warning: expected `;`, found keyword `let`
  --> $DIR/missing-semicolon-warning.rs:6:12
   |
LL |         $( let x = $e1 )*;
   |            ^^^
...
LL | fn main() { m!(0, 0; 0, 0); }
   |             --------------- in this macro invocation
   |
   = note: this was erroneously allowed and will become a hard error in a future release
   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

warning: expected `;`, found `println`
  --> $DIR/missing-semicolon-warning.rs:7:12
   |
LL |         $( println!("{}", $e2) )*;
   |            ^^^^^^^
...
LL | fn main() { m!(0, 0; 0, 0); }
   |             --------------- in this macro invocation
   |
   = note: this was erroneously allowed and will become a hard error in a future release
   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)