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The user now has to manually load them, respectively via:
Require Extraction
Require Import FunInd
The "Import" in the case of FunInd is to ensure that the
tactics functional induction and functional inversion are indeed
in scope.
Note that the Recdef.v file is still there as well (it contains
complements used when doing Function with measures), and it also
triggers a load of FunInd.v.
This change is correctly documented in the refman, and the test-suite
has been adapted.
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The previous extraction of [Z.div] for Haskell did not properly handle
divide-by-zero. Fix it by introducing an explicit [if] statement in the
generated Haskell code.
Also, introduce a similar extraction rule for [Z.modulo], with the same
check for modulo-by-zero.
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This mirrors the existing extraction libraries for OCaml.
One wart: the extraction for [string] requires that the Haskell code
imports Data.Bits and Data.Char. Coq has no way to add extra import
statements to the extracted code. So we have to rely on the user to
somehow import these libraries (e.g., using the -pgmF ghc option).
See also https://coq.inria.fr/bugs/show_bug.cgi?id=4189
Message to github robot: this commit closes #65
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Pierre Letouzey
Nickolai Zeldovich