[Bug c++/23586] New: [3.4/4.0/4.1 regression] Bad diagnostic for invalid namespace-name

[reichelt at gcc dot gnu dot org]

For an invalid code snippet like

  int i;
  namespace N = i;

we issue the error message

  bug.cc:2: error: expected namespace-name before ';' token
  bug.cc:2: error: unknown namespace '<declaration error>'

with the not very helpful '<declaration error>'.

The situation for the code snippet

  int i;
  using namespace i;

is similar. Here we get the error message:

  bug.cc:2: error: expected namespace-name before ';' token
  bug.cc:2: error: '<type error>' is not a namespace

With the old parser we got

  bug.cc:2: error: unknown namespace `i'

resp.

  bug.cc:2: error: namespace `i' undeclared

so this qualifies as a diagnostic regression.

I'll post a patch soon.

-- 
           Summary: [3.4/4.0/4.1 regression] Bad diagnostic for invalid
                    namespace-name
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          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=23586