error: this file contains an unclosed delimiter
  --> $DIR/issue-62894.rs:7:14
   |
LL | fn f() { assert_eq!(f(), (), assert_eq!(assert_eq!
   |        -           -                   - unclosed delimiter
   |        |           |
   |        |           unclosed delimiter
   |        unclosed delimiter
LL | 
LL | fn main() {}
   |              ^

error: this file contains an unclosed delimiter
  --> $DIR/issue-62894.rs:7:14
   |
LL | fn f() { assert_eq!(f(), (), assert_eq!(assert_eq!
   |        -           -                   - unclosed delimiter
   |        |           |
   |        |           unclosed delimiter
   |        unclosed delimiter
LL | 
LL | fn main() {}
   |              ^

error: this file contains an unclosed delimiter
  --> $DIR/issue-62894.rs:7:14
   |
LL | fn f() { assert_eq!(f(), (), assert_eq!(assert_eq!
   |        -           -                   - unclosed delimiter
   |        |           |
   |        |           unclosed delimiter
   |        unclosed delimiter
LL | 
LL | fn main() {}
   |              ^

error: expected one of `(`, `[`, or `{`, found keyword `fn`
  --> $DIR/issue-62894.rs:7:1
   |
LL | fn f() { assert_eq!(f(), (), assert_eq!(assert_eq!
   |                                                   - expected one of `(`, `[`, or `{`
LL | 
LL | fn main() {}
   | ^^ unexpected token
   |
  ::: $SRC_DIR/core/src/macros/mod.rs:LL:COL
   |
LL |     ($left:expr, $right:expr $(,)?) => {
   |      ---------- while parsing argument for this `expr` macro fragment

error: aborting due to 4 previous errors