How to judge if a value is in the vec?

help
1

For example:

let a : i32 = 1;
let v :i32 = vec![1,2,3];

How to know if a in v or not?

2

v.contains(&a)

3

Sorry, but no method named contians for vec?

4

It's in slice: slice - Rust

A Vec automatically coerces to a slice when needed.

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