Outputable package:ghc
This module defines classes and functions for pretty-printing. It also
exports a number of helpful debugging and other utilities such as
trace and
panic.
The interface to this module is very similar to the standard Hughes-PJ
pretty printing module, except that it exports a number of additional
functions that are rarely used, and works over the
SDoc type.
Class designating that some type has an
SDoc representation
Constraint type to bundle up the requirement for
OutputableBndr
on both the
id and the
NoGhcTc of it. See Note
[NoGhcTc].
When we print a binder, we often want to print its type too. The
OutputableBndr class encapsulates this idea.
Outputable class with an additional environment value
See Note [The OutputableP class]