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-rw-r--r--lib/Serialization/ASTWriter.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index 37577ce071..2f9e1543c2 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -4780,6 +4780,7 @@ void ASTWriter::AddedVisibleDecl(const DeclContext *DC, const Decl *D) {
if (!(!D->isFromASTFile() && cast<Decl>(DC)->isFromASTFile()))
return; // Not a source decl added to a DeclContext from PCH.
+ assert(!getDefinitiveDeclContext(DC) && "DeclContext not definitive!");
AddUpdatedDeclContext(DC);
UpdatingVisibleDecls.push_back(D);
}