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diff --git a/test/MC/ARM/comment.s b/test/MC/ARM/comment.s
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+@ Tests to check that '@' does not get lexed as an identifier for arm
+@ RUN: llvm-mc %s -triple=armv7-linux-gnueabi | FileCheck %s
+@ RUN: llvm-mc %s -triple=armv7-linux-gnueabi 2>&1 | FileCheck %s --check-prefix=ERROR
+
+foo:
+ bl boo@plt should be ignored
+ bl goo@plt
+ .long bar@got to parse this as a comment
+ .long baz@got
+ add r0, r0@ignore this extra junk
+
+@ the symver directive should allow @ in the second symbol name
+defined1:
+defined2:
+defined3:
+bar:
+ .symver defined1, bar1@zed
+ .symver defined2, bar3@@zed
+ .symver defined3, bar5@@@zed
+
+far:
+ .long baz@got
+
+@CHECK-LABEL: foo:
+@CHECK: bl boo
+@CHECK-NOT: @
+@CHECK: bl goo
+@CHECK-NOT: @
+@CHECK: .long bar
+@CHECK-NOT: @
+@CHECK: .long baz
+@CHECK-NOT: @
+@CHECK: add r0, r0
+@CHECK-NOT: @
+
+@CHECK-LABEL: bar:
+@CHECK: bar1@zed = defined1
+@CHECK: bar3@@zed = defined2
+@CHECK: bar5@@@zed = defined3
+
+@ Make sure we did not mess up the parser state and it still lexes
+@ comments correctly by excluding the @ in normal symbols
+@CHECK-LABEL: far:
+@CHECK: .long baz
+@CHECK-NOT: @
+
+@ERROR-NOT: error: