fix python#16935 use builtins.type not ABCMeta as tuple type obj fall…

…back

i.e. the mypy type of the expression union[str, int] is a
CallableType with fallback builtins.type

this matches the mypy type of the expression int
which is a CallableType with fallback builtins.type

(suggested by PR review discussion)

mypy/checkexpr.py

@@ -4846,7 +4846,7 @@ def apply_type_arguments_to_callable(
                         [ARG_POS],
                         ["p1"],
                         TupleType(list(args), self.chk.named_type("tuple")),
-                        self.chk.named_type("abc.ABCMeta"),
+                        self.chk.named_type("builtins.type"),
                         name="tuple",
                         definition=tp.definition,
                         bound_args=tp.bound_args,

test-data/unit/check-incremental.test

@@ -3696,8 +3696,8 @@ cache_fine_grained = False
 [file mypy.ini.2]
 \[mypy]
 cache_fine_grained = True
-[rechecked _typeshed, a, abc, builtins, typing]
-[stale _typeshed, a, abc, builtins, typing]
+[rechecked _typeshed, a, builtins, typing]
+[stale _typeshed, a, builtins, typing]
 [builtins fixtures/tuple.pyi]
 
 [case testIncrementalPackageNameOverload]
@@ -3748,8 +3748,8 @@ Signature: 8a477f597d28d172789f06886806bc55
 [file b.py.2]
 # uh
 -- Every file should get reloaded, since the cache was invalidated
-[stale _typeshed, a, abc, b, builtins, typing]
-[rechecked _typeshed, a, abc, b, builtins, typing]
+[stale _typeshed, a, b, builtins, typing]
+[rechecked _typeshed, a, b, builtins, typing]
 [builtins fixtures/tuple.pyi]
 
 [case testIncrementalBustedFineGrainedCache2]
@@ -3761,8 +3761,8 @@ import b
 [file b.py.2]
 # uh
 -- Every file should get reloaded, since the settings changed
-[stale _typeshed, a, abc, b, builtins, typing]
-[rechecked _typeshed, a, abc, b, builtins, typing]
+[stale _typeshed, a, b, builtins, typing]
+[rechecked _typeshed, a, b, builtins, typing]
 [builtins fixtures/tuple.pyi]
 
 [case testIncrementalBustedFineGrainedCache3]
@@ -3777,8 +3777,8 @@ import b
 [file b.py.2]
 # uh
 -- Every file should get reloaded, since the cache was invalidated
-[stale _typeshed, a, abc, b, builtins, typing]
-[rechecked _typeshed, a, abc, b, builtins, typing]
+[stale _typeshed, a, b, builtins, typing]
+[rechecked _typeshed, a, b, builtins, typing]
 [builtins fixtures/tuple.pyi]
 
 [case testIncrementalWorkingFineGrainedCache]

test-data/unit/fixtures/tuple.pyi

@@ -2,7 +2,6 @@
 
 import _typeshed
 from typing import Iterable, Iterator, TypeVar, Generic, Sequence, Optional, overload, Tuple, Type
-from abc import ABCMeta
 
 T = TypeVar("T")
 Tco = TypeVar('Tco', covariant=True)