Rationale: Enable repurposing of deprecated keyword in future revisions of this International Standard
.  Effect on original feature:
A valid C++ 2014 declaration utilizing the 
register
storage-class-specifier is ill-formed in this International Standard
.  The specifier can simply be removed to retain the original meaning
.  Rationale: More intuitive deduction behavior
.  Effect on original feature:
Valid C++ 2014 code may fail to compile or may change meaning
in this International Standard
.  For example:
auto x1{1};    auto x2{1, 2};