Doug Gregor 9fa2a8bdca Don’t create a new generic signature builder for non-generic members. ...

When type-checking a function or subscript that itself does not have generic
parameters (but is within a generic context), we were creating a generic
signature builder which will always produce the same generic signature as
the enclosing context. Stop creating that generic signature builder.

Instead, teach the CompleteGenericTypeResolver to use the generic signature
+ the canonical generic signature builder for that signature to resolve
types, which also eliminates some extraneous re-type-checking.

Improves type-checking performance of the standard library by 36%.

2017-09-24 22:23:00 -07:00

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