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  DB<128>   $CORE::{substr}
 => *CORE::substr

  DB<129>   $CORE::{print}
 => undef

prototype FUNCTION
               Returns the prototype of a function as a string (or "un
+def" if
...
               prototype() returns "undef", because the builtin does n
+ot
               really behave like a Perl function.  Otherwise, the str
+ing
               describing the equivalent prototype is returned.

  DB<131> prototype 'CORE::print'
 => undef

  DB<132> prototype 'CORE::substr'
 => "\$\$;\$\$"

  DB<133> CORE::print("bla")
bla