--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Lexer/c90.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,46 @@
+/* RUN: %clang_cc1 -std=c90 -fsyntax-only %s -verify -pedantic-errors
+ */
+
+enum { cast_hex = (long) (
+      0x0p-1   /* expected-error {{hexadecimal floating constants are a C99 feature}} */
+     ) };
+
+/* PR2477 */
+int test1(int a,int b) {return a//* This is a divide followed by block comment in c89 mode */
+b;}
+
+// comment accepted as extension    /* expected-error {{// comments are not allowed in this language}}
+
+void test2() {
+  const char * str =
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds" // expected-error{{string literal of length 845 exceeds maximum length 509 that C90 compilers are required to support}}
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds"
+    "sdjflksdjf lksdjf skldfjsdkljflksdjf kldsjflkdsj fldks jflsdkjfds";
+}
+
+void test3() {
+  (void)L"\u1234";  // expected-error {{universal character names are only valid in C99 or C++}}
+  (void)L'\u1234';  // expected-error {{universal character names are only valid in C99 or C++}}
+}
+
+#define PREFIX(x) foo ## x
+int test4() {
+  int PREFIX(0p) = 0;
+  int *p = &PREFIX(0p+1);
+  return p[-1];
+}
+
+#define MY_UCN \u00FC // expected-warning {{universal character names are only valid in C99 or C++; treating as '\' followed by identifier}}
+#define NOT_A_UCN \h // no-warning
+
+extern int idWithUCN\u00FC; // expected-warning {{universal character names are only valid in C99 or C++; treating as '\' followed by identifier}} expected-error {{expected ';'}}