This one shows up when you write a bare type name like List, but List is actually declared inside a different module (say, list), and you never told Turf you wanted to use that short name directly. Turf won’t guess – it wants you to either spell out where the type comes from, or explicitly bring the short name into your file.
You’ve got two ways to fix this, and either one works:
import list;mut l: list::List<int> = list::List::default();That fully-qualified form needs the plain import list; (without it the error is E145, “module not imported”). Or, if you’d rather use the short name everywhere in the file:
import list::List;mut l: List<int> = List::default();Here’s what triggers the error – using the short name with neither of those:
mut l: List<int> = List::default();// ERROR: 'List' isn't visible here without qualification.If you’re not sure which module a type actually lives in, the error message tells you – it names the owning module directly, so you can copy that name straight into either the qualified form or the import line.
This is really just Turf being explicit about where things come from, especially useful once your program starts pulling in several modules that might otherwise have similarly-named types.
Run turf --explain E032 in a terminal to read this again.