PR9793: Treat substitution as an instantiation step for the purpose of the
-ftemplate-depth limit. There are various ways to get an infinite (or merely
huge) stack of substitutions with no intervening instantiations. This is also
consistent with gcc's behavior.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159907 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaTemplate/instantiation-depth-subst.cpp b/test/SemaTemplate/instantiation-depth-subst.cpp
new file mode 100644
index 0000000..58e6374
--- /dev/null
+++ b/test/SemaTemplate/instantiation-depth-subst.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -std=c++11 -verify %s -ftemplate-depth 2
+
+// PR9793
+template<typename T> auto f(T t) -> decltype(f(t)); // \
+// expected-error {{recursive template instantiation exceeded maximum depth of 2}} \
+// expected-note 3 {{while substituting}} \
+// expected-note {{candidate}}
+
+int k = f(0); // expected-error {{no matching function for call to 'f'}}