Esteban Küber d82fb1e72d Emit a single error when importing a path with _ ...

When encountering `use _;`, `use _::*'` or similar, do not emit two errors for that single mistake. This also side-steps the issue of resolve errors suggesting adding a crate named `_` to `Cargo.toml`.

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auxiliary

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basic.rs

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basic.stderr

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cycle.rs

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duplicate.rs

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hygiene-2.rs

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hygiene.rs

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intercrate.rs

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issue-110164.ed2015.stderr

Emit a single error when importing a path with _

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issue-110164.ed2021.stderr

Emit a single error when importing a path with _

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issue-110164.rs

Emit a single error when importing a path with _

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macro-expanded.rs

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multiple-uses.ed2015.stderr

Emit a single error when importing a path with _

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multiple-uses.ed2021.stderr

Emit a single error when importing a path with _

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multiple-uses.rs

Emit a single error when importing a path with _

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shadow.rs

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shadow.stderr

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unused-2018.rs

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unused-2018.stderr

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