@Type(.Enum) with invalid tag_type causes segfault and invalid behaviour

[Snektron]

The following example causes the compiler to crash:

const builtin = @import("builtin");

export fn a() void {
    const enum_info = .{
        .layout = .Auto,
        .tag_type = struct {x: u32},
        .fields = &[_]builtin.TypeInfo.EnumField{
            .{.name = "python", .value = 10},
            .{.name = "cobra", .value = 20},
        },
        .decls = &[_]builtin.TypeInfo.Declaration{},
        .is_exhaustive = false,
    };
    const X = @Type(.{.Enum = enum_info});   

    @compileLog(X.python); 
}

The following doesn't crash, but @enumToInt returns zero:

const builtin = @import("builtin");

export fn a() void {
    const enum_info = .{
        .layout = .Auto,
        .tag_type = comptime_int,
        .fields = &[_]builtin.TypeInfo.EnumField{
            .{.name = "python", .value = 10},
            .{.name = "cobra", .value = 20},
        },
        .decls = &[_]builtin.TypeInfo.Declaration{},
        .is_exhaustive = false,
    };
    const X = @Type(.{.Enum = enum_info});   

    @compileLog(@intToEnum(X.python)); 
}

I suppose there should be some guard on tag_type internally. I haven't tested the other @Type variants.