$| = 1; affects the currently selected handle. This is the handle print, printf and say use if you don't provide one., and it defaults to STDOUT.

In fact, ->autoflush changes the currently selected handle to the invocant, sets $|, then restores the originally selected handle.

In reply to Re^3: The print is output later after die by ikegami
in thread The print is output later after die by Anonymous Monk

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