we do in fact have to cache the EOF token returned by the preprocessor.
In the case of backtracking, the cached token lexer will be the only
lexer on the stack, without this the token stack will be empty and EOF
won't be returned.
This fixes PR7072.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@108124 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Parser/backtrack-crash.cpp b/test/Parser/backtrack-crash.cpp
new file mode 100644
index 0000000..cc26873
--- /dev/null
+++ b/test/Parser/backtrack-crash.cpp
@@ -0,0 +1,4 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic
+// PR7072
+()( // expected-error {{expected unqualified-id}}
+