Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

False positives for dev-dependencies with unused_crate_dependencies lint #72686

Closed
svartalf opened this issue May 28, 2020 · 5 comments · Fixed by #72702
Closed

False positives for dev-dependencies with unused_crate_dependencies lint #72686

svartalf opened this issue May 28, 2020 · 5 comments · Fixed by #72702
Labels
A-lint Area: Lints (warnings about flaws in source code) such as unused_mut. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

Comments

@svartalf
Copy link

unused_crate_dependencies lint introduced in #72342 causes false positives for [dev-dependencies].

To reproduce:

$ cargo new --lib unused
     Created library `unused` package

$ cd unused

$ echo '#![deny(unused)]' > src/lib.rs

$ echo '[dev-dependencies]
version-sync = "0.9"' >> Cargo.toml

$ mkdir tests

$ echo '#[test]
fn test_html_root_url() {
    version_sync::assert_html_root_url_updated!("src/lib.rs");
}' > tests/version.rs

I expected to execute cargo +nightly test correctly.

Instead, this happened:

$ cargo +nightly test
   Compiling unused v0.1.0 (/tmp/unused)
error: external crate `version_sync` unused in `unused`: remove the dependency or add `use version_sync as _;`
  |
note: the lint level is defined here
 --> src/lib.rs:1:9
  |
1 | #![deny(unused)]
  |         ^^^^^^
  = note: `#[deny(unused_crate_dependencies)]` implied by `#[deny(unused)]`

error: aborting due to previous error

error: could not compile `unused`.

To learn more, run the command again with --verbose.

I expect dev-dependencies to be ignored by this lint, because they are in fact used in tests/ modules.
"remove the dependency or add use version_sync as _;" help message is also unhelpful, because it will cause unresolved imports for cargo build and similar commands.

Meta

rustc --version --verbose:

rustup run nightly rustc --version --verbose
rustc 1.45.0-nightly (664fcd3f0 2020-05-27)
binary: rustc
commit-hash: 664fcd3f046e2a6824602da0fad81e3e2bb0d409
commit-date: 2020-05-27
host: x86_64-unknown-linux-gnu
release: 1.45.0-nightly
LLVM version: 10.0
Full verbose build log 

