Tweak list filter & infer method alt 2x [ci: last-only] #11130
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Note that Scala 2 inlines filter into filterNot.
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More compact filter method is more amenable to inlining.
Scala 2 inlines filter in filterNot, obviating the previous flip flag to negate the predicate.
Tweak to infer method alt was to reduce method calls, but nothing is proven yet about improving.
(Something about
alt.filter(isAltApplicable)which callsctx.inSilentMode(isApplicable). The tweak wraps the whole filter ininSilentModewith reporter reset on error. There is a comment about inliner and code structure, to be understood.)