[isabelle] proof terms & program extraction

Dear all,

I'd like to try out the Isabelle program extraction mechanism "extract",
but I have been unsuccessful so far.

I found examples for this mechanism in
Isabelle2014/src/HOL/Proofs/Extraction, but trying e.g. Euclid.thy, I get
the error "reconstruct_proof: minimal proof object" on the line "extract

I found some information on that (maybe explicit proof terms have not been
generated by Isabelle?), but it seems outdated: [1] gives a solution to the
problem, but I could not apply that to the current version of Isabelle
("Isabelle -> Settings -> Full Proofs" does not exist in the jEdit IDE, the
"usedir" tool does not exist anymore, ...)

I'd really appreciate any pointers on how to use this feature with the
current version of Isabelle.


[1] https://groups.google.com/forum/#!topic/fa.isabelle/rASlPIW8i_Y

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