Ignore types for arg and kwarg, in case user function uses a parameter with name "arg"

Author: Otto-AA

src/mutmut/file_mutation.py

@@ -316,12 +316,14 @@ def _get_local_name(func_name: str) -> cst.BaseExpression:
             # return await _mutmut_trampoline(...)
             result_statement = cst.SimpleStatementLine([cst.Return(cst.Await(result))])
 
+    type_ignore_whitespace = cst.TrailingWhitespace(comment=cst.Comment('# type: ignore'))
+
     function.whitespace_after_type_parameters
     return function.with_changes(
         body=cst.IndentedBlock(
             [
-                cst.SimpleStatementLine([args_assignemnt]),
-                cst.SimpleStatementLine([kwargs_assignment]),
+                cst.SimpleStatementLine([args_assignemnt], trailing_whitespace=type_ignore_whitespace),
+                cst.SimpleStatementLine([kwargs_assignment], trailing_whitespace=type_ignore_whitespace),
                 result_statement,
             ],
         ),

tests/test_mutation regression.py

@@ -19,8 +19,8 @@ def test_create_trampoline_wrapper_async_method():
 
     assert _get_trampoline_wrapper(source, "x_foo__mutmut") == snapshot("""\
 async def foo(a: str, b, *args, **kwargs) -> dict[str, int]:
-    args = [a, b, *args]
-    kwargs = {**kwargs}
+    args = [a, b, *args]# type: ignore
+    kwargs = {**kwargs}# type: ignore
     return await _mutmut_trampoline(x_foo__mutmut_orig, x_foo__mutmut_mutants, args, kwargs, None)\
 """)
 
@@ -34,8 +34,8 @@ async def foo():
 
     assert _get_trampoline_wrapper(source, "x_foo__mutmut") == snapshot("""\
 async def foo():
-    args = []
-    kwargs = {}
+    args = []# type: ignore
+    kwargs = {}# type: ignore
     async for i in _mutmut_trampoline(x_foo__mutmut_orig, x_foo__mutmut_mutants, args, kwargs, None):
         yield i\
 """)
@@ -46,8 +46,8 @@ def test_create_trampoline_wrapper_with_positionals_only_args():
 
     assert _get_trampoline_wrapper(source, "x_foo__mutmut") == snapshot("""\
 def foo(p1, p2=None, /, p_or_kw=None, *, kw):
-    args = [p1, p2, p_or_kw]
-    kwargs = {'kw': kw}
+    args = [p1, p2, p_or_kw]# type: ignore
+    kwargs = {'kw': kw}# type: ignore
     return _mutmut_trampoline(x_foo__mutmut_orig, x_foo__mutmut_mutants, args, kwargs, None)\
 """)
 
@@ -59,8 +59,8 @@ def test_create_trampoline_wrapper_for_class_method():
         source, "x_foo__mutmut", class_name="Person"
     ) == snapshot("""\
 def foo(self, a, b):
-    args = [a, b]
-    kwargs = {}
+    args = [a, b]# type: ignore
+    kwargs = {}# type: ignore
     return _mutmut_trampoline(object.__getattribute__(self, 'x_foo__mutmut_orig'), object.__getattribute__(self, 'x_foo__mutmut_mutants'), args, kwargs, self)\
 """)
 
@@ -137,8 +137,8 @@ def x_foo__mutmut_2(a: list[int], b):
     return a[0] >= b
 
 def foo(a: list[int], b):
-    args = [a, b]
-    kwargs = {}
+    args = [a, b]# type: ignore
+    kwargs = {}# type: ignore
     return _mutmut_trampoline(x_foo__mutmut_orig, x_foo__mutmut_mutants, args, kwargs, None)
 
 x_foo__mutmut_mutants : ClassVar[MutantDict] = { # type: ignore
@@ -154,8 +154,8 @@ def x_bar__mutmut_1():
     yield 2
 
 def bar():
-    args = []
-    kwargs = {}
+    args = []# type: ignore
+    kwargs = {}# type: ignore
     return _mutmut_trampoline(x_bar__mutmut_orig, x_bar__mutmut_mutants, args, kwargs, None)
 
 x_bar__mutmut_mutants : ClassVar[MutantDict] = { # type: ignore
@@ -169,8 +169,8 @@ def xǁAdderǁ__init____mutmut_orig(self, amount):
     def xǁAdderǁ__init____mutmut_1(self, amount):
         self.amount = None
     def __init__(self, amount):
-        args = [amount]
-        kwargs = {}
+        args = [amount]# type: ignore
+        kwargs = {}# type: ignore
         return _mutmut_trampoline(object.__getattribute__(self, 'xǁAdderǁ__init____mutmut_orig'), object.__getattribute__(self, 'xǁAdderǁ__init____mutmut_mutants'), args, kwargs, self)
     \n\
     xǁAdderǁ__init____mutmut_mutants : ClassVar[MutantDict] = { # type: ignore
@@ -185,8 +185,8 @@ def xǁAdderǁadd__mutmut_1(self, value):
         return self.amount - value
 
     def add(self, value):
-        args = [value]
-        kwargs = {}
+        args = [value]# type: ignore
+        kwargs = {}# type: ignore
         return _mutmut_trampoline(object.__getattribute__(self, 'xǁAdderǁadd__mutmut_orig'), object.__getattribute__(self, 'xǁAdderǁadd__mutmut_mutants'), args, kwargs, self)
     \n\
     xǁAdderǁadd__mutmut_mutants : ClassVar[MutantDict] = { # type: ignore