Macro try_match::try_match

macro_rules! try_match {
    ($in:expr, $(|)? $($p:pat)|+ $(if $guard:expr)? => $out:expr $(,)?) => { ... };
    ($in:expr, $(|)? $($p:pat)|+ $(if $guard:expr)? $(,)?) => { ... };
    (, $($pattern_and_rest:tt)*) => { ... };
}

Try to match $in against a given pattern $p. Produces Ok($out) if successful; Err($in) otherwise.

try_match!($( $in:expr )?, $p:pat_multi $( if $guard:expr )? $( => $out:expr )? $( , )?)

=> $out can be left out, in which case it’s implied based on the number of bound variables in $p:

• If there are no bound variables, it is implied to be ().
• If there is exactly one bound variable var, it is implied to be var.
• If there are multiple bound variables var1, var2, ..., it is implied to be AnonymousType { var1, var2 }.

AnonymousType implements Clone, Copy, and Debug.

$in can be left out to produce a closure (partial application).

See the crate-level documentation for examples.