error: missing expression to iterate on in `for` loop
  --> $DIR/missing-expression-in-for-loop.rs:2:14
   |
LL |     for i in {
   |              ^
   |
help: try adding an expression to the `for` loop
   |
LL |     for i in /* expression */ {
   |              ++++++++++++++++

error: aborting due to previous error