$ cargo +nightly test --verbose
   Compiling memchr v2.3.3
   Compiling version_check v0.9.2
   Compiling proc-macro2 v1.0.17
   Compiling unicode-xid v0.2.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name build_script_build /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/memchr-2.3.3/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' --cfg 'feature="use_std"' -C metadata=c7f795a0c7e9979b -C extra-filename=-c7f795a0c7e9979b --out-dir /tmp/unused/target/debug/build/memchr-c7f795a0c7e9979b -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name version_check /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/version_check-0.9.2/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=82cc027e9ceba674 -C extra-filename=-82cc027e9ceba674 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name build_script_build --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/proc-macro2-1.0.17/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="proc-macro"' --cfg 'feature="span-locations"' -C metadata=e23547cdc7db7e81 -C extra-filename=-e23547cdc7db7e81 --out-dir /tmp/unused/target/debug/build/proc-macro2-e23547cdc7db7e81 -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name unicode_xid /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/unicode-xid-0.2.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=78174849e41719c0 -C extra-filename=-78174849e41719c0 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling serde v1.0.110
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name build_script_build /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/serde-1.0.110/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=0cc309bc7ba935eb -C extra-filename=-0cc309bc7ba935eb --out-dir /tmp/unused/target/debug/build/serde-0cc309bc7ba935eb -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling smallvec v1.4.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name smallvec --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/smallvec-1.4.0/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=84f514d64495f7fb -C extra-filename=-84f514d64495f7fb --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling bitflags v1.2.1
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name build_script_build /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bitflags-1.2.1/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=6de1ffcc56ec72ff -C extra-filename=-6de1ffcc56ec72ff --out-dir /tmp/unused/target/debug/build/bitflags-6de1ffcc56ec72ff -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling matches v0.1.8
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name matches /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/matches-0.1.8/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=346dc0eba02e242b -C extra-filename=-346dc0eba02e242b --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling lazy_static v1.4.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name lazy_static /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/lazy_static-1.4.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=5fa5bc44b10bdd8d -C extra-filename=-5fa5bc44b10bdd8d --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling syn v1.0.27
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name build_script_build --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/syn-1.0.27/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' -C metadata=71a7901023ddb067 -C extra-filename=-71a7901023ddb067 --out-dir /tmp/unused/target/debug/build/syn-71a7901023ddb067 -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling pulldown-cmark v0.7.1
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name build_script_build --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/pulldown-cmark-0.7.1/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=205bcfdd39cbd395 -C extra-filename=-205bcfdd39cbd395 --out-dir /tmp/unused/target/debug/build/pulldown-cmark-205bcfdd39cbd395 -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling either v1.5.3
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name either /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/either-1.5.3/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=498735f8abeeff51 -C extra-filename=-498735f8abeeff51 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling regex-syntax v0.6.17
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name regex_syntax /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/regex-syntax-0.6.17/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="unicode"' --cfg 'feature="unicode-age"' --cfg 'feature="unicode-bool"' --cfg 'feature="unicode-case"' --cfg 'feature="unicode-gencat"' --cfg 'feature="unicode-perl"' --cfg 'feature="unicode-script"' --cfg 'feature="unicode-segment"' -C metadata=eecb392efa84ae60 -C extra-filename=-eecb392efa84ae60 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling percent-encoding v2.1.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name percent_encoding /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/percent-encoding-2.1.0/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=be58b329e394d460 -C extra-filename=-be58b329e394d460 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling semver-parser v0.9.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name semver_parser /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/semver-parser-0.9.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=9ae31022f24ccd12 -C extra-filename=-9ae31022f24ccd12 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow`
   Compiling unused v0.1.0 (/tmp/unused)
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name unused --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=d0a289a20cd6d031 -C extra-filename=-d0a289a20cd6d031 --out-dir /tmp/unused/target/debug/deps -C incremental=/tmp/unused/target/debug/incremental -L dependency=/tmp/unused/target/debug/deps`
