The diagnostic for the following invalid code snippet could be improved:
=================================
template<typename> struct A {};
namespace N {}
A<N> a;
=================================
On mainline we now get:
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: expected constructor, destructor, or type conversion before
'<' token
With 3.3.5 we get:
bug5.cc:5: error: use of namespace `N' as expression
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: ISO C++ forbids declaration of `a' with no type
which is okay IMHO. With 3.4.3 we get
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: invalid type in declaration before ';' token
which is less informative, but still okay.
With the current 3.4 branch we almost get the same mess as with mainline.
--
Summary: [3.4/4.0 regression] Bad diagnostic for namespace as
template parameter
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: diagnostic, monitored
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: reichelt at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19499
