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[Jonathan <jonikelee AT gmail.com>]

On 05/08/2014 11:05 AM, Marcus Ramos wrote:
> Dear All,
>
> When I use the "simpl" tactic in a goal, it changes a subterm of the form
> "c ++ s", with c: ascii and s: string, into "String c s" (String is a
> constructor of the type string). How can I prevent simpl from doing this?
>
> Thanks in advance,
> Marcus.

You can make the string append function "++" be opaque to simpl with the 
declaration: Opaque append.

-- Jonathan