Simpler inference for tracked #22972
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KacperFKorban
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odersky
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Aug 21, 2025
| lazy val isRefInSignatures = | ||
| psym.maybeOwner.isPrimaryConstructor | ||
| && isReferencedInPublicSignatures(psym) | ||
| lazy val needsTrackedSimp = needsTrackedSimple(psym, param, owningSym) |
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I don't see why you need a lazy val here? A def would do as weell and be more efficient? Or just inline the rhs.
| && psym.info.memberNames(abstractTypeNameFilter).nonEmpty | ||
| && !accessorSyms.exists(_.is(Mutable)) | ||
| && (param.hasAttachment(ContextBoundParam) || accessorSyms.exists(!_.isOneOf(PrivateLocal))) | ||
| && psym.infoDontForceAnnotsAndInferred(param).memberNames(abstractTypeNameFilter).nonEmpty |
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Why not: abstractTypeNames.nonEmpty?
| sym.infoOrCompleter match | ||
| case tpe if tree.mods.annotations.nonEmpty => tpe | ||
| case tpe: LazyType if tpe.isExplicit => sym.info | ||
| case tpe if sym.isType => sym.info |
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Is this not rendundant wrt the last line?
| acc(false, tpe) | ||
| private def infoDontForceAnnotsAndInferred(tree: DefTree)(using Context): Type = | ||
| sym.infoOrCompleter match | ||
| case tpe if tree.mods.annotations.nonEmpty => tpe |
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Can we find a more finegrained exclusion that avoids the NoSymbol?
| @@ -0,0 +1,6 @@ | |||
| import scala.language.experimental.modularity | |||
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Would be good to add some more tests that exercise the precise conditions that infer tracked.
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Break out code for testing tracked inference independently of x.modularity
Check parameters whether they need to be tracked only under x.modularity.
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odersky
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Oct 13, 2025
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Summary of changes over original PR:
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Change
trackedinference to simpler heuristic: always infertrackedfor a parameter if its type has an abstract type member.Tested it with
modularityturned on and the only bug I noticed was eager typing of annotations, which I patched by not inferringtrackedfor annotated parameters.