> When reporting on mismatching template types, the C++ compiler will now use color to highlight the mismatching parts of the template, and will elide the parameters that are common between two mismatching templates, printing [...] instead

I'll be interested to see if [...] can make instantiation error messages a lot smaller. I hope so.

Also:

> AddressSanitizer integration for std::vector, detecting out-of-range accesses to the unused capacity of a vector.