Bug with comprehension inlining + type aliases

[JelleZijlstra]

Consider this code:

class C:
 T = "class"
 type Alias3[T] = (T for _ in (1,))
 type Alias5[T] = [T for _ in (1,)]

print(list(C.Alias3.__value__))
print(C.Alias5.__value__)

On current main it produces:

[T]
['class']

So if you use a genexp, you get the T type parameter, but if you use a listcomp, you get the class variable. I think the genexp behavior is right; the comprehension should never see the class scope.

Found this while looking into #109118. Filing this separately as the symptom is different, but I suspect we'll have to solve both simultaneously. cc @carljm for PEP 709.