https://dotty.epfl.ch/docs/reference/overview.html says
Polymorphic Function Types generalize polymorphic methods to dependent function values and types. Current status: There is a proposal, and a prototype implementation, but the implementation has not been finalized or merged yet.
but the implementation has been merged (#4672)
and the outline at https://dotty.epfl.ch/docs/index.html doesn't mention them
cc @milessabin
This is intentional, they won't be documented until they're fully implemented (I still haven't implemented type inference for them).
Should we close since #10663 was merged?
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This is intentional, they won't be documented until they're fully implemented (I still haven't implemented type inference for them).