A generic integer type for consts?

[mjw]

Previous discussions about such things include:

Pre-RFC: Untyped constants

Live version Start Date: 2015-01-15 RFC PR: (leave this empty) Rust Issue: (leave this empty) Summary Allow “typeless constants” which sidestep the issue of having to have separate constants per-type. This help ergonomics in the case of the common C pattern of using #define for constants. Motivation The biggest pain this intends to solve is #define based constants. Additionally, some C APIs, such as OpenGL, often typedef to an intrinsic integer type but due to integer promotion rules in C, f…

Polymorphic Numeric Constants