1 error: expected one of `>`, const, identifier, lifetime, or type, found `,`
2 --> $DIR/issue-20616-5.rs:22:34
4 LL | type Type_5<'a> = Type_1_<'a, (),,>;
5 | ^ expected one of `>`, const, identifier, lifetime, or type here
7 error: aborting due to previous error