error: no rules expected the token `_`
 --> tests/compile-fail/reserved/try_match_scrutinee_placeholder.rs:4:35
  |
4 |     let _ = try_match::try_match!(_, Some(_0))(Some(42));
  |                                   ^ no rules expected this token in macro call
  |
note: while trying to match meta-variable `$r#in:expr`
 --> src/lib.rs
  |
  |     ($in:expr, $p:pat $(if $guard:expr)? => $out:expr $(,)?) => {
  |      ^^^^^^^^