Add support for 4-byte UCNs like \U12345678. Warn about UCNs in c90 mode.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@115743 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Lexer/wchar.c b/test/Lexer/wchar.c
new file mode 100644
index 0000000..cbc0c45
--- /dev/null
+++ b/test/Lexer/wchar.c
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -fsyntax-only -fshort-wchar -verify %s
+
+void f() {
+ (void)L"\U00010000"; // expected-warning {{character unicode escape sequence too long for its type}}
+}
+