1 error: expected one of `>`, a const expression, lifetime, or type, found `,`
2 --> $DIR/issue-20616-6.rs:25:26
4 LL | type Type_6 = Type_5_<'a,,>;
5 | ^ expected one of `>`, a const expression, lifetime, or type
7 help: you might have meant to end the type parameters here
9 LL | type Type_6 = Type_5_<'a>,,>;
12 error: aborting due to previous error