error: expected expression, found keyword `struct`
  --> $DIR/issue-34421-mac-expr-bad-stmt-good-add-semi.rs:3:9
   |
LL |         struct $a;
   |         ^^^^^^ expected expression
...
LL |     make_item!(A)
   |     ------------- in this macro invocation
   |
   = note: the macro call doesn't expand to an expression, but it can expand to a statement
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
help: add `;` to interpret the expansion as a statement
   |
LL |     make_item!(A);
   |                  ^

error: expected expression, found keyword `struct`
  --> $DIR/issue-34421-mac-expr-bad-stmt-good-add-semi.rs:3:9
   |
LL |         struct $a;
   |         ^^^^^^ expected expression
...
LL |     make_item!(B)
   |     ------------- in this macro invocation
   |
   = note: the macro call doesn't expand to an expression, but it can expand to a statement
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
help: add `;` to interpret the expansion as a statement
   |
LL |     make_item!(B);
   |                  ^

error: aborting due to 2 previous errors