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Proof step 6 from proof validref-levelsubset (previous step)

r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st), level⊆(str, str0) ⊦ validref(str0, r, ty, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ validref(str, jvmref, ty, st)
Proof step 5:
level⊆(str, str0), st[r -- _type] .type ≤ ty ⊦ r = jvmref, validref(str0, r, ty, st), junkref(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]