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Proof step 19 from proof fits-subset (previous step)

is_obj(str, r, st0), st0[r -- _type] .type = mkclasstype(class), st0[r -- sk] = refval(r0), r -- _type ∈ st0, is_obj(str, r, st0), st0 ⊆ st, fits(r0, sks0, st), sk ∈ instfields(class), r ∈ st0, r -- sk ∈ st0, junkref(str, r0, st0) ⊦ r = jvmref, ∃ fs. fs ' ∈ instfields(st0[r -- _type] .type .class) ∧ is_referencevalue(st0[r -- fs ']) ∧ st0[r -- fs '] .refval ≠ jvmref ∧ (¬ st0[st0[r -- fs '] .refval -- _type] .type ≤ fs .type ∨ junkref(str, st0[r -- fs '] .refval, st0)), fits(r0, sks0, st0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 18:
st0[r -- sk] = refval(r0), st0[r -- _type] .type = mkclasstype(class), junkref(str, r0, st0), r -- sk ∈ st0, r ∈ st0, sk ∈ instfields(class), fits(r0, sks0, st), st0 ⊆ st, is_obj(str, r, st0), r -- _type ∈ st0 ⊦ r = jvmref, fits(r0, sks0, st0), ∃ fs. fs ' ∈ instfields(class) ∧ is_referencevalue(st0[r -- fs ']) ∧ st0[r -- fs '] .refval ≠ jvmref ∧ (¬ st0[st0[r -- fs '] .refval -- _type] .type ≤ fs .type ∨ junkref(str, st0[r -- fs '] .refval, st0))

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkclasstype(class) .class = class])]]