diff --git a/test/Sema/transparent-union.c b/test/Sema/transparent-union.c
index ab1ba18..eff7df6 100644
--- a/test/Sema/transparent-union.c
+++ b/test/Sema/transparent-union.c
@@ -1,4 +1,4 @@
-// RUN: %clang -fsyntax-only -Xclang -verify %s
+// RUN: %clang_cc1 -fsyntax-only -verify %s
 typedef union {
   int *ip;
   float *fp;
@@ -70,4 +70,22 @@
   int4 vec; // expected-warning{{first field of a transparent union cannot have vector type 'int4'; transparent_union attribute ignored}}
 } TU5 __attribute__((transparent_union));
 
-  
+union pr15134 {
+  unsigned int u;
+  struct {
+    unsigned int expo:2;
+    unsigned int mant:30;
+  } __attribute__((packed));
+  // The packed attribute is acceptable because it defines a less strict
+  // alignment than required by the first field of the transparent union.
+} __attribute__((transparent_union));
+
+union pr15134v2 {
+  struct { // expected-note {{alignment of first field is 32 bits}}
+    unsigned int u1;
+    unsigned int u2;
+  };
+  struct {  // expected-warning {{alignment of field '' (64 bits) does not match the alignment of the first field in transparent union; transparent_union attribute ignored}}
+    unsigned int u3;
+  } __attribute__((aligned(8)));
+} __attribute__((transparent_union));