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-rw-r--r--lib/Lex/MacroInfo.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Lex/MacroInfo.cpp b/lib/Lex/MacroInfo.cpp
index 924613dcb8405..bec434085e3a2 100644
--- a/lib/Lex/MacroInfo.cpp
+++ b/lib/Lex/MacroInfo.cpp
@@ -33,7 +33,7 @@ MacroInfo::MacroInfo(SourceLocation DefLoc)
UsedForHeaderGuard(false) {
}
-unsigned MacroInfo::getDefinitionLengthSlow(SourceManager &SM) const {
+unsigned MacroInfo::getDefinitionLengthSlow(const SourceManager &SM) const {
assert(!IsDefinitionLengthCached);
IsDefinitionLengthCached = true;