Doug Gregor bf7eea08da [Function builders] Infer function builder from a protocol requirement. ...

Allow a protocol requirement for a function or property to declare
a function builder. A witness to such a protocol requirement will
infer that function builder when all of the following are two:
* The witness does not explicitly adopt a function builder
* The witness is declared within the same context that conforms to the
protocol requirement (e.g., same extension or primary type declaration)
* The witness's body does not contain a "return" statement (since those
disable the function builder transform).

2020-05-24 23:18:18 -07:00

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