error: underscore literal suffix is not allowed
  --> $DIR/underscore-suffix-for-string.rs:6:18
   |
LL |     let _ = "Foo"_;
   |                  ^

error: underscore literal suffix is not allowed
  --> $DIR/underscore-suffix-for-string.rs:15:16
   |
LL |     sink!("Foo"_);
   |                ^

error: aborting due to 2 previous errors