How to see code of Monad Reader?

Question

I am a beginner in Haskell, and I want to understand Reader Monad. I know how to use this monad. But I want to see the implementation of monad (particularly code of function "return"). How can I see this code?

Answer 1

Answered in the comments by pdexter :

The definition is here but I would recommend reading the simplified version here .

Answer 2

I have downloaded the ghc source from here It contains the definition of all the base functions Then I open the folder in Sublime text editor which will index the source files. Then you can type F12 on a function or Ctrl+Shift+F to find the implementation. You can jump back with Alt+- .

I actually downloaded many other Haskell libraries for easy reference.