Increased severity of lints in 2021 edition

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If there is a 2021 edition, what lints should have increased severity, if any?

Looking through the list of lints, a few are already listed as deprecated/being phased out but are allow by default:

Similarly, currently warn by default and deprecated/being phased out:

I think this is a good starting point, but there are definitely others (like const-err) that make perfect sense to increase the severity of.

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I would be happy already if at least rustdoc would follow this. (See for example the return type of

Mutex::lock.)

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Wait, what? The docs you linked to say:

So now lifetime elision is being deprecated? Why?

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You can still elide obvious cases with direct references, but it's the hidden cases that are deprecated. If you have a struct Foo<'a>, then in use it should at least be written Foo<'_>, if not with an explicit lifetime.

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Ah, okay. The documentation is kinda short-spoken on that.

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A better name for the lint would probably be omitted lifetime, not elided.

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