PR c++/85761 - ICE with ill-formed use of const outer variable.

	* expr.c (mark_use): Handle location wrappers.

From-SVN: r261121

gcc/cp/ChangeLog

+2018-06-02  Jason Merrill  <jason@redhat.com>
+
+	PR c++/85761 - ICE with ill-formed use of const outer variable.
+	* expr.c (mark_use): Handle location wrappers.
+
 2018-06-01  Jason Merrill  <jason@redhat.com>
 
 	PR c++/85764 - bogus 'this' not captured error.

gcc/cp/expr.c

@@ -139,6 +139,9 @@ mark_use (tree expr, bool rvalue_p, bool read_p,
 		  break;
 		}
 	    }
+	  temp_override<location_t> l (input_location);
+	  if (loc != UNKNOWN_LOCATION)
+	    input_location = loc;
 	  expr = process_outer_var_ref (expr, tf_warning_or_error, true);
 	  if (!(TREE_TYPE (oexpr)
 		&& TYPE_REF_P (TREE_TYPE (oexpr))))
@@ -184,6 +187,11 @@ mark_use (tree expr, bool rvalue_p, bool read_p,
 	}
       break;
     default:
+      if (location_wrapper_p (expr))
+	{
+	  loc = EXPR_LOCATION (expr);
+	  recurse_op[0] = true;
+	}
       break;
     }
 

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-const8.C

+// PR c++/85761
+// { dg-do compile { target c++11 } }
+
+template <typename T>
+void out(const T& value);
+
+struct foo {
+  void bar();
+};
+
+void foo::bar()
+{
+  constexpr int COUNT = 10000;
+  auto run = []() {
+    out(COUNT);		// { dg-error "9:not captured" }
+  };
+
+  run();
+}