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Proof step 13 from proof is_obj-put-equiv (previous step)

r1 ∈ st, okval(val, ty), r1 -- mkfs(class, ty, fieldvar) ' ∈ st, okval(st[r1 -- mkfs(class, ty, fieldvar) '], ty) ⊦ class+∃(str, st[r1 -- _type] .type .class) ∧ ¬ is_abstract(st[r1 -- _type] .type .class) ∧ is_obj(r1, st[r1 -- mkfs(class, ty, fieldvar) ', val]) ↔ is_obj(str, r1, st), ty = void_type

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 9:
⊦ is_obj(str, r, st) ↔ class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ is_obj(r, st)
Proof step 12:
r1 ∈ st, okval(val, ty), r1 -- mkfs(class, ty, fieldvar) ' ∈ st, okval(st[r1 -- mkfs(class, ty, fieldvar) '], ty) ⊦ class+∃(str, st[r1 -- _type] .type .class) ∧ ¬ is_abstract(st[r1 -- _type] .type .class) ∧ is_obj(r1, st[r1 -- mkfs(class, ty, fieldvar) ', val]) ↔ class+∃(str, st[r1 -- _type] .type .class) ∧ ¬ is_abstract(st[r1 -- _type] .type .class) ∧ is_obj(r1, st), ty = void_type

Rule argument

[crewrite-arg: is-real-object-def, F, [st, r, str] → [st, r1, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r1, str)]]