(app-type-error {:keys [fexpr args fin arg-ret-types expected poly? opts]})
(domain-subtype? l r arg-ret-types opts)
(plainapp-type-error fexpr args fexpr-type arg-ret-types expected opts)
(polyapp-type-error fexpr args fexpr-type arg-ret-types expected opts)
(trim-arities arities arg-ret-types opts)
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