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.. _type-class-extensions:
Class and instances declarations
================================
This section documents GHC's type-class extensions.
There's lots of background in the paper `Type classes: exploring the
design
space <https://research.microsoft.com/~simonpj/Papers/type-class-design-space/>`__
(Simon Peyton Jones, Mark Jones, Erik Meijer).
.. toctree::
:maxdepth: 1
multi_param_type_classes
undecidable_super_classes
constrained_class_methods
default_signatures
nullary_type_classes
functional_dependencies
instances
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