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