simplify the function signature of parse_config_file, which did not even use stdout anyway

Author: wyattscarpenter

mypy/config_parser.py

@@ -314,7 +314,6 @@ def parse_config_file(
     options: Options,
     set_strict_flags: Callable[[], None],
     filename: str | None,
-    stdout: TextIO | None = None,
     stderr: TextIO | None = None,
 ) -> None:
     """Parse a config file into an Options object.
@@ -323,7 +322,6 @@ def parse_config_file(
 
     If filename is None, fall back to default config files.
     """
-    stdout = stdout or sys.stdout
     stderr = stderr or sys.stderr
 
     ret = (

mypy/main.py

@@ -1379,7 +1379,7 @@ def set_strict_flags() -> None:
             setattr(options, dest, value)
 
     # Parse config file first, so command line can override.
-    parse_config_file(options, set_strict_flags, config_file, stdout, stderr)
+    parse_config_file(options, set_strict_flags, config_file, stderr)
 
     # Set strict flags before parsing (if strict mode enabled), so other command
     # line options can override.

mypy/stubtest.py

@@ -2016,7 +2016,7 @@ def test_stubs(args: _Arguments, use_builtins_fixtures: bool = False) -> int:
         def set_strict_flags() -> None:  # not needed yet
             return
 
-        parse_config_file(options, set_strict_flags, options.config_file, sys.stdout, sys.stderr)
+        parse_config_file(options, set_strict_flags, options.config_file, sys.stderr)
 
     def error_callback(msg: str) -> typing.NoReturn:
         print(_style("error:", color="red", bold=True), msg)