diff options
Diffstat (limited to 'Tools/peg_generator')
| -rw-r--r-- | Tools/peg_generator/pegen/grammar.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Tools/peg_generator/pegen/grammar.py b/Tools/peg_generator/pegen/grammar.py index 03d60d0..a6c19bc 100644 --- a/Tools/peg_generator/pegen/grammar.py +++ b/Tools/peg_generator/pegen/grammar.py @@ -35,7 +35,13 @@ class GrammarVisitor: class Grammar: def __init__(self, rules: Iterable[Rule], metas: Iterable[Tuple[str, Optional[str]]]): - self.rules = {rule.name: rule for rule in rules} + # Check if there are repeated rules in "rules" + all_rules = {} + for rule in rules: + if rule.name in all_rules: + raise GrammarError(f"Repeated rule {rule.name!r}") + all_rules[rule.name] = rule + self.rules = all_rules self.metas = dict(metas) def __str__(self) -> str: |