src/Doc/Implementation/Proof.thy

   @{define_ML Variable.declare_term: "term -> Proof.context -> Proof.context"} \\
   @{define_ML Variable.declare_constraints: "term -> Proof.context -> Proof.context"} \\
   @{define_ML Variable.export: "Proof.context -> Proof.context -> thm list -> thm list"} \\
   @{define_ML Variable.polymorphic: "Proof.context -> term list -> term list"} \\
   @{define_ML Variable.import: "bool -> thm list -> Proof.context ->
-  ((ctyp Term_Subst.TVars.table * cterm Term_Subst.Vars.table) * thm list)
+  ((ctyp TVars.table * cterm Vars.table) * thm list)
     * Proof.context"} \\
   @{define_ML Variable.focus: "binding list option -> term -> Proof.context ->
   ((string * (string * typ)) list * term) * Proof.context"} \\
   \end{mldecls}