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-rw-r--r--common/grammar-parser.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/common/grammar-parser.cpp b/common/grammar-parser.cpp
index 5a545a80..ff51cc80 100644
--- a/common/grammar-parser.cpp
+++ b/common/grammar-parser.cpp
@@ -399,7 +399,7 @@ namespace grammar_parser {
void print_grammar(FILE * file, const parse_state & state) {
try {
std::map<uint32_t, std::string> symbol_id_names;
- for (auto kv : state.symbol_ids) {
+ for (const auto & kv : state.symbol_ids) {
symbol_id_names[kv.second] = kv.first;
}
for (size_t i = 0, end = state.rules.size(); i < end; i++) {