src/test/ui/str/str-as-char.stderr

error: character literal may only contain one codepoint
  --> $DIR/str-as-char.rs:4:14
   |
LL |     println!('●●');
   |              ^^^^
   |
help: if you meant to write a `str` literal, use double quotes
   |
LL |     println!("●●");
   |              ^^^^

error: aborting due to previous error