[clang-format] Handle leading comments in using declaration

This fixes clang-format internal assertion for the following code:

  /* override */ using std::string;

Patch by Igor Sugak. Thank you.

llvm-svn: 317901

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/unittests/Format/UsingDeclarationsSorterTest.cpp b/clang/unittests/Format/UsingDeclarationsSorterTest.cpp
index e72076a8e31..37427a51f82 100644
--- a/clang/unittests/Format/UsingDeclarationsSorterTest.cpp
+++ b/clang/unittests/Format/UsingDeclarationsSorterTest.cpp
@@ -348,6 +348,13 @@ TEST_F(UsingDeclarationsSorterTest, SortsPartialRangeOfUsingDeclarations) {
                                   {tooling::Range(19, 1)}));
 }
 
+TEST_F(UsingDeclarationsSorterTest, SortsUsingDeclarationsWithLeadingkComments) {
+  EXPECT_EQ("/* comment */ using a;\n"
+            "/* comment */ using b;",
+            sortUsingDeclarations("/* comment */ using b;\n"
+                                  "/* comment */ using a;"));
+}
+
 } // end namespace
 } // end namespace format
 } // end namespace clang