From b61829887db706ac648abc56adb03c8379253208 Mon Sep 17 00:00:00 2001
From: Aaron Ballman <aaron@aaronballman.com>
Date: Wed, 20 Jan 2016 22:14:10 +0000
Subject: [PATCH] Make modernize-use-default tolerant of delayed template
 parsing; this code was previously causing failed assertions because dyn_cast
 was being passed a null pointer due to the delay-parsed body.

llvm-svn: 258356
---
 .../clang-tidy/modernize/UseDefaultCheck.cpp              | 1 +
 .../test/clang-tidy/modernize-use-default-delayed.cpp     | 8 ++++++++
 2 files changed, 9 insertions(+)
 create mode 100644 clang-tools-extra/test/clang-tidy/modernize-use-default-delayed.cpp

diff --git a/clang-tools-extra/clang-tidy/modernize/UseDefaultCheck.cpp b/clang-tools-extra/clang-tidy/modernize/UseDefaultCheck.cpp
index 68ead15e2240..dbc84ef3a879 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseDefaultCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/UseDefaultCheck.cpp
@@ -272,6 +272,7 @@ void UseDefaultCheck::check(const MatchFinder::MatchResult &Result) {
   // that are not user-provided (automatically generated).
   if (SpecialFunctionDecl->isDeleted() ||
       SpecialFunctionDecl->isExplicitlyDefaulted() ||
+      SpecialFunctionDecl->isLateTemplateParsed() ||
       !SpecialFunctionDecl->isUserProvided() || !SpecialFunctionDecl->hasBody())
     return;
 
diff --git a/clang-tools-extra/test/clang-tidy/modernize-use-default-delayed.cpp b/clang-tools-extra/test/clang-tidy/modernize-use-default-delayed.cpp
new file mode 100644
index 000000000000..c7163e8d9341
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/modernize-use-default-delayed.cpp
@@ -0,0 +1,8 @@
+// RUN: clang-tidy %s -checks=-*,modernize-use-default -- -std=c++11 -fdelayed-template-parsing -fexceptions | count 0
+// Note: this test expects no diagnostics, but FileCheck cannot handle that,
+// hence the use of | count 0.
+
+template <typename Ty>
+struct S {
+  S<Ty>& operator=(const S<Ty>&) { return *this; }
+};