Fix a couple of bugs, add some new cool stuff.
1. Fix a todo in Parser::ParseTag, to recover better. On code like
that in test/Sema/decl-invalid.c it causes us to return a single
error instead of multiple.
2. Fix an error in Sema::ParseDeclarator, where it would crash if the
declarator didn't have an identifier. Instead, diagnose the problem.
3. Start adding infrastructure to track the range of locations covered
by a declspec or declarator. This is mostly implemented for declspec,
but could be improved, it is missing for declarator.
Thanks to Neil for pointing out this crash.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@40482 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/paste_bad.c b/test/Preprocessor/paste_bad.c
new file mode 100644
index 0000000..89e8799
--- /dev/null
+++ b/test/Preprocessor/paste_bad.c
@@ -0,0 +1,17 @@
+// GCC PR 20077
+// RUN: not clang -E %s &&
+// RUN: not clang -E %s 2>&1 | grep error: | wc -l | grep 10
+
+#define a a ## ## /* { dg-error "end of a macro expansion" } */
+#define b() b ## ## /* { dg-error "end of a macro expansion" } */
+#define c c ## /* { dg-error "end of a macro expansion" } */
+#define d() d ## /* { dg-error "end of a macro expansion" } */
+
+
+#define e ## ## e /* { dg-error "end of a macro expansion" } */
+#define f() ## ## f /* { dg-error "end of a macro expansion" } */
+#define g ## g /* { dg-error "end of a macro expansion" } */
+#define h() ## h /* { dg-error "end of a macro expansion" } */
+#define i ## /* { dg-error "end of a macro expansion" } */
+#define j() ## /* { dg-error "end of a macro expansion" } */
+