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Proof step 49 from proof junkref-class-01 (previous step)

st[r -- mkfs(class, ty, fieldvar) '] = refval(r0), is_reftype(ty), is_obj(str, r, st), mkfs(class, ty, fieldvar) ' ∈ instfields(st[r -- _type] .type .class) ⊦ ty = abstract_type, r0 = jvmref, st[r0 -- _type] .type ≤ ty, ∃ refs. refs ≠ [] ∧ refs .first = r ∧ junkrefs(str, refs, st[refs .first -- _type] .type, st)

User applied rule exists right

And obtained the following new goals

Proof step 48:
st[r -- mkfs(class, ty, fieldvar) '] = refval(r0), is_reftype(ty), is_obj(str, r, st), mkfs(class, ty, fieldvar) ' ∈ instfields(st[r -- _type] .type .class) ⊦ ty = abstract_type, r0 = jvmref, st[r0 -- _type] .type ≤ ty, r ' + r0 ≠ [] ∧ (r ' + r0) .first = r ∧ junkrefs(str, r ' + r0, st[(r ' + r0) .first -- _type] .type, st)

Rule argument

[EXRARG : pos: right 4, [extquanttermlist: (r ' + r0)abort:F, discard:T, computed:F]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r ' + r0)]]