lean4-htt/tests/lean/warningAsError.lean

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set_option linter.deprecated true
def f (x : Nat) := x + 1
@[deprecated f]
def g (x : Nat) := x + 1
#eval g 0 -- warning
set_option warningAsError true
#eval g 0 -- error
set_option linter.unusedVariables true
def h (unused : Nat) := 0 -- error