Description

To attain a changelog of this library between two arbitrary versions you ask git for a diff on this file. For example:

git diff v0.2.0..v0.2.6 -- FEATURES.md

Alternatively, you may obtain a diff between two versions via any online diffing service, such as this one.

Features

Use it with Debug.Trace: trace [d|x, y, z|] x
Use it with Test.QuickCheck: counterexample [d|x, y, z|]
Use it inside the IO monad: putStrLn [d|x, y, z|]
print out a variable let a = 1 in print [d|a|] outputing: (a) = 1
print out an expression print [d|1 + 2|] outputting: (1 + 2) = 3
refer to variables in the expression let a = [1..3] in print [d|map (+1) a|] outputing: (map (+1) a) = [2,3,4]
print out multiple expressions [d|1+2, 3+4|] -> "(1+2) = 3 (3+4) = 7"

tries a bit to line up expressions in columns.

main = do
  f 22
  f 333
  where f a = putStrLn [d|a, a+2|]

Outputs:

  (a) = 22          (a+2) = 24
  (a) = 333         (a+2) = 335

Support for expressions that contain commas inside them: An example: [d|1, [2, 3]|] -> "(1) = 1 ([2, 3]) = [2,3]"

If your expression is invalid Haskell, such as [d| ([)] |] the generated code will be invalid as well, but could be slightly transformed. If you get cryptic error messages because of this, please let us know by opening an issue on GitHub.

n/a