[BUG] "use of unknown declaration" on misuse of @nonmaterializable

[oskgo]

Bug description

Using @nonmaterializable(T) with certain T emits the error: "use of unknown declaration 'nonmaterializable'" when it shouldn't.

Steps to reproduce

Case where the error shouldn't be emitted because we already get an error for the cause (the nonexistent type):

@nonmaterializable(nonexistenttype)
struct Bar:
    pass

Case where a different error should be emitted (unless this should be supported?):

struct Foo[T: AnyType]:
    pass

@nonmaterializable(Foo[Int])
struct Bar:
    pass

System information

- Ubuntu in WSL
- mojo 2024.5.2605 (9c328b12)
- modular 0.8.0 (39a426b5)