warning: trailing semicolon in macro used in expression position
  --> $DIR/lint-trailing-macro-call.rs:9:25
   |
LL |         #[cfg(false)] 25;
   |                         ^
...
LL |     expand_it!()
   |     ------------ in this macro invocation
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
   = note: macro invocations at the end of a block are treated as expressions
   = note: to ignore the value produced by the macro, add a semicolon after the invocation of `expand_it`
   = note: `#[warn(semicolon_in_expressions_from_macros)]` on by default
   = note: this warning originates in the macro `expand_it` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: 1 warning emitted

Future incompatibility report: Future breakage diagnostic:
warning: trailing semicolon in macro used in expression position
  --> $DIR/lint-trailing-macro-call.rs:9:25
   |
LL |         #[cfg(false)] 25;
   |                         ^
...
LL |     expand_it!()
   |     ------------ in this macro invocation
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
   = note: macro invocations at the end of a block are treated as expressions
   = note: to ignore the value produced by the macro, add a semicolon after the invocation of `expand_it`
   = note: `#[warn(semicolon_in_expressions_from_macros)]` on by default
   = note: this warning originates in the macro `expand_it` (in Nightly builds, run with -Z macro-backtrace for more info)