Re^2: What is the scope of BEGIN? Or... when does it "begin?"

[Mutant]

See tlm's reply above. use is impicitly wrapped in a BEGIN. And since BEGIN's have no precedence over each other, your second example is effectively:

BEGIN {
  require mylib1;
  mylib1->import();
  unshift (@INC,"\\mylib");
}

(I left out 'use strict' for simplicity's sake).