E4116

Found hole _.

If you want to represent unfinished code temporarily, use ... instead. Using ... allows the program to be checked while the implementation is incomplete, whereas _ causes a compilation error. Before committing finished code, replace the placeholder with a real expression.

Erroneous example

///|
fn value() -> Int {
  _ // Error: Found hole _
}

Suggestion

Replace the hole with an expression of the expected type:

///|
fn value() -> Int {
  0
}

///|
test {
  inspect(value(), content="0")
}