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Proof step 1 from proof inv-fsyncdir (conclusion)

⊦ ⟪posix_fsyncdir#(path, psynced, user; ; psynced0, err)⟫ true

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 2:
⊦
Proof step 3:
psynced0 ↔ psynced ⊦ ⟪fail_or_success#(; ; err); psynced := ?⟫ true

Rule argument

pos: right 1

Additional information

Used simplifier rules: fsyncdir: ⊦ ;