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Proof step 5 from proof isobj-put-samefield (previous step)

st[r -- _type] = typeval(mkclasstype(class0)), is_obj(r, class0, st[r -- mkfs(class, ty, fieldvar) ', val]), r -- _type ∈ st, r ∈ st, okval(val, ty), okval(st[r -- mkfs(class, ty, fieldvar) '], ty), r -- mkfs(class, ty, fieldvar) ' ∈ st ⊦ r = jvmref, mkfs(class, ty, fieldvar) ' = _type, is_obj(r, class0, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ r -- fs ' ∈ st ∧ oktype(st[r -- fs '], fs .type, st) ∧ oktype(val, fs .type, st) ∧ fs ' ≠ _type → (is_obj(r, class, st[r -- fs ', val]) ↔ is_obj(r, class, st))

Rule argument

[crewrite-arg: isobj-put-samefield-01 , F , [val, fs, st, class, r] → [val, mkfs(class, ty, fieldvar), st, class0, r] ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkfs(class, ty, fieldvar) .type = ty], [CSIMPSEQ : ⊦ oktype(val, ty, st) ↔ okval(val, ty)])], [EXTRATERMS : (val, mkfs(class, ty, fieldvar), st, class0, r)]]