The Rust standard library has a char::escape_default function which will print the literal character if it's printable, or a sensible escape sequence (\n, \u{XXXX}, etc.) if not.
Is there an equivalent for bytes? Specifically, I would like it to return the literal byte if it's printable, or return a byte escape sequence (\xNN) if not.
The standard library has a std::ascii::escape_default function that satisfies this use case:
fn main() {
let x = String::from_utf8(
"The compiler said “you have an error!”."
.bytes()
.flat_map(|b| std::ascii::escape_default(b))
.collect::<Vec<u8>>(),
)
.unwrap();
println!("{}", x);
}