DB<8> sub run (&@) {}

  DB<9> *mce_loop = \&run

  DB<10> mce_loop {print "code"}

  DB<11> mce_loop sub {print "code"}

  DB<12> mce_loop sub {print "code"},@_

  DB<13> mce_loop 1
Type of arg 1 to main::run must be block or sub {} (not constant item) at