[clang-tidy] Fix a regression issue introduced by r285239.

Summary:
r285239 changes the behavior of AST CXXDefaultArgExpr node.

Update `modernize-use-nullptr` to handle CXXDefaultArgExpr correctly.

Reviewers: alexfh

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D26301

llvm-svn: 286156

1 files changed, 11 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-tidy/modernize-use-nullptr.cpp b/clang-tools-extra/test/clang-tidy/modernize-use-nullptr.cpp
index e1267bf9a5a..e1ab843404e 100644
--- a/clang-tools-extra/test/clang-tidy/modernize-use-nullptr.cpp
+++ b/clang-tools-extra/test/clang-tidy/modernize-use-nullptr.cpp
@@ -217,3 +217,14 @@ C<bool, F(0)> c;
 // CHECK-MESSAGES: :[[@LINE-1]]:11: warning: use nullptr
 // CHECK-FIXES: C<bool, F(nullptr)> c;
 #undef F
+
+// Test default argument expression.
+struct D {
+  explicit D(void *t, int *c = NULL) {}
+  // CHECK-MESSAGES: :[[@LINE-1]]:32: warning: use nullptr
+  // CHECK-FIXES: explicit D(void *t, int *c = nullptr) {}
+};
+
+void test_default_argument() {
+  D(nullptr);
+}