Herbie works on SubHask expressions

.gitmodules

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+[submodule "herbie"]
+	path = herbie
+	url = ./herbie

LICENSE

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+Copyright (c) 2015, Mike Izbicki
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Mike Izbicki nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Setup.hs

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+import Distribution.Simple
+main = defaultMain

herbie-haskell.cabal

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+-- Initial herbie-haskell.cabal generated by cabal init.  For further
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+-- The name of the package.
+name:                herbie-haskell
+
+-- The package version.  See the Haskell package versioning policy (PVP)
+-- for standards guiding when and how versions should be incremented.
+-- http://www.haskell.org/haskellwiki/Package_versioning_policy
+-- PVP summary:      +-+------- breaking API changes
+--                   | | +----- non-breaking API additions
+--                   | | | +--- code changes with no API change
+version:             0.1.0.0
+
+-- A short (one-line) description of the package.
+synopsis:            automatically improve your code's numeric stability
+
+-- A longer description of the package.
+-- description:
+
+-- URL for the project homepage or repository.
+homepage:            github.com/mikeizbicki/herbie-haskell
+
+-- The license under which the package is released.
+license:             BSD3
+
+-- The file containing the license text.
+license-file:        LICENSE
+
+-- The package author(s).
+author:              Mike Izbicki
+
+-- An email address to which users can send suggestions, bug reports, and
+-- patches.
+maintainer:          [email protected]
+
+-- A copyright notice.
+-- copyright:
+
+category:            Math
+
+build-type:          Simple
+
+-- Extra files to be distributed with the package, such as examples or a
+-- README.
+-- extra-source-files:
+
+-- Constraint on the version of Cabal needed to build this package.
+cabal-version:       >=1.10
+
+
+library
+  -- Modules exported by the library.
+  exposed-modules:
+    Herbie
+
+  -- Modules included in this library but not exported.
+  -- other-modules:
+
+  -- LANGUAGE extensions used by modules in this package.
+  -- other-extensions:
+
+  -- Other library packages from which modules are imported.
+  build-depends:        base >=4.8 && <4.9
+                      , ghc
+                      , template-haskell
+                      , hermit >= 1.0.0.0
+                      , process >= 1.1.0.0
+
+  -- Directories containing source files.
+  hs-source-dirs:      src
+
+  -- Base language which the package is written in.
+  default-language:    Haskell2010
+