error: macro expansion ignores token `assert_eq` and any following
  --> $DIR/macro-in-expression-context.rs:6:9
   |
LL |         assert_eq!("B", "B");
   |         ^^^^^^^^^
...
LL |     foo!()
   |     ------- help: you might be missing a semicolon here: `;`
   |     |
   |     caused by the macro expansion here
   |
   = note: the usage of `foo!` is likely invalid in expression context

error: aborting due to previous error