style_check(+string)

Hi,

After upgrading from swipl 6.2.6 to 6.6.1, error messages are generated
when loading the CTT package (http://www.buch-kromann.dk/matthias/ctt/),
which uses PCE.

The first error occurs after the directive

    :- style_check(+string).

ERROR:
        Domain error: `style_name' expected, found `string'

The string specification is not mentioned in the reference manual of swipl (anymore) and I don't know its meaning.
I noticed the recent changes in the representation of strings.

After removing the style_check(+string) directives, an other error occurs after the call
    send(@ctt, cmd_tracer_new).

ERROR:
        file ->initialise: Argument 1 (path): `[name]' expected, found `@nil/constant'

May the latter error also be explained by recent changes to swipl? Can it be avoided?

Thanks for your help!

Piet

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