[isabelle] Calling Mixfix.pretty_mixfix


I'm trying to call Mixfix.pretty_mixfix in ML mode, but it complains
about Mixfix being not declared. Does anyone know why? In fact, I get
the error for all structures in Pure/Syntax. Is it somehow not
included in the image? Is there a setting somewhere I need to change?

Any help will be greatly useful. Thanks.

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