[PR c++/86610] lambda captures in templates

https://gcc.gnu.org/ml/gcc-patches/2019-01/msg00948.html
	PR c++/86610
	* semantics.c (process_outer_var_ref): Only skip dependent types
	in templates.

	PR c++/86610
	* g++.dg/cpp0x/pr86610.C: New.

From-SVN: r268016

gcc/cp/ChangeLog

+2019-01-17  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/86610
+	* semantics.c (process_outer_var_ref): Only skip dependent types
+	in templates.
+
 2019-01-17  Alexandre Oliva <aoliva@redhat.com>
 
 	PR c++/87768

gcc/cp/semantics.c

@@ -3438,10 +3438,9 @@ process_outer_var_ref (tree decl, tsubst_flags_t complain, bool odr_use)
     }
 
   /* In a lambda within a template, wait until instantiation
-     time to implicitly capture.  */
+     time to implicitly capture a dependent type.  */
   if (context == containing_function
-      && DECL_TEMPLATE_INFO (containing_function)
-      && uses_template_parms (DECL_TI_ARGS (containing_function)))
+      && dependent_type_p (TREE_TYPE (decl)))
     return decl;
 
   if (lambda_expr && VAR_P (decl)

gcc/testsuite/ChangeLog

+2019-01-17  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/86610
+	* g++.dg/cpp0x/pr86610.C: New.
+
 2019-01-17  Wei Xiao  <wei3.xiao@intel.com>
 
 	* gcc.target/i386/avx512f-vfixupimmpd-2.c: Fix the test cases for

gcc/testsuite/g++.dg/cpp0x/pr86610.C

+// { dg-do run { target c++11 } }
+// PR c++86610 lambda capture inside template
+
+struct C
+{
+  int operator[](int)
+  { return 1; }
+
+  int operator[](int) const
+  { return 0; } // Want this one
+};
+
+int q()
+{
+  C c;
+  return [=] { return c[0]; }();
+}
+
+template <typename T>
+int f()
+{
+  C c;
+  T d;
+  return [=] { return c[0]; }() 
+    + [=] { return c[0] + d[0]; }();
+}
+
+int main()
+{
+  return q () + f<C>();
+}