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flush
Combined from primary sources listed below.

In IO::Handle§

See primary documentation in context for method flush 

method flush(IO::Handle:D: --> True)

Will flush the handle, writing any of the buffered data. Returns True on success; otherwise, fails with X::IO::Flush.

given "foo".IO.open: :w {
    LEAVE .close;
    .print: 'something';
    'foo'.IO.slurp.say; # (if the data got buffered) OUTPUT: «␤»
    .flush;             # flush the handle
    'foo'.IO.slurp.say; # OUTPUT: «something␤»
}