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Rollup merge of #100674 - PragmaTwice:mig-typeck-unused-crate-diag, r=davidtwco
Migrate lint reports in typeck::check_unused to LintDiagnostic
In this PR, I migrate two lint reports in `typeck::check_unused` by `LintDiagnostic`, all of which is about extern crates.
```@rustbot``` label +A-translation
r? rust-lang/diagnostics
