>perl -le
"my @mra = ( [ qw(a b eye c) ],  [ qw{w x y z} ], );
 ;;
 print qq{'$mra[1][2]'};
 print qq{'$mra[i][2]'};
"
'y'
'eye'

>perl -le
"use warnings;
 ;;
 my @mra = ( [ qw(a b eye c) ],  [ qw{w x y z} ], );
 ;;
 print qq{'$mra[1][2]'};
 print qq{'$mra[i][2]'};
"
Unquoted string "i" may clash with future reserved word at -e line 1.
'y'
Argument "i" isn't numeric in array element at -e line 1.
'eye'

>perl -le
"use warnings;
 use strict;
 ;;
 my @mra = ( [ qw(a b eye c) ],  [ qw{w x y z} ], );
 ;;
 print qq{'$mra[1][2]'};
 print qq{'$mra[i][2]'};
"
Bareword "i" not allowed while "strict subs" in use at -e line 1.
Execution of -e aborted due to compilation errors.