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gh-140253: Improve the syntax error from an ill-positioned double-star subpattern (#140254)

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Bartosz Sławecki 2025-10-22 20:29:14 +02:00 • committed by GitHub
parent 76fea5596c
commit b3b0d75069
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5 changed files with 922 additions and 765 deletions
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@ -626,6 +626,7 @@ mapping_pattern[pattern_ty]:
CHECK(asdl_pattern_seq*, _PyPegen_get_patterns(p, items)),
NULL,
EXTRA) }
| invalid_mapping_pattern
items_pattern[asdl_seq*]:
| ','.key_value_pattern+
@ -1490,6 +1491,10 @@ invalid_class_pattern:
PyPegen_first_item(a, pattern_ty),
PyPegen_last_item(a, pattern_ty),
"positional patterns follow keyword patterns") }
invalid_mapping_pattern:
| '{' (items_pattern ',')? rest=double_star_pattern ',' items_pattern ','? '}' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(
rest,
"double star pattern must be the last (right-most) subpattern in the mapping pattern") }
invalid_class_argument_pattern[asdl_pattern_seq*]:
| [positional_patterns ','] keyword_patterns ',' a=positional_patterns { a }
invalid_if_stmt: