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#autoload
# Utility function to call a function if it exists.
#
# Usage: _funcall <return> <name> [ <args> ... ]
#
# If a function named <name> is defined (or defined to be autoloaded),
# it is called. If <return> is given not the string `-' or empty, it is
# taken as the name of a parameter and the return status of the function
# called is stored in this parameter. All other arguments are given
# to the function called.
# The return value of this function is zero if the function was
# called and non-zero otherwise.
local _name _ret
[[ "$1" != (|-) ]] && _name="$1"
shift
if (( $+functions[$1] )); then
"$@"
_ret="$?"
[[ -n "$_name" ]] && eval "${_name}=${_ret}"
compstate[restore]=''
return 0
fi
return 1
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