[ASTImporter] Import TemplateParameterLists in function templates.

Summary: Correct missing import of TemplateParameterList in function decl.

Reviewers: martong, a.sidorin, shafik

Reviewed By: martong

Subscribers: rnkovacs, dkrupp, Szelethus, gamesh411, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D60461

llvm-svn: 360132

1 files changed, 18 insertions, 0 deletions

diff --git a/clang/unittests/AST/ASTImporterTest.cpp b/clang/unittests/AST/ASTImporterTest.cpp
index 7cac2b57036..952e6f92db8 100644
--- a/clang/unittests/AST/ASTImporterTest.cpp
+++ b/clang/unittests/AST/ASTImporterTest.cpp
@@ -5083,6 +5083,24 @@ TEST_P(ASTImporterOptionSpecificTestBase,
   EXPECT_FALSE(ImportedD->getUnderlyingType()->isIncompleteType());
 }
 
+TEST_P(ASTImporterOptionSpecificTestBase, ImportTemplateParameterLists) {
+  auto Code =
+      R"(
+      template<class T>
+      int f() { return 0; }
+      template <> int f<int>() { return 4; }
+      )";
+
+  Decl *FromTU = getTuDecl(Code, Lang_CXX);
+  auto *FromD = FirstDeclMatcher<FunctionDecl>().match(FromTU,
+      functionDecl(hasName("f"), isExplicitTemplateSpecialization()));
+  ASSERT_EQ(FromD->getNumTemplateParameterLists(), 1);
+
+  auto *ToD = Import(FromD, Lang_CXX);
+  // The template parameter list should exist.
+  EXPECT_EQ(ToD->getNumTemplateParameterLists(), 1);
+}
+
 struct ASTImporterLookupTableTest : ASTImporterOptionSpecificTestBase {};
 
 TEST_P(ASTImporterLookupTableTest, OneDecl) {