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Published 20 hours ago • verified publisher icon crystal-lang

Instance variable '@callback' of Foo must be (Proc((T | Nil)) | Nil), not Proc(Nil)

Open Sija opened this issue 9 years ago • 7 comments

Hi, I cannot wrap my head around below piece of code... What am I doing wrong? https://carc.in/#/r/16r0

Sija avatar Aug 10 '16 02:08 Sija