internal/importers: fix test

Updates golang/go#19046

Change-Id: I51990a3e023d0a5339df72cc372565eecf5798e1
Reviewed-on: https://go-review.googlesource.com/37318
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

internal/importers/objc/objc.go

@@ -415,7 +415,7 @@ func importModule(sdkPath, module string, identifiers []string, typeMap map[stri
 	clang := exec.Command("xcrun", "--sdk", "iphonesimulator", "clang", "-cc1", "-isysroot", sdkPath, "-ast-dump", "-fblocks", "-fobjc-arc", "-x", "objective-c", hFile)
 	out, err := clang.CombinedOutput()
 	if err != nil {
-		return nil, fmt.Errorf("clang failed to parse module: %v", err)
+		return nil, fmt.Errorf("clang failed to parse module: %v: %s", err, out)
 	}
 	p := &parser{
 		sdkPath: sdkPath,

internal/importers/objc/objc_test.go

@@ -22,14 +22,14 @@ func TestImport(t *testing.T) {
 		methods []*Func
 	}{
 		{
-			ref:  importers.PkgRef{"Foundation/NSObjectP", "Hash"},
+			ref:  importers.PkgRef{Pkg: "Foundation/NSObjectP", Name: "Hash"},
 			name: "NSObject",
 			methods: []*Func{
 				&Func{Sig: "hash", GoName: "Hash", Ret: &Type{Kind: Uint, Decl: "NSUInteger"}},
 			},
 		},
 		{
-			ref:  importers.PkgRef{"Foundation/NSString", "StringWithContentsOfFileEncodingError"},
+			ref:  importers.PkgRef{Pkg: "Foundation/NSString", Name: "StringWithContentsOfFileEncodingError"},
 			name: "NSString",
 			methods: []*Func{
 				&Func{