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debug-trace-var
When writing print debug, we often write.
import Debug.Trace main :: IO () main = do let a = 1 traceIO $ "a = " ++ show a This is troublesome to describe the name of the variable twice.
With debug-trace-var you write variables only once.
{-# LANGUAGE QuasiQuotes #-} import Debug.Trace.Var main :: IO () main = do let a = 1 [traceVarIO|a|] or
{-# LANGUAGE TemplateHaskell #-} import Debug.Trace.Var main :: IO () main = let a = 1 :: Int in $(traceMTH 'a) You may avoid name quotes that are confusing with character literals, Or often it may be to avoid the QuasiQuotes to destroy the syntax highlight of the text editor.
Example
{-# LANGUAGE QuasiQuotes #-} {-# LANGUAGE TemplateHaskell #-} import Debug.Trace.Var -- > a -- n = 1 -- s = "あ" a :: IO () a = let n = 1 s = "あ" in [traceVar|n|] ([traceVar|s|] return ()) -- > b -- "n = 1 -- n = 1" b :: String b = let n = 1 in [traceVarId|n|] -- > c -- n = 344 c :: IO () c = let n = 344 in [traceStackVar|n|] (return ()) -- > d -- n = 344 -- n = 344 d :: IO () d = do let n = 344 [traceVarIO|n|] [traceVarIO|n|] -- > e -- n = 344 e :: IO () e = do let n = 344 [traceVarM|n|] -- > f -- n = 344 f :: IO () f = let n = 344 in $(traceMTH 'n) Motivation
I wanted to use Template Haskell.
One point advice
You can use ndmitchell/debug: Haskell library for debugging