Re: [isabelle] Tracing the simplifier in proofs

Hi John,

> I tried this series of commands within my proof:
>   ML "trace_simp := true"
>   apply simp
>   ML "trace_simp := false"

use "ML_val" instead of "ML";  "ML" is a theory-context sensitive
command and can only be used at the theory toplevel.

Note further that the Isabelle library provides set/reset combinators,
so just write

>   ML_val "set trace_simp"
>   apply simp
>   ML_val "reset trace_simp"

Hope this helps



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