Surprising error note "this delimiter might not be properly closed"

[arielb1]

STR

fn main() {
    S { x: 4,
        y: 5 };
}
fn foo() {

Expected Result

An error message pointing to foo

Actual Result

   Compiling playground v0.0.1 (/playground)
error: this file contains an un-closed delimiter
 --> src/main.rs:5:12
  |
2 |     S { x: 4,
  |       - this delimiter might not be properly closed...
3 |         y: 5 };
  |              - ...as it matches this but it has different indentation
4 | }
5 | fn foo() {
  |          - ^
  |          |
  |          un-closed delimiter

The heuristic feels incorrect to me - the delimiter on S looks perfectly well-closed.

[arielb1]

One way to improve the heuristic would be to not treat delimiters where the closing delimiter is more indented than the opening delimiter as suspicious (i.e., a delimiter is suspicious if it is popped by a less indented delimiter). Are there any interesting false negatives that this causes?

[arielb1]

cc @estebank - this lint was introduced in #53949 & #54092.

[iamgabrielsoft]

I had the same issue, try closing all empty braces from your for loop, if statement and function statement.

very useful for me...