===================================================================
@@ -0,0 +1,18 @@
+// PR c++/51421
+// { dg-do compile { target c++11 } }
+
+int foo1(int);
+
+void bar1()
+{
+ auto i = foo1(i); // { dg-error "before deduction" }
+}
+
+struct A {};
+
+A foo2(A);
+
+void bar2()
+{
+ auto a = foo2(a); // { dg-error "before deduction" }
+}
===================================================================
@@ -4238,7 +4238,10 @@ mark_used (tree decl)
|| DECL_THUNK_P (decl))
{
if (!processing_template_decl && type_uses_auto (TREE_TYPE (decl)))
- error ("use of %qD before deduction of %<auto%>", decl);
+ {
+ error ("use of %qD before deduction of %<auto%>", decl);
+ return false;
+ }
return true;
}
@@ -4284,7 +4287,10 @@ mark_used (tree decl)
}
if (type_uses_auto (TREE_TYPE (decl)))
- error ("use of %qD before deduction of %<auto%>", decl);
+ {
+ error ("use of %qD before deduction of %<auto%>", decl);
+ return false;
+ }
/* If we don't need a value, then we don't need to synthesize DECL. */
if (cp_unevaluated_operand != 0)
===================================================================
@@ -3220,11 +3220,12 @@ finish_id_expression (tree id_expression,
/* Mark variable-like entities as used. Functions are similarly
marked either below or after overload resolution. */
- if (TREE_CODE (decl) == VAR_DECL
- || TREE_CODE (decl) == PARM_DECL
- || TREE_CODE (decl) == CONST_DECL
- || TREE_CODE (decl) == RESULT_DECL)
- mark_used (decl);
+ if ((TREE_CODE (decl) == VAR_DECL
+ || TREE_CODE (decl) == PARM_DECL
+ || TREE_CODE (decl) == CONST_DECL
+ || TREE_CODE (decl) == RESULT_DECL)
+ && !mark_used (decl))
+ return error_mark_node;
/* Only certain kinds of names are allowed in constant
expression. Template parameters have already