Affected subclause:[temp.deduct.type] Change: Allowance to deduce from the type of a non-type template argument.
Rationale: In combination with the ability to declare
non-type template arguments with placeholder types,
allows partial specializations to decompose
from the type deduced for the non-type template argument.
Effect on original feature: Valid C++ 2014 code may fail to compile
or produce different results in this International Standard: