def warn.err
import ezx@1.11.0.0/src/share/cap.bend as Capimport Base
84# the same warning on stderr, for a command whose stdout is the program's
85def warn.err(on: Bool) -> IO(Unit):
86 match on:
87 case True{}:
88 IO.pure(Unit, Unit{})
89 case False{}:
90 IO.print_err(warning())