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bpo-40176: Improve error messages for trailing comma on from import (GH-20294)

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Batuhan Taskaya 2020-05-21 23:41:58 +03:00 • committed by GitHub
parent d10fef35c6
commit 72e0aa2fd2
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3 changed files with 220 additions and 151 deletions
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@ -134,8 +134,9 @@ import_from[stmt_ty]:
_Py_ImportFrom(NULL, b, _PyPegen_seq_count_dots(a), EXTRA) }
import_from_targets[asdl_seq*]:
| '(' a=import_from_as_names [','] ')' { a }
| import_from_as_names
| import_from_as_names !','
| '*' { _PyPegen_singleton_seq(p, CHECK(_PyPegen_alias_for_star(p))) }
| invalid_import_from_targets
import_from_as_names[asdl_seq*]:
| a=','.import_from_as_name+ { a }
import_from_as_name[alias_ty]:
@ -670,3 +671,6 @@ invalid_double_type_comments:
invalid_del_target:
| a=star_expression &del_target_end {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "cannot delete %s", _PyPegen_get_expr_name(a)) }
invalid_import_from_targets:
| import_from_as_names ',' {
RAISE_SYNTAX_ERROR("trailing comma not allowed without surrounding parentheses") }