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Proof step 19 from proof validrefkeynotnull-union (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 18:
st[rk] = refval(r), rk ∈ st, st[r -- _type] .type ≤ ty ⊦ r = jvmref, junkref(str, r, st), validref(str, r, ty, st0 ∪ st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]