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  1. or download this
    >perl -we"sub trim(@); sub trim($) {}"
Prototype mismatch: sub main::trim (@) vs ($) at -e line 1.
  2. or download this
    >perl -we"trim('abc'); sub trim($) {}"
main::trim() called too early to check prototype at -e line 1.
  3. or download this
    >perl -we"sub trim {} sub trim($) {}"
Prototype mismatch: sub main::trim: none vs ($) at -e line 1.
Subroutine trim redefined at -e line 1.