Fix crash when a decltype expression in a trailing return type refers to the

function being instantiated. An error recovery codepath was recursively
performing name lookup (and triggering an unbounded stack of template
instantiations which blew out the stack before hitting the depth limit).

Patch by Wei Pan!

llvm-svn: 164586

1 files changed, 16 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/trailing-return-0x.cpp b/clang/test/SemaCXX/trailing-return-0x.cpp
index c219b77d9e4..462b4fa3da0 100644
--- a/clang/test/SemaCXX/trailing-return-0x.cpp
+++ b/clang/test/SemaCXX/trailing-return-0x.cpp
@@ -69,3 +69,19 @@ X<int> xx;
 only<int> p2 = xx.f(0L);
 only<double> p3 = xx.g(0L, 1.0);
 only<double> p4 = xx.get_nested<double>().h(0L, 1.0, 3.14f);
+
+namespace PR12053 {
+  template <typename T>
+  auto f1(T t) -> decltype(f1(t)) {} // expected-note{{candidate template ignored}}
+  
+  void test_f1() {
+    f1(0); // expected-error{{no matching function for call to 'f1'}}
+  }
+  
+  template <typename T>
+  auto f2(T t) -> decltype(f2(&t)) {} // expected-note{{candidate template ignored}}
+  
+  void test_f2() {
+    f2(0); // expected-error{{no matching function for call to 'f2'}}
+  }
+}