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bpo-45764: improve error message when missing '(' after 'def' (GH-29484)

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to achieve this, change the grammar to expect the '(' token after 'def' NAME.

Automerge-Triggered-By: GH:pablogsal
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Carl Friedrich Bolz-Tereick 2021-11-09 15:03:32 +01:00 • committed by GitHub
parent f4c03484da
commit 2819e98d10
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4 changed files with 34 additions and 14 deletions
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4
Grammar/python.gram
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@ -264,11 +264,11 @@ function_def[stmt_ty]:
function_def_raw[stmt_ty]:
| invalid_def_raw
| 'def' n=NAME '(' params=[params] ')' a=['->' z=expression { z }] &&':' tc=[func_type_comment] b=block {
| 'def' n=NAME &&'(' params=[params] ')' a=['->' z=expression { z }] &&':' tc=[func_type_comment] b=block {
_PyAST_FunctionDef(n->v.Name.id,
(params) ? params : CHECK(arguments_ty, _PyPegen_empty_arguments(p)),
b, NULL, a, NEW_TYPE_COMMENT(p, tc), EXTRA) }
| ASYNC 'def' n=NAME '(' params=[params] ')' a=['->' z=expression { z }] &&':' tc=[func_type_comment] b=block {
| ASYNC 'def' n=NAME &&'(' params=[params] ')' a=['->' z=expression { z }] &&':' tc=[func_type_comment] b=block {
CHECK_VERSION(
stmt_ty,
5,