Make it faster Want some feature from another language Less colons Bart: "Rust is a great language unless you're working with numbers or strings." DSP stuff is easier in C because I can read what I wrote and write what I mean, fewer parentheses and weird conversions. Casting is a disaster - as is short but can't error and may do the wrong thing, into and try_into are longer (and might not always do the right thing). Should be able to use any integral type to index an array. Square matrix and doing stuff with neighbors. Want to have a value representing an offset from an index, but can't have a signed index. And as usize is dangerous.