typechecker misses undeclared type in right-hand side of alias definition

[jurgenvinju]

Describe the bug

I had an empty module with this in it:

data AType = \int();
alias TypeProvider = AType(Tree); // Generic

The type-checker did not report an undefined type for Tree, but the interpreter complained on import.

[jurgenvinju]

However, when changing Tree to X, then the typechecker complaints rightfully. So perhaps this is not a bug.

[PaulKlint]

In the upcoming release, the typechecker now correctly reports Tree as undefined. Thanks for reporting.