Support some, ok and err wrappers and untyped function inputs

test/fixtures/valid/containers.ls

@@ -7,7 +7,7 @@ more_codes := [...codes, 'failed' => 500]
 empty_numbers: []i32: []
 empty_codes: [str]i32: []
 optional_numbers: []i32?: nil
-optional_elements: []{i32?}: [nil, 1->|.some]
+optional_elements: []{i32?}: [nil, some 1]
 
 Options :: &{
     name: str: 'default'