XO0164: `(`, `[`, or `{` not closed before end of file

The file ended while a delimiter was still open. The diagnostic points at the opening delimiter and notes where the file ended. The prototype reports this for an unclosed {; an unclosed ( or [ currently surfaces as XO0160 at the token that cannot continue the list. See core 15.

Example

fn f() -> Int {
  1

Fix

fn f() -> Int {
  1
}

Run xo explain XO0164 for this text in a terminal, or see section 10.6 of the specification.