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diff --git a/test/MC/AsmParser/negative_altmacro_string.s b/test/MC/AsmParser/negative_altmacro_string.s
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+# RUN: not llvm-mc -triple i386-linux-gnu %s 2>&1 | FileCheck %s
+
+# This test checks the altmacro string delimiter '<' and '>'.
+# In this test we check the '.noaltmacro' directive.
+# We expect that '.altmacro' and '.noaltmacro' will act as a switch on/off directives to the alternate macro mode.
+# .noaltmacro returns the format into a regular macro handling.
+# The default mode is ".noaltmacro". 
+
+# Test #1: default mode
+# CHECK:  error: unexpected token at start of statement
+# CHECK-NEXT: <simpleCheck>:
+.macro simple_check_0 name
+    \name:
+.endm
+
+simple_check_0 <simpleCheck>
+
+
+.altmacro
+.noaltmacro
+
+# Test #2: Switching from alternate mode to default mode
+# CHECK:  error: unexpected token at start of statement
+# CHECK-NEXT: <simpleCheck1>:
+.macro simple_check_1 name
+    \name:
+.endm
+
+simple_check_1 <simpleCheck1>