String constants in Haskell are values of type String. If you are using template-haskell-2.7.0.0 or later (i.e., GHC 7.4 or later), then derive-functions can be used with data family instances (which requires the -XTypeFamilies extension).

Utilities for GHC.Generics. Generic deriving for standard classes Example: generically deriving Semigroup instances for products. We see this tool as a competitor to DrIFT.

Generic data types in Haskell .

The tool requires GHC, but the generated code is portable to all compilers.

class IsString a where Source # Class for string-like datastructures; used by the overloaded string extension (-XOverloadedStrings in GHC). fix f is the least fixed point of the function f, i.e.

the least defined x such that f x = x.. For example, we can write the factorial function using direct recursion as >>> let fac n = if n <= 1 then 1 else n * fac (n-1) in fac 5 120 This uses the fact that Haskell’s let introduces recursive bindings.

It is designed to work with custom derivations, SYB and Template Haskell mechanisms. to deriveFoldable . Data.Derive is a library and a tool for deriving instances for Haskell programs. ## Motivation GHC gives nice warnings when a data definition isn't used at all.

I think technically it must be feasible at least through Template Haskell. So I asking for details. They can overlap, but here I want GHC to derive a hidden Arbitrary instance for Name during deriving Arbitrary for UserAr recursively.

Semi-automatic method using gmappend. To do so, pass the Name of a data or newtype instance constructor (NOT a data family name!) Such Arbitrary instance for Name should inside Arbitrary for UserAr just like I would wrote it by hands.

data Foo a = Bar [a] [a] deriving Generic instance Semigroup (Foo a) where (<>) = gmappend

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