1 files changed, 39 insertions, 0 deletions
diff --git a/test/Misc/ast-dump-decl.cpp b/test/Misc/ast-dump-decl.cpp
index d8072b727a..c8f7d2fe6c 100644
--- a/test/Misc/ast-dump-decl.cpp
+++ b/test/Misc/ast-dump-decl.cpp
@@ -251,6 +251,45 @@ namespace testClassTemplateDecl {
 // CHECK-NEXT:   CXXRecordDecl{{.*}} class TestClassTemplatePartial
 // CHECK-NEXT:   FieldDecl{{.*}} j
 
+// PR15220 dump instantiation only once
+namespace testCanonicalTemplate {
+  class A {};
+
+  template<typename T> void TestFunctionTemplate(T);
+  template<typename T> void TestFunctionTemplate(T);
+  void bar(A a) { TestFunctionTemplate(a); }
+  // CHECK:      FunctionTemplateDecl{{.*}} TestFunctionTemplate
+  // CHECK-NEXT:   TemplateTypeParmDecl
+  // CHECK-NEXT:   FunctionDecl{{.*}} TestFunctionTemplate 'void (T)'
+  // CHECK-NEXT:     ParmVarDecl{{.*}} 'T'
+  // CHECK-NEXT:   FunctionDecl{{.*}} TestFunctionTemplate {{.*}}A
+  // CHECK-NEXT:     TemplateArgument
+  // CHECK-NEXT:     ParmVarDecl
+  // CHECK:      FunctionTemplateDecl{{.*}} TestFunctionTemplate
+  // CHECK-NEXT:   TemplateTypeParmDecl
+  // CHECK-NEXT:   FunctionDecl{{.*}} TestFunctionTemplate 'void (T)'
+  // CHECK-NEXT:     ParmVarDecl{{.*}} 'T'
+  // CHECK-NEXT:   Function{{.*}} 'TestFunctionTemplate'
+  // CHECK-NEXT-NOT: TemplateArgument
+
+  template<typename T1> class TestClassTemplate {
+    template<typename T2> friend class TestClassTemplate;
+  };
+  TestClassTemplate<A> a;
+  // CHECK:      ClassTemplateDecl{{.*}} TestClassTemplate
+  // CHECK-NEXT:   TemplateTypeParmDecl
+  // CHECK-NEXT:   CXXRecordDecl{{.*}} class TestClassTemplate
+  // CHECK-NEXT:     CXXRecordDecl{{.*}} class TestClassTemplate
+  // CHECK-NEXT:     FriendDecl
+  // CHECK-NEXT:       ClassTemplateDecl{{.*}} TestClassTemplate
+  // CHECK-NEXT:         TemplateTypeParmDecl
+  // CHECK-NEXT:         CXXRecordDecl{{.*}} class TestClassTemplate
+  // CHECK-NEXT:         ClassTemplateSpecialization{{.*}} 'TestClassTemplate'
+  // CHECK-NEXT:   ClassTemplateSpecializationDecl{{.*}} class TestClassTemplate
+  // CHECK-NEXT:     TemplateArgument{{.*}}A
+  // CHECK-NEXT:     CXXRecordDecl{{.*}} class TestClassTemplate
+}
+
 template <class T>
 class TestClassScopeFunctionSpecialization {
   template<class U> void foo(U a) { }