--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Index/complete-pch-skip.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,37 @@
+namespace ns {
+int bar;
+}
+
+int main() { return ns:: }
+int main2() { return ns::foo(). }
+int main3() { PREAMBLE_ }
+
+// RUN: printf "namespace ns { struct foo { int baz }; }\n#define PREAMBLE_MAC" > %t.h
+// RUN: c-index-test -write-pch %t.h.pch -x c++-header %t.h
+//
+// RUN: c-index-test -code-completion-at=%s:5:26 -include %t.h %s | FileCheck -check-prefix=WITH-PCH %s
+// WITH-PCH: {TypedText bar}
+// WITH-PCH: {TypedText foo}
+
+// RUN: c-index-test -code-completion-at=%s:7:24 -include %t.h %s | FileCheck -check-prefix=WITH-PCH-MACRO %s
+// WITH-PCH-MACRO: {TypedText PREAMBLE_MAC}
+
+// RUN: env CINDEXTEST_COMPLETION_SKIP_PREAMBLE=1 c-index-test -code-completion-at=%s:5:26 -include %t.h %s | FileCheck -check-prefix=SKIP-PCH %s
+// SKIP-PCH-NOT: foo
+// SKIP-PCH: {TypedText bar}
+// SKIP-PCH-NOT: foo
+
+// RUN: env CINDEXTEST_COMPLETION_SKIP_PREAMBLE=1 c-index-test -code-completion-at=%s:7:24 -include %t.h %s | FileCheck -check-prefix=SKIP-PCH-MACRO %s
+// SKIP-PCH-MACRO-NOT: {TypedText PREAMBLE_MAC}
+
+// Verify that with *no* preamble (no -include flag) we still get local results.
+// SkipPreamble used to break this, by making lookup *too* lazy.
+// RUN: env CINDEXTEST_COMPLETION_SKIP_PREAMBLE=1 c-index-test -code-completion-at=%s:5:26 %s | FileCheck -check-prefix=NO-PCH %s
+// NO-PCH-NOT: foo
+// NO-PCH: {TypedText bar}
+// NO-PCH-NOT: foo
+
+// Verify that we still get member results from the preamble.
+// RUN: env CINDEXTEST_COMPLETION_SKIP_PREAMBLE=1 c-index-test -code-completion-at=%s:6:32 -include %t.h %s | FileCheck -check-prefix=MEMBER %s
+// MEMBER: {TypedText baz}
+