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Proof step 7 from proof is_valid_ref-put-samefield-01 (previous step)

okval(val, ty), class+∃(str, st[r -- _type] .type .class), is_obj(r, st) ⊦ mkfs(class, ty, fieldvar) ' = _type, mkfs(class, ty, fieldvar) ' = _length, is_array(str, r, st), is_abstract(st[r -- _type] .type .class), is_obj(r, st[r -- mkfs(class, ty, fieldvar) ', val])

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
⊦ is_obj(r, st) ∧ oktype(val, fs .type, st) ∧ fs ' ≠ _type → is_obj(r, st[r -- fs ', val])

Rule argument

[crewrite-arg: isobj-put-samefield-03 , F , [val, fs, st, r] → [val, mkfs(class, ty, fieldvar), st, 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, r)]]