src/test/ui/empty/empty-comment.rs

   1 // `/**/` was previously regarded as a doc comment because it starts with `/**` and ends with `*/`.
   2 // This could break some internal logic that assumes the length of a doc comment is at least 5,
   3 // leading to an ICE.
   4
   5 macro_rules! one_arg_macro {
   6     ($fmt:expr) => (print!(concat!($fmt, "\n")));
   7 }
   8
   9 fn main() {
  10     one_arg_macro!(/**/); //~ ERROR unexpected end
  11 }