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Proof step 49 from proof pathexplus-pathex (previous step)

validrefs(str, r ' + refs1, mkclasstype(`java.lang.Object' .class), st) ⊦ refs1 = [], r = refs1 .last, validrefs(str, r ' + refs1 .butlast, mkclasstype(`java.lang.Object' .class), st) ∧ step∃(str, (r ' + refs1 .butlast) .last, refs1 .last, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty) → ¬ validrefs(str, r ' + refs, ty, st)
Proof step 48:
¬ (r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ mkclasstype(`java.lang.Object' .class))), validrefs(str, r ' + refs1, mkclasstype(`java.lang.Object' .class), st) ⊦ refs1 = [], r = refs1 .last, validrefs(str, r ' + refs1 .butlast, mkclasstype(`java.lang.Object' .class), st) ∧ step∃(str, (r ' + refs1 .butlast) .last, refs1 .last, st)

Rule argument

[crewrite-arg: validrefs-is-junk , F , [st, ty, refs, r, str] → [st, mkclasstype(`java.lang.Object' .class), refs1, r, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, mkclasstype(`java.lang.Object' .class), refs1, r, str)]]