let a simple last be a single value

[sophiajt]

Description

before:

> [1, 2, 3] | last
[3]

now:

> [1, 2, 3] | last
3

Tests

Make sure you've run and fixed any issues with these commands:

• cargo fmt --all -- --check to check standard code formatting (cargo fmt --all applies these changes)
• cargo clippy --all --all-features -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect to check that you're using the standard code style
• cargo build; cargo test --all --all-features to check that all the tests pass

[fdncred]

This broke my prompt but I like this change. Good job! A real quality-of-life improvement. I really dislike having to do | get 0 or $blah.0. Thanks.