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macro_rules! impl_display {
($enum:ident<$lt:lifetime>, {$($variant:pat => $fmt_string:expr),+$(,)* }) => {
impl<$lt> ::std::fmt::Display for $enum<$lt> {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
use self::$enum::*;
match &self {
$(
$variant => write!(f, "{}", $fmt_string),
)+
}
}
}
};
($enum:ident, {$($variant:pat => $fmt_string:expr),+$(,)* }) => {
impl ::std::fmt::Display for $enum {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
use self::$enum::*;
match &self {
$(
$variant => write!(f, "{}", $fmt_string),
)+
}
}
}
};
}
macro_rules! impl_debug_as_display {
($enum:ident<$lt:lifetime>) => {
impl<$lt> ::std::fmt::Debug for $enum<$lt> {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
write!(f, "{}", self)
}
}
};
($enum:ident) => {
impl ::std::fmt::Debug for $enum {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
write!(f, "{}", self)
}
}
};
}
macro_rules! impl_from {
($a:ident<$c:lifetime>, $b:ident::$enum_type:ident) => {
impl<$c> From<$a<$c>> for $b<$c> {
fn from(e: $a<$c>) -> Self {
$b::$enum_type(e)
}
}
};
($a:ident, $b:ident::$enum_type:ident) => {
impl From<$a> for $b {
fn from(e: $a) -> Self {
$b::$enum_type(e)
}
}
};
}