src/test/ui/issues/issue-20616-8.stderr

error: expected one of `#`, `>`, `const`, identifier, or lifetime, found `,`
  --> $DIR/issue-20616-8.rs:31:16
   |
LL | type Type_8<'a,,> = &'a ();
   |                ^ expected one of `#`, `>`, `const`, identifier, or lifetime

error: aborting due to previous error