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Reject invalid %prec usage in rule definitions #822

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Merged
ydah merged 1 commit into from
Oct 23, 2026
Merged

Reject invalid %prec usage in rule definitions #822

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91 changes: 48 additions & 43 deletions lib/lrama/parser.rb
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7 changes: 6 additions & 1 deletion parser.y
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Original file line number Diff line number Diff line change
Expand Up @@ -346,7 +346,12 @@ rule
| rule_rhs "%prec" symbol
{
on_action_error("multiple %prec in a rule", val[0]) if prec_seen?
@prec_seen = true
if val[0].empty?
@opening_prec_seen = true
else
@trailing_prec_seen = true
end

node = Grammar::Node::RuleRhs::Prec.new(
token: val[2],
location: val[2].loc
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