PR c++/84091 - ICE with local class in lambda in template.

	* decl2.c (determine_visibility): Look for outer containing template
	instantiation.

From-SVN: r257202

gcc/cp/ChangeLog

 2018-01-30  Jason Merrill  <jason@redhat.com>
 
+	PR c++/84091 - ICE with local class in lambda in template.
+	* decl2.c (determine_visibility): Look for outer containing template
+	instantiation.
+
 	PR c++/84098 - ICE with lambda in template NSDMI.
 	* pt.c (instantiate_class_template_1): Ignore more lambdas.
 

gcc/cp/decl2.c

@@ -2418,6 +2418,16 @@ determine_visibility (tree decl)
 	     by that.  */
 	  if (DECL_LANG_SPECIFIC (fn) && DECL_USE_TEMPLATE (fn))
 	    template_decl = fn;
+	  else if (template_decl)
+	    {
+	      /* FN must be a regenerated lambda function, since they don't
+		 have template arguments.  Find a containing non-lambda
+		 template instantiation.  */
+	      tree ctx = fn;
+	      while (ctx && !get_template_info (ctx))
+		ctx = get_containing_scope (ctx);
+	      template_decl = ctx;
+	    }
 	}
       else if (VAR_P (decl) && DECL_TINFO_P (decl)
 	       && flag_visibility_ms_compat)

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-local1.C

+// PR c++/84091
+// { dg-do compile { target c++11 } }
+
+template < typename > void f ()
+{ 
+  [] { struct A {} a; } ();
+}
+
+int main ()
+{ 
+  f < int > ();
+  return 0;
+}