@edwinbrady does this mean type-level functions are never really "evaluated" at all?pic.twitter.com/kXtF6S69os
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It gets evaluated when checking each pattern, where its form is known. Try putting holes on the RHS and look at their types.
okay so the format string must be a string literal or otherwise fully defined at compile time?
Typically, yes. Or, at least, somehow consistent with the rest of the arguments
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