error: expected `:`, found `=`
  --> $DIR/issue-57684.rs:27:20
   |
LL |     let _ = X { f1 = 5 };
   |                    ^
   |
help: replace equals symbol with a colon
   |
LL |     let _ = X { f1: 5 };
   |                   ~

error: expected `:`, found `=`
  --> $DIR/issue-57684.rs:32:12
   |
LL |         f1 = 5,
   |            ^
   |
help: replace equals symbol with a colon
   |
LL |         f1: 5,
   |           ~

error: aborting due to 2 previous errors