rustdoc enhancement: indent all lines by 4 spaces in the playground

[Wilfred]

For example, https://doc.rust-lang.org/std/env/fn.args.html includes the following code sample:

use std::env;

// Prints each argument on a separate line
for argument in env::args() {
    println!("{}", argument);
}

However, the run button produces this URL:

https://play.rust-lang.org/?code=fn%20main()%20%7B%0Ause%20std%3A%3Aenv%3B%0A%0A%2F%2F%20Prints%20each%20argument%20on%20a%20separate%20line%0Afor%20argument%20in%20env%3A%3Aargs()%20%7B%0A%20%20%20%20println!(%22%7B%7D%22%2C%20argument)%3B%0A%7D%0A%7D

which gives the following code in the playground:

fn main() {
use std::env;

// Prints each argument on a separate line
for argument in env::args() {
    println!("{}", argument);
}
}

This is a papercut: could we just indent all lines by four spaces? Ideally we'd show the code in the playground with indentation that looks pretty similar to code in a full program.

An alternative option would be to run rustfmt when code is sent to the playground. This risks changing the formatting of the example, which potentially surprising to readers. The advantage of this is that it works with multiline string literals too:

// indenting every line by 4 spaces here would change the value oft he string
let x = "
";

[frewsxcv]

This looks like a duplicate of #35483. Thanks for filing though!

[Wilfred]

Argh, I missed it. Sorry for the noise. @frewsxcv would you mind correcting the spelling in the title of #35483?

[frewsxcv]

@Wilfred Ah, good catch, fixed