Sure, let's make Exception#getMessage `null` sometimes. Because inside a `catch` block seems like the perfect place to be accidentally throwing NPEs.
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Pervasive monomorphization means whenever you have a generic function/impl, you end up recompiling its body for every distinct type arguments, even if all you wanted was parametric polymorphism and not necessarily performance. That fundamentally limits incremental compilation.
That makes sense, even though I'm a little surprised it adds up to slower compile times than Scala's smorgasbord of features... but generic methods are very pervasive, so maybe I shouldn't be!
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Kind of comparing apples and oranges here, but for reference: the core rustc crate (99 files, 32k loc) apparently takes 315s to compile (http://gistpreview.github.io/?c8ff4e8a8e3be85d4e66c8505e3e8853 …); a clean `sbt compile` of the Dotty project (more than 500 files, close to 100k loc) took 44s on my mac.
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