David McHealy

David McHealy has asked 27 questions and find answers to 8 problems.

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David McHealy questions

Join two consumers into a single consumer that returns multiple values?
Adding type signature to where statement causes error I don't understand
In aeson, how do you encode from a Value without resulting in scientific notation?
How to turn a pull based pipe into a push based one?
How to update a map but only when key already exists
Type annotation in a pattern match in Rust?
How do you use parsec in a greedy fashion?
Could not deduce KnownNat in two existentials with respect to the singletons library
I can't seem to figure out type variables mixed with classes
How to use Control.Monad.State with Parsec?

David McHealy answers

Could not deduce KnownNat in two existentials with respect to the singletons library
Link to a static file from Hamlet
Lens package with algebraic types
How to convert from happs -> happstack?
How to read Yesod error messages effectively?
Unit testing IO actions with Hspec