fact: Record mixin_of (pval : {morphism (@sepT U) >-> V}) (psub : {morphism D >-> U}) := Mixin { base : SubPCM_st.mixin_of pval psub; _ : pval undef = undef}.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(eqtype fintype) pcm(options axioms prelude) pcm(pcm)