Add tests for --json unused-externs
There were none at all. These test for original functionality, but this also adds a test that `-Dunused-crate-dependencies` causes a compilation failure, which currently fails (https://github.com/rust-lang/rust/issues/96068). This is fixed in subsequent changes.
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src/test/ui/unused-crate-deps/deny-attr.rs
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src/test/ui/unused-crate-deps/deny-attr.rs
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// Check for unused crate dep, no path
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// edition:2018
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// aux-crate:bar=bar.rs
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#![deny(unused_crate_dependencies)]
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//~^ ERROR external crate `bar` unused in
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fn main() {}
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src/test/ui/unused-crate-deps/deny-attr.stderr
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src/test/ui/unused-crate-deps/deny-attr.stderr
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error: external crate `bar` unused in `deny_attr`: remove the dependency or add `use bar as _;`
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--> $DIR/deny-attr.rs:6:1
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LL | #![deny(unused_crate_dependencies)]
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| ^
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note: the lint level is defined here
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--> $DIR/deny-attr.rs:6:9
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LL | #![deny(unused_crate_dependencies)]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to previous error
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src/test/ui/unused-crate-deps/deny-cmdline-json.rs
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src/test/ui/unused-crate-deps/deny-cmdline-json.rs
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// Check for unused crate dep, no path
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// edition:2018
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// compile-flags: -Dunused-crate-dependencies -Zunstable-options --json unused-externs --error-format=json
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// aux-crate:bar=bar.rs
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fn main() {}
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src/test/ui/unused-crate-deps/deny-cmdline-json.stderr
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src/test/ui/unused-crate-deps/deny-cmdline-json.stderr
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{"lint_level":"deny","unused_extern_names":["bar"]}
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src/test/ui/unused-crate-deps/deny-cmdline.rs
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src/test/ui/unused-crate-deps/deny-cmdline.rs
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// Check for unused crate dep, no path
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// edition:2018
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// compile-flags: -Dunused-crate-dependencies
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// aux-crate:bar=bar.rs
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fn main() {}
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//~^ ERROR external crate `bar` unused in
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src/test/ui/unused-crate-deps/deny-cmdline.stderr
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src/test/ui/unused-crate-deps/deny-cmdline.stderr
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error: external crate `bar` unused in `deny_cmdline`: remove the dependency or add `use bar as _;`
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--> $DIR/deny-cmdline.rs:7:1
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LL | fn main() {}
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| ^
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= note: requested on the command line with `-D unused-crate-dependencies`
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error: aborting due to previous error
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src/test/ui/unused-crate-deps/warn-cmdline-json.rs
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src/test/ui/unused-crate-deps/warn-cmdline-json.rs
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// Check for unused crate dep, no path
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// edition:2018
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// check-pass
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// compile-flags: -Wunused-crate-dependencies -Zunstable-options --json unused-externs --error-format=json
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// aux-crate:bar=bar.rs
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fn main() {}
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src/test/ui/unused-crate-deps/warn-cmdline-json.stderr
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src/test/ui/unused-crate-deps/warn-cmdline-json.stderr
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{"lint_level":"warn","unused_extern_names":["bar"]}
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