re PR c++/80873 (ICE in tsubst_copy when trying to use an overloaded function…

re PR c++/80873 (ICE in tsubst_copy when trying to use an overloaded function without a definition in a lambda)

2017-10-13  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/80873
	* g++.dg/cpp1y/auto-fn41.C: New.
	* g++.dg/cpp1y/auto-fn42.C: Likewise.

From-SVN: r253733

gcc/testsuite/ChangeLog

+2017-10-13  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/80873
+	* g++.dg/cpp1y/auto-fn41.C: New.
+	* g++.dg/cpp1y/auto-fn42.C: Likewise.
+
 2017-10-13  David Malcolm  <dmalcolm@redhat.com>
 
 	* g++.dg/cpp0x/udlit-extern-c.C: New test case.

gcc/testsuite/g++.dg/cpp1y/auto-fn41.C

+// PR c++/80873
+// { dg-do compile { target c++14 } }
+
+struct S {};
+
+auto overloaded(S &);
+
+template <typename T>
+int overloaded(T &) {
+    return 0;
+}
+
+template <typename T>
+auto returns_lambda(T &param) {
+	return [&] {
+		overloaded(param);  // { dg-error "before deduction" }
+	};
+}
+
+int main() {
+	S s;
+	returns_lambda(s);
+}

gcc/testsuite/g++.dg/cpp1y/auto-fn42.C

+// PR c++/80873
+// { dg-do compile { target c++14 } }
+
+struct Buffer {};
+
+auto parse(Buffer b);
+template <typename T> void parse(T target);
+
+template <typename T>
+auto field(T target) {
+	return [&] {
+		parse(target);
+	};
+}
+
+template <typename T>
+void parse(T target) {}
+
+auto parse(Buffer b) {
+	field(0);
+}