try_match.rs

/// 
/// ## Examples
/// ```
/// enum Foo {
///     Path(String),
///     Count(usize),
/// }
/// let foo = Foo::Path(1);
/// let f: Option<String> = try_match!(foo, Foo::Path(x)=> x);
/// ```
macro_rules! try_match {
    ($expression:expr, $( $pattern:pat_param )|+ $( if $guard: expr )? => $out: expr) => {
        match $expression {
            $( $pattern )|+ $( if $guard )? => ::core::option::Option::Some($out),
            _ => ::core::option::Option::None,
        }
    };
}