2 Checks for structure field patterns bound to wildcards.
5 Using `..` instead is shorter and leaves the focus on
6 the fields that are actually bound.
10 let f = Foo { a: 0, b: 0, c: 0 };
13 Foo { a: _, b: 0, .. } => {},
14 Foo { a: _, b: _, c: _ } => {},
20 let f = Foo { a: 0, b: 0, c: 0 };
23 Foo { b: 0, .. } => {},