Yang, Bo

Hopefully it would fix CI failures in https://github.com/scalaz/scalaz/runs/5795544306?check_suite_focus=true

`Trampoline` was introduced into `Cofree` in #702 for stack safety. However, #702 also excludes the data structures where the stack safety does not matter. For example, we cannot let `Tree`...

Add stack-safe type class instances for ContsT

6

Allow stack-safe `ContT` mentioned in https://github.com/scalaz/scalaz/pull/1368#issuecomment-297921691

Add Traverse type class instance for Free.Source

2

This PR is a cherry pick from #1159

Add UnitSourceInstance

2

This type class instance treats `Source[?, Unit]` as a collection

Witness should provide the evidence of `value.type =:= T`

7

Suppose we are creating a XML processing library, we want to ensure all the methods in a XML document only applies to elements that belong to the document. We can...

`RecordArgs` and `ProductArgs` does not support apply method

2

Upstream bug: https://github.com/scala/bug/issues/10307 ``` scala final class PartiallyAppliedNewInstance[Result] extends RecordArgs { def applyRecord[Vals](vals: Vals): Result = { ??? } } /** @usecase def newInstance[Result](vals: Any*): Result */ def newInstance[Result]: PartiallyAppliedNewInstance[Result]...