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ready
Combined from primary sources listed below.

In Proc::Async§

See primary documentation in context for method ready 

method ready(Proc::Async:D: --> Promise:D)

Returns a Promise that will be kept once the process has successfully started. Promise will be broken if the program fails to start.

Implementation-specific note: Starting from Rakudo 2018.04, the returned promise will hold the process id (PID).