http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54164
Bug #: 54164
Summary: C++11: confusion error messages for spurious
"typename"
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
Hi all,
The error message on the following input is really confusing, as G++ seems to
complain about the left-hand side of the declaration. And then its error
recovery triggers another error pretending we should be in a namespace.
$ cat foo.cc
struct base
{};
struct derived
{
using type = typename base;
};
$ g++-mp-4.8 -std=c++11 -Wall foo.cc
foo.cc:6:9: error: expected nested-name-specifier before 'type'
using type = typename base;
^
foo.cc:6:9: error: using-declaration for non-member at class scope
foo.cc:6:14: error: expected ';' before '=' token
using type = typename base;
^
foo.cc:6:14: error: expected unqualified-id before '=' token
$ g++-mp-4.8 --version
g++-mp-4.8 (MacPorts gcc48 4.8-20120729_0) 4.8.0 20120729 (experimental)
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ clang++ -std=c++11 -Wall foo.cc
foo.cc:6:25: error: expected a qualified name after 'typename'
using type = typename base;
^
foo.cc:6:24: error: expected ';' after alias declaration
using type = typename base;
^
;
2 errors generated.
