[3.11] gh-94430: Allow params named `module` or `self` with custom C names in AC (GH-94431) (#94649)

(cherry picked from commit 8bbd70b4d130f060f87e3f53810dc747a49fa369)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@protonmail.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/Tools/clinic/clinic.py b/Tools/clinic/clinic.py
index 791d434..cd0446d 100755
--- a/Tools/clinic/clinic.py
+++ b/Tools/clinic/clinic.py
@@ -4721,9 +4721,14 @@ class DSLParser:
 
         p = Parameter(parameter_name, kind, function=self.function, converter=converter, default=value, group=self.group)
 
-        if parameter_name in self.function.parameters:
+        names = [k.name for k in self.function.parameters.values()]
+        if parameter_name in names[1:]:
             fail("You can't have two parameters named " + repr(parameter_name) + "!")
-        self.function.parameters[parameter_name] = p
+        elif names and parameter_name == names[0] and c_name is None:
+            fail(f"Parameter '{parameter_name}' requires a custom C name")
+
+        key = f"{parameter_name}_as_{c_name}" if c_name else parameter_name
+        self.function.parameters[key] = p
 
     def parse_converter(self, annotation):
         if (hasattr(ast, 'Constant') and