reenable unittest for mangle/demangle
fix property enforcement
Merge pull request #1604 from 9rnsr/enforceProp

fix property enforcement
Merge pull request #1595 from rainers/reenable_demangle_test

reenable unittest for mangle/demangle
Fix `toStringRadixConvert` call in `std.conv.toImpl`.

`toStringRadixConvert` is not a property.
Merge pull request #1606 from denis-sh/fix-`toStringRadixConvert`-call-in-`std.conv.toImpl`

Fix `toStringRadixConvert` call in `std.conv.toImpl`.