Index: llvm/utils/lit/lit/TestRunner.py
===================================================================
--- llvm/utils/lit/lit/TestRunner.py
+++ llvm/utils/lit/lit/TestRunner.py
@@ -1463,9 +1463,9 @@
     except ValueError as e:
         return lit.Test.Result(Test.UNRESOLVED, str(e))
     script = parsed['RUN:'] or []
-    test.xfails = parsed['XFAIL:'] or []
-    test.requires = parsed['REQUIRES:'] or []
-    test.unsupported = parsed['UNSUPPORTED:'] or []
+    test.xfails = test.xfails + (parsed['XFAIL:'] or [])
+    test.requires = test.requires + (parsed['REQUIRES:'] or [])
+    test.unsupported = test.unsupported + (parsed['UNSUPPORTED:'] or [])
     if parsed['ALLOW_RETRIES:']:
         test.allowed_retries = parsed['ALLOW_RETRIES:'][0]
 
Index: llvm/utils/lit/tests/Inputs/unparsed-requirements/test.py
===================================================================
--- /dev/null
+++ llvm/utils/lit/tests/Inputs/unparsed-requirements/test.py
@@ -0,0 +1,2 @@
+# REQUIRES: woof
+# RUN:
Index: llvm/utils/lit/tests/unparsed-requirements.py
===================================================================
--- /dev/null
+++ llvm/utils/lit/tests/unparsed-requirements.py
@@ -0,0 +1,18 @@
+# RUN: %{python} %s %{inputs}/unparsed-requirements 2> %t.err
+
+import sys
+from lit.Test import Result, Test, TestSuite
+from lit.TestRunner import parseIntegratedTestScript
+from lit.TestingConfig import TestingConfig
+
+class CustomTest(Test):
+    def __init__(self, suite, path_in_suite, config, file_path = None):
+        Test.__init__(self, suite, path_in_suite, config, file_path)
+        self.requires = ["meow"]
+
+config = TestingConfig(None, "config", [".txt"], None, [], [], False, sys.argv[1], sys.argv[1], [], [], True)
+suite = TestSuite("suite", sys.argv[1], sys.argv[1], config)
+test = CustomTest(suite, ["test.py"], config)
+parseIntegratedTestScript(test)
+if test.requires != ["meow", "woof"]:
+    exit(1)