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Proof step 20 from proof readpage-get (previous step)

# buf = VFS_PAGE_SIZE, files[m] = mkfile(m3, md0, m4, content), m ∈ files ⊦ [fail#(; ; err)] (err = ESUCCESS ∧ buf = getpage(n, content) ∨ ⌊err⌋ )

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 21:
# buf = VFS_PAGE_SIZE, files[m] = mkfile(m3, md0, m4, content), m ∈ files ⊦ [choose err0 with ⌊err0⌋ in err := err0] (err = ESUCCESS ∧ buf = getpage(n, content) ∨ ⌊err⌋ )

Rule argument

pos: right 1

Additional information

Used simplifier rules: fail#(; ; ERR){choose ERR0 with ⌊ERR0⌋ in ERR := ERR0};