Rust did a lot of things nice, but it is over cluttered with all these particularities everywhere, which could be hidden by better default conventions.

For example, everything should be a reference by default, and use of explicit & is stylistically bad.

Or why in let mut iter = a.iter(); iter is mut? It should be a simple closure which follows a protocol. In what sense it is mutable?

And such small warts are literally everywhere, together resulting in a clutter.

A functional language uniform defaults (everything is an expression, everything is a binding which implies everything s reference) are much better.