I forgot the bit about how appending require URI; changes the result. I struck out my earlier statement. As you can see, require URI; does have a compile-time effect on the symbol table: 
>perl -le"print for grep /::$/, keys %::"
...
Internals::
DB::

>perl -le"print for grep /::$/, keys %::; require URI;"
...
Internals::
DB::
URI::

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In reply to Re^4: require at compile time? by ikegami
in thread require at compile time? by jbazik

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