   Compiling unicase v2.6.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name build_script_build /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/unicase-2.6.0/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=b7d2e523ca3e437f -C extra-filename=-b7d2e523ca3e437f --out-dir /tmp/unused/target/debug/build/unicase-b7d2e523ca3e437f -L dependency=/tmp/unused/target/debug/deps --extern version_check=/tmp/unused/target/debug/deps/libversion_check-82cc027e9ceba674.rlib --cap-lints allow`
   Compiling unicode-normalization v0.1.12
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name unicode_normalization /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/unicode-normalization-0.1.12/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=15192e5eeeaa0455 -C extra-filename=-15192e5eeeaa0455 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern smallvec=/tmp/unused/target/debug/deps/libsmallvec-84f514d64495f7fb.rmeta --cap-lints allow`
     Running `/tmp/unused/target/debug/build/memchr-c7f795a0c7e9979b/build-script-build`
   Compiling unicode-bidi v0.3.4
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name unicode_bidi /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/unicode-bidi-0.3.4/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=6e8dc3321fee5867 -C extra-filename=-6e8dc3321fee5867 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern matches=/tmp/unused/target/debug/deps/libmatches-346dc0eba02e242b.rmeta --cap-lints allow`
   Compiling thread_local v1.0.1
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name thread_local /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/thread_local-1.0.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=57a3b23f69080e57 -C extra-filename=-57a3b23f69080e57 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern lazy_static=/tmp/unused/target/debug/deps/liblazy_static-5fa5bc44b10bdd8d.rmeta --cap-lints allow`
     Running `/tmp/unused/target/debug/build/serde-0cc309bc7ba935eb/build-script-build`
     Running `/tmp/unused/target/debug/build/proc-macro2-e23547cdc7db7e81/build-script-build`
     Running `/tmp/unused/target/debug/build/bitflags-6de1ffcc56ec72ff/build-script-build`
   Compiling itertools v0.9.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name itertools --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/itertools-0.9.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="use_std"' -C metadata=592e37ac98e9c955 -C extra-filename=-592e37ac98e9c955 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern either=/tmp/unused/target/debug/deps/libeither-498735f8abeeff51.rmeta --cap-lints allow`
     Running `/tmp/unused/target/debug/build/pulldown-cmark-205bcfdd39cbd395/build-script-build`
     Running `/tmp/unused/target/debug/build/syn-71a7901023ddb067/build-script-build`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name memchr /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/memchr-2.3.3/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' --cfg 'feature="use_std"' -C metadata=7db8e3be84bf03b4 -C extra-filename=-7db8e3be84bf03b4 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow --cfg memchr_runtime_simd --cfg memchr_runtime_sse2 --cfg memchr_runtime_sse42 --cfg memchr_runtime_avx`
     Running `/tmp/unused/target/debug/build/unicase-b7d2e523ca3e437f/build-script-build`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name serde /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/serde-1.0.110/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=8c9be886b59d121a -C extra-filename=-8c9be886b59d121a --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow --cfg ops_bound --cfg core_reverse --cfg de_boxed_c_str --cfg de_boxed_path --cfg de_rc_dst --cfg core_duration --cfg integer128 --cfg range_inclusive --cfg num_nonzero --cfg core_try_from --cfg num_nonzero_signed --cfg std_atomic64 --cfg std_atomic`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name proc_macro2 --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/proc-macro2-1.0.17/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="proc-macro"' --cfg 'feature="span-locations"' -C metadata=ee5ee5acdcf42a09 -C extra-filename=-ee5ee5acdcf42a09 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern unicode_xid=/tmp/unused/target/debug/deps/libunicode_xid-78174849e41719c0.rmeta --cap-lints allow --cfg span_locations --cfg hygiene --cfg use_proc_macro --cfg wrap_proc_macro --cfg proc_macro_span`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name bitflags /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bitflags-1.2.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=495057c2a47c9bc0 -C extra-filename=-495057c2a47c9bc0 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow --cfg bitflags_const_fn`
   Compiling idna v0.2.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name idna /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/idna-0.2.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=68eec88b56a5c01c -C extra-filename=-68eec88b56a5c01c --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern matches=/tmp/unused/target/debug/deps/libmatches-346dc0eba02e242b.rmeta --extern unicode_bidi=/tmp/unused/target/debug/deps/libunicode_bidi-6e8dc3321fee5867.rmeta --extern unicode_normalization=/tmp/unused/target/debug/deps/libunicode_normalization-15192e5eeeaa0455.rmeta --cap-lints allow`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name unicase /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/unicase-2.6.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=2f1457e7ede0320d -C extra-filename=-2f1457e7ede0320d --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --cap-lints allow --cfg __unicase__iter_cmp --cfg __unicase__default_hasher --cfg __unicase__const_fns --cfg __unicase__core_and_alloc`
   Compiling aho-corasick v0.7.10
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name aho_corasick /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/aho-corasick-0.7.10/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=15de38d034070f8e -C extra-filename=-15de38d034070f8e --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern memchr=/tmp/unused/target/debug/deps/libmemchr-7db8e3be84bf03b4.rmeta --cap-lints allow`
   Compiling quote v1.0.6
