1error: expected one of `#`, `>`, `const`, identifier, or lifetime, found `,`
2  --> $DIR/empty_generics.rs:4:14
3   |
4LL | trait Foo {
5   |           - while parsing this item list starting here
6LL |     type Bar<,>;
7   |              ^ expected one of `#`, `>`, `const`, identifier, or lifetime
8LL |
9LL | }
10   | - the item list ends here
11
12error: aborting due to previous error
13
14