This is more than likely the best way to read an entire file into a given variable $code all in one go:
my $code = do { local $/; <$fh> };
Notice that by localizing the input record separator $/ variable within the brackets, unwanted side-effects are avoided.
Of course, if one is more prone to power slurping, then the module Perl6::Slurp offers a much more advanced interface, but one will just have to be patient and wait awhile.
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