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Proof step 50 from proof completeness (previous step)

⊦ 〈build#(x; to)〉 (to = fail → (∀ t. x ≠ depths(t, 0)))

User applied rule call right

And obtained the following new goals

Proof step 1:
⊦
Proof step 49:
⊦ 〈x1 := x〉〈build_rec#(0; x, to)〉〈to0 := to, x0 := x ; if ¬ is_empty(x0) then to0 := fail〉 (to0 = fail → (∀ t. x1 ≠ depths(t, 0)))

Rule argument

[fmapos-arg: pos: right 1]

Additional information

[[CONCRETESIMPRULES : ()]]