[patch] Fix PR c++/23586: Bad diagnostic for invalid namespace-name

[Mark Mitchell]

Volker Reichelt wrote:

> 2005-08-26  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
> 
> 	* parser.c (cp_parser_namespace_name): Move diagnostic for
>         invalid namespace-name to here from ...
> 	* name-lookup.c (do_namespace_alias): ... here and ...
> 	(do_using_directive): ... here.  Remove dead code.

OK.

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Mark Mitchell
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