1const E = enum(u8) {
 2    a,
 3    b,
 4    _,
 5};
 6
 7export fn f(e: E) void {
 8    switch (e) {
 9        .a, .b, _ => {},
10        else => {},
11    }
12}
13
14// error
15//
16// :10:14: error: unreachable else prong; all explicit cases already handled