GHC Handbook

Note [Rebindable syntax and XXExprGhcRn]

GHC/Hs/Expr.hs:1314 compiler 

We implement rebindable syntax (RS) support by performing a desugaring
in the renamer. We transform GhcPs expressions and patterns affected by
RS into the appropriate desugared form, but **annotated with the original
expression/pattern**.

Let us consider a piece of code like:

    {-# LANGUAGE RebindableSyntax #

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