Lib.rs

Rust .collect() cannot infer type?

let data = vec![1,2,3].iter().map(|x|x*x).collect();
    ^^^^ cannot infer type for `_`

The expression is ambiguous, because .collect() can create not just Vec, but HashMap, String, and others.

Specify the type you want. It's not necessary to type it in full, e.g. Vec<_> is enough.

let data: Vec<_> = iter.collect();
let data = iter.collect::<Vec<_>>();

Try it: Rust Playground

PS: Itertools has .collect_vec().