src/test/ui/parser/issue-17904.stderr

error: expected one of `:`, `==`, or `=`, found `;`
  --> $DIR/issue-17904.rs:4:33
   |
LL | struct Foo<T> where T: Copy, (T);
   |                                 ^ expected one of `:`, `==`, or `=`

error: aborting due to previous error