Require Coq.extraction.Extraction. Module Type TRIVIAL. Parameter t:Type. End TRIVIAL. Module MkStore (Key : TRIVIAL). Module St : TRIVIAL. Definition t := unit. End St. End MkStore. Module Type CERTRUNTIMETYPES (B : TRIVIAL). Parameter cert_fieldstore : Type. Parameter empty_fieldstore : cert_fieldstore. End CERTRUNTIMETYPES. Module MkCertRuntimeTypes (B : TRIVIAL) : CERTRUNTIMETYPES B. Module FieldStore := MkStore B. Definition cert_fieldstore := FieldStore.St.t. Axiom empty_fieldstore : cert_fieldstore. End MkCertRuntimeTypes. Extraction MkCertRuntimeTypes. (* Was leading to an uncaught Not_found *) Extraction TestCompile MkCertRuntimeTypes.