Name

        pub const Name = enum(u32) {
            @"comptime" = std.math.maxInt(u32),
            unnamed_test = std.math.maxInt(u32) - 1,
            /// Other values are `NullTerminatedString` values, i.e. index into
            /// `string_bytes`. If the byte referenced is 0, the decl is a named
            /// test, and the actual name begins at the following byte.
            _,

            pub fn isNamedTest(name: Name, zir: Zir) bool {
                return switch (name) {
                    .@"comptime", .unnamed_test => false,
                    _ => zir.string_bytes[@backingInt(name)] == 0,
                };
            }
            pub fn toString(name: Name, zir: Zir) ?NullTerminatedString {
                switch (name) {
                    .@"comptime", .unnamed_test => return null,
                    _ => {},
                }
                const idx: u32 = @backingInt(name);
                if (zir.string_bytes[idx] == 0) {
                    // Named test
                    return @fromBackingInt(@intCast(idx + 1));
                }
                return @fromBackingInt(@intCast(idx));
            }
        }