E3004

Missing parameters list. Add () after the name of the function if it takes 0 parameter.

Erroneous example

///|
/// Error: Missing parameters list. Add `()` if function `greet` has 0 parameter.
pub fn greet -> Unit {
  println("Hello, world!")
}

Suggestion

Add () after the function name.

///|
pub fn greet() -> Unit {
  println("Hello, world!")
}