drscheme:unit:get-program-editor-mixin in DrScheme Tools Functions
(drscheme:unit:get-program-editor-mixin) -> ((subclass?/c text%) . -> . (subclass?/c text%))
Returns a mixin that must be mixed in to any
text% object that might contain
program text (and thus can be in the source
field of some syntax object).
See also
drscheme:unit:add-to-program-editor-mixin.