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-rw-r--r--lib/AST/ASTContext.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 9fb2dc1a94..820288eae3 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -61,6 +61,10 @@ const RawComment *ASTContext::getRawCommentForDeclNoCache(const Decl *D) const {
assert(D);
+ // User can not attach documentation to implicit declarations.
+ if (D->isImplicit())
+ return NULL;
+
// TODO: handle comments for function parameters properly.
if (isa<ParmVarDecl>(D))
return NULL;