[isabelle] Problems with Code-Generator

Dear list,

we just stumbled upon the translation of pattern matching of natural numbers for code-generation in the presence of target-language integers.

theory Test
fun foo :: "nat â bool" where
  "foo (Suc 0) = True"
export_code foo in Haskell

(* "Nat.Suc" is not a constructor, on left hand side of equation, in theorem:
foo (Suc zero_nat_inst.zero_nat) â True *)


Of course, it is easy to work around by providing suitable code-equations manually, but perhaps this can be fixed in the future. 
The problem occurs in both Isabelle 2016 and in the development version d4b89572ae71.

Akihisa and Renà 

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