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name quote --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/quote-1.0.6/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="proc-macro"' -C metadata=2a477e1967d634e4 -C extra-filename=-2a477e1967d634e4 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern proc_macro2=/tmp/unused/target/debug/deps/libproc_macro2-ee5ee5acdcf42a09.rmeta --cap-lints allow`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name pulldown_cmark --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/pulldown-cmark-0.7.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=fc38f16cf4b0e353 -C extra-filename=-fc38f16cf4b0e353 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern bitflags=/tmp/unused/target/debug/deps/libbitflags-495057c2a47c9bc0.rmeta --extern memchr=/tmp/unused/target/debug/deps/libmemchr-7db8e3be84bf03b4.rmeta --extern unicase=/tmp/unused/target/debug/deps/libunicase-2f1457e7ede0320d.rmeta --cap-lints allow`
   Compiling url v2.1.1
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name url /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/url-2.1.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=3d67c767c538e9bc -C extra-filename=-3d67c767c538e9bc --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern idna=/tmp/unused/target/debug/deps/libidna-68eec88b56a5c01c.rmeta --extern matches=/tmp/unused/target/debug/deps/libmatches-346dc0eba02e242b.rmeta --extern percent_encoding=/tmp/unused/target/debug/deps/libpercent_encoding-be58b329e394d460.rmeta --cap-lints allow`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name syn --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/syn-1.0.27/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' -C metadata=cb4b3804c6eed20c -C extra-filename=-cb4b3804c6eed20c --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern proc_macro2=/tmp/unused/target/debug/deps/libproc_macro2-ee5ee5acdcf42a09.rmeta --extern quote=/tmp/unused/target/debug/deps/libquote-2a477e1967d634e4.rmeta --extern unicode_xid=/tmp/unused/target/debug/deps/libunicode_xid-78174849e41719c0.rmeta --cap-lints allow`
   Compiling regex v1.3.7
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name regex /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/regex-1.3.7/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="aho-corasick"' --cfg 'feature="default"' --cfg 'feature="memchr"' --cfg 'feature="perf"' --cfg 'feature="perf-cache"' --cfg 'feature="perf-dfa"' --cfg 'feature="perf-inline"' --cfg 'feature="perf-literal"' --cfg 'feature="std"' --cfg 'feature="thread_local"' --cfg 'feature="unicode"' --cfg 'feature="unicode-age"' --cfg 'feature="unicode-bool"' --cfg 'feature="unicode-case"' --cfg 'feature="unicode-gencat"' --cfg 'feature="unicode-perl"' --cfg 'feature="unicode-script"' --cfg 'feature="unicode-segment"' -C metadata=939ed0e7d48e5780 -C extra-filename=-939ed0e7d48e5780 --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern aho_corasick=/tmp/unused/target/debug/deps/libaho_corasick-15de38d034070f8e.rmeta --extern memchr=/tmp/unused/target/debug/deps/libmemchr-7db8e3be84bf03b4.rmeta --extern regex_syntax=/tmp/unused/target/debug/deps/libregex_syntax-eecb392efa84ae60.rmeta --extern thread_local=/tmp/unused/target/debug/deps/libthread_local-57a3b23f69080e57.rmeta --cap-lints allow`
   Compiling toml v0.5.6
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name toml --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/toml-0.5.6/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=9f5059a41c453e1f -C extra-filename=-9f5059a41c453e1f --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern serde=/tmp/unused/target/debug/deps/libserde-8c9be886b59d121a.rmeta --cap-lints allow`
   Compiling version-sync v0.9.0
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name version_sync --edition=2018 /home/svartalf/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/version-sync-0.9.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=63010f3e92cb9d7d -C extra-filename=-63010f3e92cb9d7d --out-dir /tmp/unused/target/debug/deps -L dependency=/tmp/unused/target/debug/deps --extern itertools=/tmp/unused/target/debug/deps/libitertools-592e37ac98e9c955.rmeta --extern proc_macro2=/tmp/unused/target/debug/deps/libproc_macro2-ee5ee5acdcf42a09.rmeta --extern pulldown_cmark=/tmp/unused/target/debug/deps/libpulldown_cmark-fc38f16cf4b0e353.rmeta --extern regex=/tmp/unused/target/debug/deps/libregex-939ed0e7d48e5780.rmeta --extern semver_parser=/tmp/unused/target/debug/deps/libsemver_parser-9ae31022f24ccd12.rmeta --extern syn=/tmp/unused/target/debug/deps/libsyn-cb4b3804c6eed20c.rmeta --extern toml=/tmp/unused/target/debug/deps/libtoml-9f5059a41c453e1f.rmeta --extern url=/tmp/unused/target/debug/deps/liburl-3d67c767c538e9bc.rmeta --cap-lints allow`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name unused --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 --test -C metadata=75b39d4b3fec8f49 -C extra-filename=-75b39d4b3fec8f49 --out-dir /tmp/unused/target/debug/deps -C incremental=/tmp/unused/target/debug/incremental -L dependency=/tmp/unused/target/debug/deps --extern version_sync=/tmp/unused/target/debug/deps/libversion_sync-63010f3e92cb9d7d.rlib`
     Running `/home/svartalf/.cargo/bin/sccache rustc --crate-name version --edition=2018 tests/version.rs --error-format=json --json=diagnostic-rendered-ansi --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 --test -C metadata=89ad4aa3484f45c0 -C extra-filename=-89ad4aa3484f45c0 --out-dir /tmp/unused/target/debug/deps -C incremental=/tmp/unused/target/debug/incremental -L dependency=/tmp/unused/target/debug/deps --extern unused=/tmp/unused/target/debug/deps/libunused-d0a289a20cd6d031.rlib --extern version_sync=/tmp/unused/target/debug/deps/libversion_sync-63010f3e92cb9d7d.rlib`
error: external crate `version_sync` unused in `unused`: remove the dependency or add `use version_sync as _;`
  |
note: the lint level is defined here
 --> src/lib.rs:1:9
  |
1 | #![deny(unused)]
  |         ^^^^^^
  = note: `#[deny(unused_crate_dependencies)]` implied by `#[deny(unused)]`

