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+Require Import Coq.extraction.Extraction.
+Require Import Coq.extraction.ExtrHaskellString.
+Extraction Language Haskell.
+Set Extraction File Comment "IMPORTANT: If you change this file, make sure that running [cp Extraction_Haskell_String_12258.out Extraction_Haskell_String_12258.hs && ghc -o test Extraction_Haskell_String_12258.hs] succeeds".
+Inductive output_type_code :=
+| ascii_dec
+| ascii_eqb
+| string_dec
+| string_eqb
+| byte_eqb
+| byte_eq_dec
+.
+
+Definition output_type_sig (c : output_type_code) : { T : Type & T }
+  := existT (fun T => T)
+            _
+            match c return match c with ascii_dec => _ | _ => _ end with
+            | ascii_dec => Ascii.ascii_dec
+            | ascii_eqb => Ascii.eqb
+            | string_dec => String.string_dec
+            | string_eqb => String.eqb
+            | byte_eqb => Byte.eqb
+            | byte_eq_dec => Byte.byte_eq_dec
+            end.
+
+Definition output_type (c : output_type_code)
+  := Eval cbv [output_type_sig projT1 projT2] in
+      projT1 (output_type_sig c).
+Definition output (c : output_type_code) : output_type c
+  := Eval cbv [output_type_sig projT1 projT2] in
+      match c return output_type c with
+      | ascii_dec as c
+      | _ as c
+        => projT2 (output_type_sig c)
+      end.
+
+Axiom IO_unit : Set.
+Axiom _IO : Set -> Set.
+Axiom _IO_bind : forall {A B}, _IO A -> (A -> _IO B) -> _IO B.
+Axiom _IO_return : forall {A : Set}, A -> _IO A.
+Axiom cast_io : _IO unit -> IO_unit.
+Extract Constant _IO "a" => "GHC.Base.IO a".
+Extract Inlined Constant _IO_bind => "(Prelude.>>=)".
+Extract Inlined Constant _IO_return => "GHC.Base.return".
+Extract Inlined Constant IO_unit => "GHC.Base.IO ()".
+Extract Inlined Constant cast_io => "".
+
+Definition main : IO_unit
+  := cast_io (_IO_bind (_IO_return output)
+                       (fun _ => _IO_return tt)).
+
+Recursive Extraction main.