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Make fromTo and friends return VWord when appropriate #1436

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Sep 17, 2022
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RyanGlScott
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Previous, fromTo and related functions would always return a VSeq. If the type happened to be a Bit, this would violate the internal invariant that sequences of Bits are always represented with VWords, leading to the panics observed in #1435. This patch fixes the issue by using the mkSeq smart constructor, which chooses between VWord and VSeq depending on the sequence type.

Fixes #1435.

Previous, `fromTo` and related functions would always return a `VSeq`. If the
type happened to be a `Bit`, this would violate the internal invariant that
sequences of `Bit`s are always represented with `VWord`s, leading to the panics
observed in #1435. This patch fixes the issue by using the `mkSeq` smart
constructor, which chooses between `VWord` and `VSeq` depending on the sequence
type.

Fixes #1435.
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Looks good to me. Not for this PR, but I wonder how hard it would be to make the value type abstract, so that we ensure that this sort of bug doesn't happen. We could use pattern synonyms to expose just the patterns, not the constructors.

@RyanGlScott
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Not for this PR, but I wonder how hard it would be to make the value type abstract, so that we ensure that this sort of bug doesn't happen.

I've opened #1437 for this.

@RyanGlScott RyanGlScott merged commit 4367eee into master Sep 17, 2022
@RyanGlScott RyanGlScott deleted the T1435 branch September 17, 2022 14:48
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Panic - not a word value ccatV left and ccatV right
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