Add error recovery and unloading tests.

test/CodeUnloading/ProtectedClass.h

@@ -0,0 +1,6 @@
+#ifndef PROTECTED_TRIVIAL_CLASS
+#define PROTECTED_TRIVIAL_CLASS
+class Trivial {
+
+};
+#endif // PROTECTED_TRIVIAL_CLASS

test/CodeUnloading/ProtectedClassHeader.C

@@ -0,0 +1,6 @@
+// RUN: cat %s | %cling -I%p
+.storeState "a"
+#include "ProtectedClass.h"
+.U
+.compareState "a"
+// CHECK-NOT: Differences

test/ErrorRecovery/HeaderFileProtector.C

@@ -0,0 +1,5 @@
+// RUN: cat %s | %cling -I%p -Xclang -verify 2>&1
+.storeState "a"
+#include "HeaderFileProtector.h"
+.compareState "a"
+// CHECK-NOT: Differences

test/ErrorRecovery/HeaderFileProtector.h

@@ -0,0 +1,11 @@
+#ifndef HEADER_FILE_PROTECTOR
+#define HEADER_FILE_PROTECTOR
+#define NN 5
+#undef NN
+#define NN 6
+#define P 5
+
+class MyHeaderFileProtectedClass {};
+#undef P
+error_here; // expected-error {{C++ requires a type specifier for all declarations}}
+#endif // HEADER_FILE_PROTECTOR

test/ErrorRecovery/MacroDef.C

@@ -0,0 +1,16 @@
+// RUN: cat %s | %cling -I%p -Xclang -verify 2>&1
+
+.rawInput 1
+extern "C" int printf(const char* fmt, ...);
+#define NN 5
+int printNN() {
+  printf("NN=%d", NN);
+  return 0;
+}
+.rawInput 0
+printNN();
+.storeState "MacroDef"
+#include "MacroDef.h"
+.compareState "MacroDef"
+// CHECK-NOT: Differences
+printNN();

test/ErrorRecovery/MacroDef.h

@@ -0,0 +1,8 @@
+#ifndef HEADER_FILE_PROTECTOR
+#define HEADER_FILE_PROTECTOR
+int f() {
+  return NN+1;
+}
+int n = f();
+error_here; // expected-error {{C++ requires a type specifier for all declarations}}
+#endif // HEADER_FILE_PROTECTOR