error: expected one of `!` or `::`, found `foo`
  --> $DIR/fn-defined-using-func.rs:6:6
   |
LL | func foo() {}
   | ---- ^^^ expected one of `!` or `::`
   | |
   | help: write `fn` instead of `func` to declare a function

error: aborting due to 1 previous error