ref $memb_id),*})* => {
use ::std::error::Error;
try!(write!(f, $short));
$(try!(write!(f, concat!(". ", $long) $(, $long_arg)*));)*
if let Some(e) = self.cause() {
try!(write!(f, " {}", e));
}
}),*
}
Ok(())
}
}
impl$(<$($generic: ::std::any::Any + ::std::fmt::Debug$( + $bound$( + $extra_bound_base$(::$extra_bound_more)*)*)*),*>)* ::std::error::Error for $type_name$(<$($generic),*>)* {
#[allow(unused_variables)]
fn description(&self) -> &str {
match self {
$(&$type_name::$variant_name $({$(ref $memb_id),*})* => concat!($short)),*
}
}
#[allow(unused_variables, unreachable_code)]
fn cause(&self) -> Option<&::std::error::Error> {
match self {
$(&$type_name::$variant_name $({$(ref $memb_id),*})* => {
$($($(
let $memb_attr = {
let ret: &$memb_ty = $memb_id;
return Some(ret)
};
)*)*)*
None
}),*
}
}
}
)*
}
}