diff --git a/mlir/lib/TableGen/Pattern.cpp b/mlir/lib/TableGen/Pattern.cpp
--- a/mlir/lib/TableGen/Pattern.cpp
+++ b/mlir/lib/TableGen/Pattern.cpp
@@ -399,7 +399,7 @@
 }
 
 bool SymbolInfoMap::bindAttr(StringRef symbol) {
-  auto inserted = symbolInfoMap.emplace(symbol, SymbolInfo::getAttr());
+  auto inserted = symbolInfoMap.emplace(symbol.str(), SymbolInfo::getAttr());
   return symbolInfoMap.count(inserted->first) == 1;
 }