Add a type-function for subtraction.
authorIavor S. Diatchki <iavor.diatchki@gmail.com>
Tue, 24 Sep 2013 13:14:15 +0000 (06:14 -0700)
committerIavor S. Diatchki <iavor.diatchki@gmail.com>
Tue, 24 Sep 2013 13:14:15 +0000 (06:14 -0700)
commit5cf366975f6917c98e82506c674ca6bb4f11336f
tree660a74a3db07d6d233e43b7dcb243db497954965
parente2da02d4f5120d6b6365181e9a20f8af93d0f76d
Add a type-function for subtraction.

This is used in the definition of `ToNat1` in the `base` library
(module GHC.TypeLits).
compiler/prelude/PrelNames.lhs
compiler/typecheck/TcTypeNats.hs