Error Lab

A stdlib function, not a method

Builtin types keep a small method table; everything else is a stdlib function you call qualified. When a method is missing but the stdlib has it, the error names the call and the import.

let scores = [3, 4, 5]
print("{scores.sum()}")

error: no method 'sum' on List[Int] — it is a stdlib function: lists.sum(xs) (import lists) (line 2, column 16)

import lists

let scores = [3, 4, 5]
print("{lists.sum(scores)}")

12