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Add support for built-in Natural literals in Core.
- Replace MachInt,MachWord, LitInteger, etc. with a single LitNumber
constructor with a LitNumType field
- Support built-in Natural literals
- Add desugar warning for negative literals
- Move Maybe(..) from GHC.Base to GHC.Maybe for module dependency
reasons
This patch introduces only a few rules for Natural literals (compared
to Integer's rules). Factorization of the built-in rules for numeric
literals will be done in another patch as this one is already big to
review.
Test Plan:
validate
test build with integer-simple
Reviewers: hvr, bgamari, goldfire, Bodigrim, simonmar
Reviewed By: bgamari
Subscribers: phadej, simonpj, RyanGlScott, carter, hsyl20, rwbarton,
thomie
GHC Trac Issues: #14170, #14465
Differential Revision: https://phabricator.haskell.org/D4212
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