Index: llvm/trunk/lib/MC/MCParser/ELFAsmParser.cpp
===================================================================
--- llvm/trunk/lib/MC/MCParser/ELFAsmParser.cpp
+++ llvm/trunk/lib/MC/MCParser/ELFAsmParser.cpp
@@ -447,7 +447,7 @@
   Lex();
   StringRef Name;
   if (getParser().parseIdentifier(Name))
-    return true;
+    return TokError("invalid metadata symbol");
   Associated = dyn_cast_or_null<MCSymbolELF>(getContext().lookupSymbol(Name));
   if (!Associated || !Associated->isInSection())
     return TokError("symbol is not in a section: " + Name);
Index: llvm/trunk/test/MC/ELF/metadata-declaration-errors.s
===================================================================
--- llvm/trunk/test/MC/ELF/metadata-declaration-errors.s
+++ llvm/trunk/test/MC/ELF/metadata-declaration-errors.s
@@ -0,0 +1,10 @@
+// RUN: not llvm-mc -triple x86_64-pc-linux-gnu %s \
+// RUN:   -filetype=obj -o %t.o 2>&1 | FileCheck %s
+
+// Check we do not silently ignore invalid metadata symbol (123).
+// CHECK: error: invalid metadata symbol
+
+.section .foo,"a"
+.quad 0
+
+.section bar,"ao",@progbits,123