Doug Gregor a23a4353cb [Type checker] Requestify the formation of an abstract generic signature ...

Introduce a request to form an abstract generic signature given a
base signature, additional generic parameters, and additional
requirements. It is meant to provide a caching layer in front of the
generic signature builder.

Switch one direct client of the generic signature builder over to this
mechanism, the formation of a generic signature for an existential
type.

2019-08-26 09:54:19 -07:00

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