| unchanged(str, r, st, st1), junkrefs(str, r ' + refs0, st1[r -- _type] .type, st1) ⊦ junkrefs(str, r ' + refs0, st[r -- _type] .type, st) |
⊦ unchanged(str, refs .first, st, st1) ∧ ¬ junkrefs(str, refs, ty, st) → ¬ junkrefs(str, refs, ty, st1)
¬ (unchanged(str, (r ' + refs0) .first, st, st1) ∧ ¬ junkrefs(str, r ' + refs0, st1[r -- _type] .type, st)), unchanged(str, r, st, st1), junkrefs(str, r ' + refs0, st1[r -- _type] .type, st1) ⊦ junkrefs(str, r ' + refs0, st[r -- _type] .type, st)
[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, st1, st1[r -- _type] .type, r ' + refs0, str)]]