foo {} is a CALL to a function named foo, passing a hashref - not a function declaration. You need a semi-colon after a function call. update: well, most of the time - not at the end of a file or block, for example, but you do need one before starting a new package.

You probably meant something like:

package foo;
sub foo {}

package foo::bar;
sub bar {}
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Note the subs.