[Bug c++/55576] Fails to compile a call to template member function

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55576

--- Comment #15 from Jason Merrill <jason at gcc dot gnu.org> ---
Looking at the standard again, I notice

When the name of a member template specialization appears after . or -> in a
postfix-expression or after a nested-name-specifier in a qualified-id, and the
object expression of the postfix-expression is type-dependent or the
nested-name-specifier in the qualified-id refers to a dependent type, but the
name is not a member of the current instantiation (14.6.2.1), the member
template name must be prefixed by the keyword template.

This suggests that the 'template' keyword specifies that the following name is
a *member* template, and that we shouldn't look in the current scope at all.

It seems like the main change needed is passing template_keyword_p into
cp_parser_nested_name_specifier_opt.