54 lines
1.8 KiB
Markdown
54 lines
1.8 KiB
Markdown
# C# Language Design Notes for Nov 6, 2017
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***Warning: These are raw notes, and still need to be cleaned up. Read at your own peril!***
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# Roslyn 20870
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Protecting the client from unintended dependencies. But also protects from servicing. Today people going through reflection *know* they're being bad. Would this give enough sense that they are doing something special.
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It would make consumers lazy about contacting the API owner about things they need exposed.
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It would be an arms race - we would want the `IgnoreIgnore...` attribute to *really* protect things.
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People will still have expectations about dependencies even if it was "their own fault" by using this attribute.
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## Conclusion
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Too risky/fishy in too many ways.
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# Roslyn 17310
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There is no good language level solution right now. This is better addressed with an analyzer, which can know specifically about SpinLock (for instance).
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In time, when readonly struct declarations are added, as well as maybe the ability to declare individual struct members as readonly, *then* maybe we could start warn.
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## Conclusion
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Not at the language level
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# Roslyn 20450
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We have sympathy. It feels like a corner that's cut. But it's quite expensive to implement, and has semantic dark corners (`List<>.First.Foo`).
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## Conclusion
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Not now.
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# Roslyn 20015
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When default-expressions are constant (according to the language) this is not interesting expressiveness - there's a literal you can use.
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When they are *not* it gets a bit more interesting - you might want to check that your custom struct is zero-initialized. But you can do that with equality. Even in recursive scenarios, you can just `var`-pattern it and check in `when` or `&&`.
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Additionally there is some concern about the target type being clear enough for the `default` expression.
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## Conclusion
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No.
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