John McCall6:10 - I technically do say this right in the talk, but I feel a little guilty about how I'm conflating two slightly different points here. Typically, static dispatch is necessary in order to do interprocedural optimization (although it is possible to do speculative compile-time IPO). Static dispatch is not *sufficient*, though — if the compiler can't see the definition of the function it's calling, IPO is sill impossible.
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