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Fix #13455: Also consider sealed classes closed sums #13483

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merged 5 commits into from Sep 23, 2021

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OlivierBlanvillain
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The warnings on master are incorrect: we know that no instance of SealedClass match the corresponding cases.
@OlivierBlanvillain OlivierBlanvillain marked this pull request as ready for review September 7, 2021 14:39
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After commenting in #13455, I'm more certain that you can't change this and not change the children side too, though I don't have the concrete counter-example to prove it.

This commit renames isClosedSum to isDecomposable, and moves that
function and the decompose function to where they are used locally.
The logic in question only makes sense at the precise point where it's
used (see the added comment), so having those two functions defined
locally helps to avoid confusion.
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A small typo (iiuc) but looks good to me now, thanks for the attention, @OlivierBlanvillain!

compiler/src/dotty/tools/dotc/core/TypeComparer.scala Outdated Show resolved Hide resolved
Co-authored-by: Dale Wijnand <dale.wijnand@gmail.com>
@OlivierBlanvillain OlivierBlanvillain merged commit abc11ac into scala:master Sep 23, 2021
@OlivierBlanvillain OlivierBlanvillain deleted the fix-13455 branch September 23, 2021 17:38
@dwijnand
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Even better. 💯

@Kordyjan Kordyjan added this to the 3.1.1 milestone Aug 2, 2023
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4 participants