https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64073
Bug ID: 64073
Summary: Explicit duplicate template instantiation not reported
as error when using 'using'
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: eugene at hutorny dot in.ua
When derived template classes introduces a base member with using, such methods
can be explicitly instantiated more than once with the same set of parameters.
Please refer to attached sample
