Comments (3)
Many readers will try this for themselves, in GHCi. The new behaviour should probably be explained.
I see value in additionally comparing the behaviours of files vs. GHCi.
Type defaulting is also at play: Read a => a
defaults to ()
.
TypeApplications come in handy in situations like this, but chapter 3 is probably a bit too early for introducing language extensions. On the other hand: GHC2021 implies TypeApplications, and is included and on by default since GHC 9.0.
from learnyouahaskell.github.io.
Isn't the example still quite appropriate (because the solution to the presented problem is an explicit typing annotation) but only needs updating and an explanation of the "no parse" error? Interested in your thoughts. Open to a complete rework of the example as well.
from learnyouahaskell.github.io.
Isn't the example still quite appropriate (because the solution to the presented problem is an explicit typing annotation)
I'd say yes, it is still appropriate. Not because the solution is the same though, but rather because read "4"
remains a reasonable query from the reader's perspective. Removal of this example would be a loss, I think.
Open to a complete rework of the example
It seems to me the old explanation mostly still holds up, and that only a bit about extended defaulting rules in GHCi needs be be woven through.
from learnyouahaskell.github.io.
Related Issues (15)
- Images on Amazon AWS HOT 5
- Suggest GHCup instead of Haskell Platform HOT 1
- image edges dark background HOT 2
- EPUB version? HOT 5
- Replace Comments about BMI HOT 3
- Bad layout on mobile HOT 3
- State monad HOT 1
- "Monoids" is outdated HOT 1
- "The Monad type class" is outdated HOT 1
- Prelude folds now apply to any Foldable
- Starting out: triangle example: Text and code doesn't fit image
- Typos in text HOT 4
- State monad + other monads defined in transformers are out of date HOT 1
- Use markdown sources HOT 6
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from learnyouahaskell.github.io.