warning: trailing semicolon in macro used in expression position
  --> $DIR/semicolon-in-expressions-from-macros.rs:9:13
   |
LL |         true;
   |             ^
...
LL |         foo!(warn_in_block)
   |         ------------------- in this macro invocation
   |
note: the lint level is defined here
  --> $DIR/semicolon-in-expressions-from-macros.rs:4:9
   |
LL | #![warn(semicolon_in_expressions_from_macros)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = 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 `foo`
   = note: this warning originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: trailing semicolon in macro used in expression position
  --> $DIR/semicolon-in-expressions-from-macros.rs:9:13
   |
LL |         true;
   |             ^
...
LL |     let _ = foo!(warn_in_expr);
   |             ------------------ 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: this warning originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: trailing semicolon in macro used in expression position
  --> $DIR/semicolon-in-expressions-from-macros.rs:9:13
   |
LL |         true;
   |             ^
...
LL |     let _ = #[allow(semicolon_in_expressions_from_macros)] foo!(allow_does_not_work);
   |                                                            ------------------------- 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: this warning originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: 3 warnings emitted