error: expected one of `{` or an operator, found `}`

[glandium]

I did a stupid typo in a program, where I typed in twice in a for statement:

fn main() {
    for i in in 1..2 {
        println!("{}", i);
    }
}

The compiler pointed the error on the closing brace, which, in the real code, with much more things happening in the loop (plus nested loops) was completely unhelpful.

error: expected one of `{` or an operator, found `}`
 --> <anon>:5:1
  |
5 | }
  | ^

error: aborting due to previous error

[TimNN]

Fixing the errors reported by the compiler reveals why this parses that far:

fn main() {
    for i in in 1..2 {
        println!("{}", i);
    }
{ } }

error: placement-in expression syntax is experimental and subject to change. (see issue #27779)
 --> <anon>:2:14
  |
2 |     for i in in 1..2 {
  |              ^

[estebank]

Current output points at the char immediately after the closing of the for scope, still needs some improvement:

error: expected one of `{` or an operator, found `}`
 --> src/main.rs:5:1
  |
4 |     }
  |      - expected one of `{` or an operator here
5 | }
  | ^ unexpected token

[estebank]

Closed by #48333:

error: expected expression, found keyword `in`
 --> src/main.rs:2:14
  |
2 |     for i in in 1..2 {
  |              ^^ expected expression

---

That PR was reverted :(