7.118 --nonstd_qualifier_deduction, --no_nonstd_qualifier_deduction
Controls whether or not nonstandard template argument deduction is performed in the qualifier portion of a qualified name in C++.
With this feature enabled, a template argument for the template parameter
T can be deduced in contexts like
T::B. The standard deduction mechanism treats these as nondeduced
contexts that use the values of template parameters that were either explicitly specified or
--nonstd_qualifier_deduction is provided only as a migration
aid for legacy source code that does not conform to the C++ standard. ARM does not
recommend its use.
This option is effective only if the source language is C++.
The default is