--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Sema/attr-availability-square-brackets.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin9 -fsyntax-only -fdouble-square-bracket-attributes -verify %s
+
+void f0() [[clang::availability(macosx,introduced=10.4,deprecated=10.2)]]; // expected-warning{{feature cannot be deprecated in macOS version 10.2 before it was introduced in version 10.4; attribute ignored}}
+void f1() [[clang::availability(ios,obsoleted=2.1,deprecated=3.0)]];  // expected-warning{{feature cannot be obsoleted in iOS version 2.1 before it was deprecated in version 3.0; attribute ignored}}
+void f2() [[clang::availability(ios,introduced=2.1,deprecated=2.1)]];
+
+extern void
+ATSFontGetName(const char *oName) [[clang::availability(macosx,introduced=8.0,deprecated=9.0, message="use CTFontCopyFullName")]]; // expected-note {{'ATSFontGetName' has been explicitly marked deprecated here}}
+
+void test_10095131() {
+  ATSFontGetName("Hello"); // expected-warning {{'ATSFontGetName' is deprecated: first deprecated in macOS 9.0 - use CTFontCopyFullName}}
+}
+
+enum
+[[clang::availability(macos, unavailable)]]
+{
+    NSDataWritingFileProtectionWriteOnly = 0x30000000,
+    NSDataWritingFileProtectionCompleteUntilUserAuthentication = 0x40000000,
+};
+
+extern int x [[clang::availability(macosx,introduced=10.5)]];
+extern int x;
+
+int i [[clang::availability(this, should = 1.0)]]; // expected-error {{'should' is not an availability stage; use 'introduced', 'deprecated', or 'obsoleted'}} \
+                                                   // expected-warning {{unknown platform 'this' in availability macro}}