exit status: 1 with stderr:
<stdin>:1:23: error: consecutive statements on a line must be separated by ';' func foo() -> __opaque Collection { ^ ; <stdin>:1:15: error: use of undeclared type '__opaque' func foo() -> __opaque Collection { ^~~~~~~~ <stdin>:1:24: error: 'Collection' cannot be constructed because it has no accessible initializers func foo() -> __opaque Collection { ^ <stdin>:1:24: error: protocol 'Collection' can only be used as a generic constraint because it has Self or associated type requirements func foo() -> __opaque Collection { ^
(edited)