E0063

Warning name: syntax_lint

Syntax lint warning.

This warning is emitted for code patterns that are valid but discouraged by the compiler's syntax lints.

Erroneous example

suberror DivError { DivError(String) }

fn div(x : Int, y : Int) -> Int raise DivError {
  if y == 0 {
    raise DivError("division by zero")
  }
  x / y
}

test {
  let res = match (try? div(6, 0)) {
    Ok(v) => v
    Err(_) => 0
  }
  inspect(res, content="0")
}

Suggestion

Follow the suggestion in the compiler lint message.

suberror DivError { DivError(String) }

fn div(x : Int, y : Int) -> Int raise DivError {
  if y == 0 {
    raise DivError("division by zero")
  }
  x / y
}

test {
  try div(6, 0) catch {
    DivError(_) => inspect(0, content="0")
  } noraise {
    v => inspect(v, content="0")
  }
}