error: aborting due to previous error

error: could not compile `unused`.

Caused by:
  process didn't exit successfully: `/home/svartalf/.cargo/bin/sccache rustc --crate-name unused --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --emit=dep-info,link -Cembed-bitcode=no -C debuginfo=2 --test -C metadata=75b39d4b3fec8f49 -C extra-filename=-75b39d4b3fec8f49 --out-dir /tmp/unused/target/debug/deps -C incremental=/tmp/unused/target/debug/incremental -L dependency=/tmp/unused/target/debug/deps --extern version_sync=/tmp/unused/target/debug/deps/libversion_sync-63010f3e92cb9d7d.rlib` (exit code: 1)
warning: build failed, waiting for other jobs to finish...
error: build failed

@svartalf svartalf added the C-bug Category: This is a bug. label May 28, 2020
@petrochenkov
Copy link
Contributor

cc @jsgf
unused_crate_dependencies needs to be removed from the unused lint group, I didn't notice this when reviewing #72342.
Otherwise it can be enabled in a blanket way without enabling unused_crate_dependencies specifically, which is undesirable given the amount of redundant options passed by Cargo.

@jonas-schievink jonas-schievink added A-lint Area: Lints (warnings about flaws in source code) such as unused_mut. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 28, 2020
svartalf added a commit to heim-rs/heim that referenced this issue May 28, 2020
@svartalf
Fix CI tests failures caused by rust-lang/rust#72686
4f5a143
@petrochenkov petrochenkov mentioned this issue May 28, 2020
Merged
@petrochenkov
Copy link
Contributor

Fixed in #72702.

@jsgf
Copy link
Contributor

jsgf commented May 28, 2020

Yeah this is the reason it's not on by default. We still need to work out if/how it can be used with cargo in a reasonable way.

Adding it to unused made sense to me but I didn't think through the fallout.

svartalf added a commit to heim-rs/heim that referenced this issue May 28, 2020
@svartalf
Fix CI tests failures caused by rust-lang/rust#72686
94c0f78
@jsgf
Copy link
Contributor

jsgf commented May 28, 2020 •
edited
Loading

@svartalf Though TBH I'm a bit confused - what targets is Cargo passing dev-dependencies to aside from tests? I would have thought your case would be OK.

Hm, I think there may be another bug that -Wunused-crate-dependencies isn't seeing uses in #[test] blocks. At the very least it needs a test for that.

@bors bors closed this as completed in 049b6dd May 29, 2020
@prybalko prybalko mentioned this issue Aug 16, 2022
Merged
@phated phated mentioned this issue Apr 10, 2023
Merged
6 tasks
@tv42
Copy link
Contributor

tv42 commented Sep 8, 2023 •
edited
Loading

As far as I can tell, this issue wasn't fixed, unused_crate_dependencies was just removed from the unused group.

The functionality of unused_crate_dependencies is still desirable!

See #57274

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
A-lint Area: Lints (warnings about flaws in source code) such as unused_mut. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
Projects
None yet
Milestone
No milestone
Development

Successfully merging a pull request may close this issue.

rustc_lint: Remove unused_crate_dependencies from the unused group petrochenkov/rust
5 participants
@jsgf @tv42 @svartalf @jonas-schievink @petrochenkov