Added zeroWidthSpec transformation #1891
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
I've changed the hard-coded strings for type constructors / |
christiaanb
approved these changes
Aug 6, 2021
A new transformation has been defined, which replaces lambda-bound variables for a zero-width value with the value itself in the body of the lambda. e.g. ```haskell data AB = A | B ab :: KnownNat n => Index n -> AB -> AB ab n A = if n > 0 then A else B ab n B = if n == 0 then B else A ``` would see the values of n in the function body be replaced with 0 (the only possible value of the type `Index 1`) ```haskell ab _ A = if 0 > 0 then A else B ab _ B = if 0 == 0 then B else A ``` the normalizer is then free to further normalize this to ```haskell ab _ _ = B ``` where previously it would not be able to improve this during normalization. Fixes #508
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
A new transformation has been defined, which replaces lambda-bound variables for a zero-width type with the only possible value of that type in the body of the lambda. e.g.
would see the values of n in the function body be replaced with 0 (the only possible value of the type
Index 1)the normalizer is then free to further normalize this to
where previously it would not be able to improve this during normalization.
Fixes #508
Still TODO: