error: expected identifier, found `:`
  --> $DIR/type-ascription-instead-of-let.rs:7:13
   |
LL |         temp: i32 = fun(5i32);
   |             ^ expected identifier
   |
help: you might have meant to introduce a new binding
   |
LL |         let temp: i32 = fun(5i32);
   |         +++

error: aborting due to previous error