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Fix #19202: Passing NotNullInfos to a mutable field of a Completer #19463

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noti0na1
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Fix #19202

Completing a Def requires the new NotNullInfos from previous statements.
Originally, we created a new Completer with the new creation ctx in adaptCreationContext.
However, we should not create a regular Completer for TypeDefs.

This PR fixes the issue by creating a mutable field for NotNullInfos in Completer,
and the field is updated in adaptCreationContext now.

There may be a better solution without the mutable field.

@dwijnand
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Shall we try giving all the completers a newLikeThis method?

@smarter
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smarter commented Jan 16, 2024

Yeah that might be the most sensible approach here, ideally we'd have a base class AbstractCompleter that keeps it abstract too

@smarter
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smarter commented Jan 16, 2024

(or keep Completer with the same name but make it abstract and add a concrete Term completer?)

@noti0na1
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noti0na1 commented Jan 17, 2024

LazyType, Completer and its subclasses (ClassCompleter and TypeDefCompleter) all have private mutable fields,
which makes it difficult to manage the copy and inti.

So, I think it is ok to keep NotNullInfos as a mutable field for now.

@noti0na1 noti0na1 force-pushed the create-correct-completer-when-passing-notnullinfos branch from b4a293e to bc057db Compare January 19, 2024 00:00
@@ -784,12 +785,18 @@ class Namer { typer: Typer =>

protected def localContext(owner: Symbol): FreshContext = ctx.fresh.setOwner(owner).setTree(original)

private var myNotNullInfos: List[NotNullInfo] | Null = null

/** The context with which this completer was created */
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The comment should mention that this is affected by setNotNullInfos

@noti0na1 noti0na1 merged commit 0b7a785 into scala:main Jan 19, 2024
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@noti0na1 noti0na1 deleted the create-correct-completer-when-passing-notnullinfos branch January 19, 2024 12:57
@Kordyjan Kordyjan added this to the 3.4.1 milestone Feb 14, 2024
WojciechMazur added a commit that referenced this pull request Jun 28, 2024
…mpleter" to LTS (#20841)

Backports #19463 to the LTS branch.

PR submitted by the release tooling.
[skip ci]
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scala.MatchError dotty.tools.dotc.typer.Namer$Completer.typeSig(Namer.scala:798)
4 participants