gh-133436: Correct error messages that incorrectly use "arguments"

Grammar/python.gram

@@ -1319,11 +1319,11 @@ invalid_parameters:
 invalid_default:
     | a='=' &(')'|',') { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "expected default value expression") }
 invalid_star_etc:
-    | a='*' (')' | ',' (')' | '**')) { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "named arguments must follow bare *") }
+    | a='*' (')' | ',' (')' | '**')) { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "named parameters must follow bare *") }
     | '*' ',' TYPE_COMMENT { RAISE_SYNTAX_ERROR("bare * has associated type comment") }
     | '*' param a='=' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "var-positional argument cannot have default value") }
     | '*' (param_no_default | ',') param_maybe_default* a='*' (param_no_default | ',') {
-        RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "* argument may appear only once") }
+        RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "* marker may appear only once") }
 invalid_kwds:
     | '**' param a='=' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "var-keyword argument cannot have default value") }
     | '**' param ',' a=param { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "arguments cannot follow var-keyword argument") }
@@ -1348,7 +1348,7 @@ invalid_lambda_parameters_helper:
     | a=lambda_slash_with_default { _PyPegen_singleton_seq(p, a) }
     | lambda_param_with_default+
 invalid_lambda_star_etc:
-    | '*' (':' | ',' (':' | '**')) { RAISE_SYNTAX_ERROR("named arguments must follow bare *") }
+    | '*' (':' | ',' (':' | '**')) { RAISE_SYNTAX_ERROR("named parameters must follow bare *") }
     | '*' lambda_param a='=' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "var-positional argument cannot have default value") }
     | '*' (lambda_param_no_default | ',') lambda_param_maybe_default* a='*' (lambda_param_no_default | ',') {
         RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "* argument may appear only once") }

Lib/test/test_syntax.py

@@ -499,22 +499,22 @@
 >>> def foo(*b,*d):
 ...    pass
 Traceback (most recent call last):
-SyntaxError: * argument may appear only once
+SyntaxError: * marker may appear only once
 
 >>> def foo(a,*b,c,*d,*e,c):
 ...    pass
 Traceback (most recent call last):
-SyntaxError: * argument may appear only once
+SyntaxError: * marker may appear only once
 
 >>> def foo(a,b,/,c,*b,c,*d,*e,c):
 ...    pass
 Traceback (most recent call last):
-SyntaxError: * argument may appear only once
+SyntaxError: * marker may appear only once
 
 >>> def foo(a,b,/,c,*b,c,*d,**e):
 ...    pass
 Traceback (most recent call last):
-SyntaxError: * argument may appear only once
+SyntaxError: * marker may appear only once
 
 >>> def foo(a=1,/*,b,c):
 ...    pass
@@ -598,19 +598,19 @@
 
 >>> lambda *b,*d: None
 Traceback (most recent call last):
-SyntaxError: * argument may appear only once
+SyntaxError: * marker may appear only once
 
 >>> lambda a,*b,c,*d,*e,c: None
 Traceback (most recent call last):
-SyntaxError: * argument may appear only once
+SyntaxError: * marker may appear only once
 
 >>> lambda a,b,/,c,*b,c,*d,*e,c: None
 Traceback (most recent call last):
-SyntaxError: * argument may appear only once
+SyntaxError: * marker may appear only once
 
 >>> lambda a,b,/,c,*b,c,*d,**e: None
 Traceback (most recent call last):
-SyntaxError: * argument may appear only once
+SyntaxError: * marker may appear only once
 
 >>> lambda a=1,d=,c: None
 Traceback (most recent call last):
@@ -2178,7 +2178,7 @@
 
     >>> with (lambda *:0): pass
     Traceback (most recent call last):
-    SyntaxError: named arguments must follow bare *
+    SyntaxError: named parameters must follow bare *
 
 Corner-cases that used to crash:
 

Misc/NEWS.d/next/Library/2025-05-05-19-37-00.gh-issue-133436.assdh.rst

@@ -0,0 +1 @@
+Correct error messages that incorrectly use "arguments".