Refactor test to work with python 3.10/3.11, and 3.12+

Author: a12k

test-data/unit/check-typevar-tuple.test

@@ -2756,18 +2756,21 @@ def c(t: X[Concatenate[int, ...]]) -> None:  # E: Cannot use "[int, VarArg(Any),
 [builtins fixtures/tuple.pyi]
 
 [case testTypeVarTupleLiteralValueAsTypeArgument]
-# flags: --python-version 3.12
-from typing import TypeVarTuple, Generic, Unpack
+from typing import TypeVarTuple, Generic, Unpack, Callable, TypeVar
 
 Ts = TypeVarTuple('Ts')
+T = TypeVar('T')
 
-def fn[*T]() -> None:
-    pass
-
-class C(Generic[*Ts]):
+class C(Generic[Unpack[Ts]]):
     pass
 
 x = C[1, 2, 3]() # E: Invalid type: try using Literal[1] instead? \
                  # E: Invalid type: try using Literal[2] instead? \
                  # E: Invalid type: try using Literal[3] instead?
+
+def func(d: Callable[[Unpack[Ts]], T]) -> T: ...
+
+y = func[1, int] # E: Type application is only supported for generic classes \
+                 # E: Invalid type argument: type expected, for Any \
+                 # E: Invalid type: try using Literal[1] instead?
 [builtins fixtures/tuple.pyi]