[BUG] Parser crash when using struct member alias without specifying struct parameter

[DayDun]

Bug Description

@value
@register_passable
struct Struct[n: Int]:
    alias Alias = Struct[1]()

alias x = Struct.Alias

error: The Mojo REPL has crashed and attempted recovery. If the REPL behaves inconsistently, please restart to ensure correct behavior.

Does not crash if you specify Struct[1].Alias.

Expected behavior would be to either emit an error indicating that a parameter needs to be specified. Or maybe allow no parameters if the alias doesn't depend on any?

[Mogball]

Thanks for filing! This looks like a parser verification hole. The code you've shared should throw an error instead of crashing.