[PATCH] c++: Add testcase for now fixed issue [PR117324]

[Simon Martin]

The case in this PR does not ICE anymore after the fix for PR118319.

This patch simply adds the case to the testsuite.

Successfully tested on x86_64-apple-darwin19.6.0.

        PR c++/117324

gcc/testsuite/ChangeLog:

        * g++.dg/parse/defarg19.C: New test.

---
 gcc/testsuite/g++.dg/parse/defarg19.C | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/parse/defarg19.C

diff --git a/gcc/testsuite/g++.dg/parse/defarg19.C 
b/gcc/testsuite/g++.dg/parse/defarg19.C
new file mode 100644
index 00000000000..bb8bab28d93
--- /dev/null
+++ b/gcc/testsuite/g++.dg/parse/defarg19.C
@@ -0,0 +1,12 @@
+// PR c++/117324
+// { dg-do "compile" { target c++11 } }
+
+template<typename = int>
+struct ct1 {
+  friend void f(ct1, // { dg-error "specifies default" }
+               int = [](int p = [] {}) { return p; }(); ) // { dg-error 
"expected|declares a non-template" }
+  {}
+};
+void test() {
+  f(ct1{}); // { dg-error "missing template arguments|not declared" "" { 
target c++11_down } }
+}
-- 
2.44.0