What `gl::GetUniformLocation` excepts (rust)
I'm writing app with rust and opengl, done much work with matrices, but it isn't works. After some tests, I found, that location is -1. but shader's code contains used name. It isn't work when `name` is `&str` and used as `name.as_ptr().cast()` for casting to `*const i8` type.

Where is readable docs? May anyone tell me?