Use "parameter" instead of "argument" in overload error (#20994)

Fixes #20995

Author: hyperkai

mypy/checker.py

@@ -1018,7 +1018,7 @@ def check_overlapping_overloads(self, defn: OverloadedFuncDef) -> None:
                 if not is_callable_compatible(
                     impl, sig1, is_compat=is_subtype, is_proper_subtype=False, ignore_return=True
                 ):
-                    self.msg.overloaded_signatures_arg_specific(i + 1, defn.impl)
+                    self.msg.overloaded_signatures_param_specific(i + 1, defn.impl)
 
                 # Is the overload alternative's return type a subtype of the implementation's?
                 if not (

mypy/messages.py

@@ -1659,10 +1659,10 @@ def overloaded_signatures_typevar_specific(self, index: int, context: Context) -
             context,
         )
 
-    def overloaded_signatures_arg_specific(self, index: int, context: Context) -> None:
+    def overloaded_signatures_param_specific(self, index: int, context: Context) -> None:
         self.fail(
             (
-                f"Overloaded function implementation does not accept all possible arguments "
+                f"Overloaded function implementation does not accept all possible parameters "
                 f"of signature {index}"
             ),
             context,

test-data/unit/check-overloading.test

@@ -226,7 +226,7 @@ def f(x: 'A') -> 'B': ...
 @overload
 def f(x: 'B') -> 'A': ...
 
-def f(x: 'A') -> Any: # E: Overloaded function implementation does not accept all possible arguments of signature 2
+def f(x: 'A') -> Any: # E: Overloaded function implementation does not accept all possible parameters of signature 2
     pass
 
 reveal_type(f(A())) # N: Revealed type is "__main__.B"
@@ -271,7 +271,7 @@ from typing import overload
 @overload  # E: Single overload definition, multiple required
 def foo(x: int) -> None: ...
 
-def foo(*args: int, **kw: str) -> None:  # E: Overloaded function implementation does not accept all possible arguments of signature 1
+def foo(*args: int, **kw: str) -> None:  # E: Overloaded function implementation does not accept all possible parameters of signature 1
     pass
 [builtins fixtures/tuple.pyi]
 
@@ -4756,7 +4756,7 @@ def none_loose_impl(x: int) -> int: ...
 def none_loose_impl(x: int) -> int:
     return x
 [out]
-main:21: error: Overloaded function implementation does not accept all possible arguments of signature 1
+main:21: error: Overloaded function implementation does not accept all possible parameters of signature 1
 main:21: error: Overloaded function implementation cannot produce return type of signature 1
 
 [case testTooManyUnionsException]
@@ -5426,7 +5426,7 @@ def dec_c(f: Callable[..., Any]) -> C:
 def f_c(arg: int) -> None: ...
 @overload
 def f_c(arg: str) -> None: ...
-@dec_c  # E: Overloaded function implementation does not accept all possible arguments of signature 2
+@dec_c  # E: Overloaded function implementation does not accept all possible parameters of signature 2
 def f_c(arg): ...
 [builtins fixtures/dict.pyi]
 

test-data/unit/check-python38.test

@@ -566,7 +566,7 @@ class Foo:
     @overload
     def f(self, *, b: bool = False) -> None: ...
 
-    def f(self, a: Optional[str] = None, /, *, b: bool = False) -> None:  # E: Overloaded function implementation does not accept all possible arguments of signature 2
+    def f(self, a: Optional[str] = None, /, *, b: bool = False) -> None:  # E: Overloaded function implementation does not accept all possible parameters of signature 2
         ...
 
 class Bar:

test-data/unit/check-typeddict.test

@@ -3849,7 +3849,7 @@ def f(self, **kwargs: Unpack[TD]) -> None:
 def g(self, *, x: float) -> None: ...
 @overload
 def g(self, *, y: str) -> None: ...
-def g(self, **kwargs: Unpack[TD]) -> None:  # E: Overloaded function implementation does not accept all possible arguments of signature 1
+def g(self, **kwargs: Unpack[TD]) -> None:  # E: Overloaded function implementation does not accept all possible parameters of signature 1
     z  # E: Name "z" is not defined
 
 class A:

test-data/unit/fine-grained.test

@@ -7172,7 +7172,7 @@ class E:
     pass
 [out]
 ==
-main:8: error: Overloaded function implementation does not accept all possible arguments of signature 2
+main:8: error: Overloaded function implementation does not accept all possible parameters of signature 2
 main:8: error: Overloaded function implementation cannot produce return type of signature 2
 
 [case testOverloadsGenericTypevarUpdated]