Gnuplot complain with ')' expected when array is not defined at specific line

If I use this script Gnuplot complains with error : ')' expected


### strange behaviour with setting arrays and using stats reset session $Data <<EOD 1 10 2 20 3 30 4 40 EOD stats $Data u (c=$0+1) nooutput # get the number of rows into c array M[c] array M_x_N[c] stats $Data u (M[int($0+1)] = $1) name "M" nooutput stats $Data u (M_x_N[int($0+1)] = $2) name "M_x_N" nooutput ### end of script

However, if you change the sequence to the following, it will work. 

array M[c]  stats $Data u (M[int($0+1)] = $1) name "M" nooutput


array M_x_N[c] stats $Data u (M_x_N[int($0+1)] = $2) name "M_x_N" nooutput


Is this a bug?

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