unterminated raw string error should explain the raw-string format a bit

[gnzlbg]

Playground:

fn foo(s: &str) { println!("{}", s) }
fn main() {
    foo(r#"
This is a raw string  
missing a # at the end
"
    );
}

produces

error: unterminated raw string
 --> src/main.rs:4:9
  |
4 |       foo(r#"
  |  _________^
5 | | This is a raw string  
6 | | missing a # at the end
7 | | "
8 | |     );
9 | | }
  | |_^

error: aborting due to previous error

that only mentions "unterminated raw-string". It would be more helpful if it would suggest adding a # after the last " to terminate the raw string.

[oli-obk]

How would one detect where the raw string ends? It might contain random " on the inside or afterwards.

let s = r#"
This is a "raw string" 
missing a # at the end
";
println!("{}", s);

[gnzlbg]

How would one detect where the raw string ends?

No idea, and good question. While suggesting exactly where to add # would be awesome, it would already be an improvement to add:

note: raw string must be terminated with a #:
#"  <--- raw string starts here
...
"#  <--- raw string ends here