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$ perl -e'Socket->VERSION(1.3)'
Socket defines neither package nor VERSION--version check failed at -e
+ line 1.

$ perl -e'BEGIN { $INC{"Socket.pm"}=1; } use Socket 1.3'
Socket defines neither package nor VERSION--version check failed at -e
+ line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl -e'BEGIN { 1 for $INC{"Socket.pm"}; } use Socket 1.3'
Socket defines neither package nor VERSION--version check failed at -e
+ line 1.
BEGIN failed--compilation aborted at -e line 1.

BEGIN {
    if (exists($INC{"Socket.pm"}) {
...
        warn(">>> absent\n");
    }
}