--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Modules/linkage-merge.m	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,26 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -x objective-c -fmodules-cache-path=%t -emit-module -fmodule-name=linkage_merge_left %S/Inputs/module.map
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %S/Inputs -w %s -verify
+
+// Test redeclarations of functions where the original declaration is
+// still hidden.
+
+@import linkage_merge_left; // excludes "sub"
+
+extern int f0(float);
+// expected-error@-1{{conflicting types for 'f0'}}
+// expected-note@Inputs/linkage-merge-sub.h:1{{previous declaration}}
+
+static int f1(float); // okay: considered distinct
+static int f2(float); // okay: considered distinct
+extern int f3(float); // okay: considered distinct
+
+extern float v0;
+// expected-error@-1{{redeclaration of 'v0' with a different type: 'float' vs 'int'}}
+// expected-note@Inputs/linkage-merge-sub.h:6{{previous declaration is here}}
+
+static float v1;
+static float v2;
+extern float v3;
+
+typedef float T0;