Slava Pestov e45b566642 GSB: Try harder to prove derivation via redundant requirements ...

Consider a signature with a conformance requirement, and two
identical superclass requirements, both of which make the
conformance requirement redundant.

The conformance will have two requirement sources, the explicit
source and a derived source based on one of the two superclass
requirements, whichever one was processed first.

If we end up marking the *other* superclass requirement as
redundant, we would incorrectly conclude that the conformance
was not redundant. Instead, if a derived source is based on a
redundant requirement, we can't just discard it right away;
instead, we have to check if that source could have been
derived some other way.

2021-05-07 18:43:57 -04:00

6.4 KiB

Raw Blame History

View Raw