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Proof step 5 from proof validrefs-put-badclassfield (previous step)

is_classtype(st[r0 -- _type] .type), is_valid_ref(str, r, st[r0 -- fs ', val]), st[r -- _type] .type ≤ ty ⊦ fs ' = _type, r = jvmref, fs ' ∈ instfields(st[r0 -- _type] .type .class), junkref(str, r, st), validrefs(str, r ', ty, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ validrefs(str, r ', ty, st) ↔ r = jvmref ∨ r ≠ jvmref ∧ is_valid_ref(str, r, st) ∧ st[r -- _type] .type ≤ ty

Rule argument

[crewrite-arg: validrefs-one, F, [st, ty, r, str] → [st, ty, r, str]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_valid_ref(str, r, st) ∧ r ≠ jvmref → junkref(str, r, st)])], [EXTRATERMS : (st, ty, r, str)]]