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Proof step 21 from proof validrefs-lastelem (previous step)

is_obj(r0, st), st[r0 -- mkfs(class, ty0, fieldvar) '] = refval(r1), mkfs(class, ty0, fieldvar) ' ∈ instfields(st[r0 -- _type] .type .class), st[r0 -- _type] .type ≤ ty, is_obj(str, r0, st), validrefs(str, r1 ', ty0, st) ⊦ r0 = jvmref, mkfs(class, ty0, fieldvar) ' ∈ instfields(st[r0 -- _type] .type .class) ∧ is_reftype(mkfs(class, ty0, fieldvar) .type)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 20:
st[r0 -- mkfs(class, ty0, fieldvar) '] = refval(r1), is_obj(r0, st), mkfs(class, ty0, fieldvar) ' ∈ instfields(st[r0 -- _type] .type .class), st[r0 -- _type] .type ≤ ty, is_obj(str, r0, st), validrefs(str, r1 ', ty0, st) ⊦ r0 = jvmref, is_reftype(ty0)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkfs(class, ty, fieldvar) .type = ty])]]