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c++/6601: Parse error when using :: qualified name in template.

>Number:         6601
>Category:       c++
>Synopsis:       Parse error when using :: qualified name in template.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Tue May 07 15:26:01 PDT 2002
>Originator:     Reiner Hauser
>Release:        3.0.2
Michigan State University
Linux RedHat 7.1 with local changes
System: Linux wensley-clued0 2.4.14-0.1XFSsmp #1 SMP Mon Nov 12 09:22:08 CST 2001 i686 unknown
Architecture: i686

host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ./configure --prefix=/scratch/1/veseli/gcc --with-gnu-as --with-gnu-ld --enable-shared --enable-threads --enable-languages=c,c++
	When instantiating a template class with a another class qualified
with :: the compiler reports a parse error. This is true both for standard
templates like vector or user defined templates.

	template<class T>
	class MyTemplate
	class X {};
	MyTemplate<::X> test;
	Replacing ::X with 'class ::X' allows to work around the problem.

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