Issue #9232: Support trailing commas in function declarations.
For example, "def f(*, a = 3,): pass" is now legal.
Patch from Mark Dickinson.
diff --git a/Grammar/Grammar b/Grammar/Grammar
index 99fcea0..14bdecd 100644
--- a/Grammar/Grammar
+++ b/Grammar/Grammar
@@ -27,13 +27,18 @@
funcdef: 'def' NAME parameters ['->' test] ':' suite
parameters: '(' [typedargslist] ')'
-typedargslist: (tfpdef ['=' test] (',' tfpdef ['=' test])* [','
- ['*' [tfpdef] (',' tfpdef ['=' test])* [',' '**' tfpdef] | '**' tfpdef]]
- | '*' [tfpdef] (',' tfpdef ['=' test])* [',' '**' tfpdef] | '**' tfpdef)
+typedargslist: (tfpdef ['=' test] (',' tfpdef ['=' test])* [',' [
+ '*' [tfpdef] (',' tfpdef ['=' test])* [',' ['**' tfpdef [',']]]
+ | '**' tfpdef [',']]]
+ | '*' [tfpdef] (',' tfpdef ['=' test])* [',' ['**' tfpdef [',']]]
+ | '**' tfpdef [','])
tfpdef: NAME [':' test]
-varargslist: (vfpdef ['=' test] (',' vfpdef ['=' test])* [','
- ['*' [vfpdef] (',' vfpdef ['=' test])* [',' '**' vfpdef] | '**' vfpdef]]
- | '*' [vfpdef] (',' vfpdef ['=' test])* [',' '**' vfpdef] | '**' vfpdef)
+varargslist: (vfpdef ['=' test] (',' vfpdef ['=' test])* [',' [
+ '*' [vfpdef] (',' vfpdef ['=' test])* [',' ['**' vfpdef [',']]]
+ | '**' vfpdef [',']]]
+ | '*' [vfpdef] (',' vfpdef ['=' test])* [',' ['**' vfpdef [',']]]
+ | '**' vfpdef [',']
+)
vfpdef: NAME
stmt: simple_stmt | compound_stmt