drscheme:language:get-default-mixin in DrScheme Tools Functions

• (drscheme:language:get-default-mixin) -> ((implementation?/c drscheme:language:language<%>) . ->d . (λ (%) (subclass?/c %)))

  This function can only be called in phase 2.

  The result of this function is the composite of all of the default-implementation arguments passed to drscheme:language:extend-language-interface.