Formatting config option: force_explicit_return #7155

Feature Request

Summary

I'd like the option to force all branches of all functions to use the optional return keyword.

Motivation

I think explicitly stating return rather than relying on the implicit behavior of {} blocks makes code easier to understand at a glance, and especially if there are complicated branching statements inside. (Admittedly, this is mostly a style preference, so I understand that it probably won't be a high-priority change.)

For a toy example, the proposed formatting option should change this:

fn add_one(x: u32) -> u32 {
    x + 1
}

fn foo() -> () {
    println!("This function has no return value!");
}

to this:

fn add_one(x: u32) -> u32 {
    return x + 1;
}

fn foo() -> () {
    println!("This function has no return value!");
    return;
}

This syntax is more familiar to developers with backgrounds in other languages, such as C/C++, and follows the common Rust pattern that explicit is better than implicit.

Related configuration options

I wasn't able to find anything that was directly related to my proposed option, but it would follow in the spirit of options like force_explicit_abi.