1 error: where clauses are not allowed before tuple struct bodies
2 --> $DIR/issue-17904.rs:6:15
4 LL | struct Foo<T> where T: Copy, (T);
5 | --- ^^^^^^^^^^^^^^ --- the struct body
7 | | unexpected where clause
8 | while parsing this tuple struct
10 help: move the body before the where clause
12 LL - struct Foo<T> where T: Copy, (T);
13 LL + struct Foo<T>(T) where T: Copy;
16 error: aborting due to previous error