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Proof step 12 from proof validref-union (previous step)

r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st) ⊦ validref(str, r, ty, st0 ∪ st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ validref(str, jvmref, ty, st)
Proof step 11:
st[r -- _type] .type ≤ ty ⊦ r = jvmref, validref(str, r, ty, st0 ∪ st), junkref(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]