[Help-bash] coprocess help

[lxnf98mm]

I am playing with coproc.bash that comes with version 3.2.25
Having no luck

$ coprocess open "/usr/bin/bc -l"
[1] 13460
$ /usr/share/doc/bash-3.2/functions/coproc.bash: line 53: /usr/bin/bc -l: No 
such file or directory
[1]+  Done                    ( "$@" < $fifo.in > $fifo.out; rm -f "$fifo.in" 
"$fifo.out" )

I know this is a old version of bash but it is what I am stuck with

Thanks
Richard