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Proof step 7 from proof validref-class-rec-better-keep (previous step)

fs = mkfs(class, ty0, fieldvar), is_obj(str, r, st), validref(str, r, ty, st) ⊦ st[r -- _type] .type ≤ ty ∧ ( ¬ fs ' ∈ instfields(st[r -- _type] .type .class) ∨ ¬ is_referencevalue(st[r -- fs ']) ∨ st[r -- fs '] .refval = jvmref ∨ st[st[r -- fs '] .refval -- _type] .type ≤ ty0 ∧ validref(str, st[r -- fs '] .refval, ty0, st))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
is_obj(str, r, st), validref(str, r, ty, st) ⊦ st[r -- _type] .type ≤ ty ∧ ( ¬ mkfs(class, ty0, fieldvar) ' ∈ instfields(st[r -- _type] .type .class) ∨ ¬ is_referencevalue(st[r -- mkfs(class, ty0, fieldvar) ']) ∨ st[r -- mkfs(class, ty0, fieldvar) '] .refval = jvmref ∨ st[st[r -- mkfs(class, ty0, fieldvar) '] .refval -- _type] .type ≤ ty0 ∧ validref(str, st[r -- mkfs(class, ty0, fieldvar) '] .refval, ty0, st))

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]