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Proof step 24 from proof validrefs-put-badclassfield (previous step)

is_obj(str, r, st), st[r0 -- _type] .type = mkclasstype(class), st[r -- mkfs(class0, ty0, fieldvar) '] = refval(r1), junkref(str, r1, st), validrefs(str, r1 ' + refs, ty0, st[r0 -- fs ', val]), mkfs(class0, ty0, fieldvar) ' ∈ instfields(st[r -- _type] .type .class), is_obj(str, r, st[r0 -- fs ', val]), st[r -- _type] .type ≤ ty, is_obj(str, r, st), r ≠ r0 ∨ mkfs(class0, ty0, fieldvar) ≠ fs ⊦ fs ' = _type, r = jvmref, dups((r1 ' + refs) .butlast), r ∈ (r1 ' + refs) .butlast, fs ' ∈ instfields(class), ∃ fs. fs ' ∈ instfields(st[r -- _type] .type .class) ∧ is_referencevalue(st[r -- fs ']) ∧ st[r -- fs '] .refval ≠ jvmref ∧ (¬ st[st[r -- fs '] .refval -- _type] .type ≤ fs .type ∨ junkref(str, st[r -- fs '] .refval, st)), validrefs(str, r1 ' + refs, ty0, st)

User applied rule exists right

And closed the goal!

Rule argument

[EXRARG : pos: right 6, [extquanttermlist: (mkfs(class0, ty0, fieldvar)) abort:F , discard:T , computed:T ]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ mkfs(class, ty, fieldvar) .type = ty], [CSIMPSEQ : ⊦ is_referencevalue(refval(r))], [CSIMPSEQ : ⊦ refval(r) .refval = r], [CSIMPSEQ : ⊦ ¬ junkref(str, jvmref, st)])], [EXTRATERMS : (mkfs(class0, ty0, fieldvar))]]