did you separate the arguments behind the block with a comma after introducing "sub"?
DB<25> sub run (&@) { my $code =shift; $code->(@_) }
DB<26> *mce_loop = \&run
DB<27> mce_loop {print "code @_"} 1,2,3 # no comma needed
code 1 2 3
DB<28> mce_loop sub {print "code @_"}, 1,2,3 # comma needed
code 1 2 3
DB<29> mce_loop sub {print "code @_"} 1,2,3 # syntax error
Number found where operator expected at (eval 38) ...
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