[INFO] fetching crate subtle-ng-derive 0.0.5...
[INFO] testing subtle-ng-derive-0.0.5 against try#33835004928d3bf65db4d4712e1330766263b0bd for pr-155739-1
[INFO] extracting crate subtle-ng-derive 0.0.5 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate subtle-ng-derive 0.0.5
[INFO] finished tweaking crates.io crate subtle-ng-derive 0.0.5
[INFO] tweaked toml for crates.io crate subtle-ng-derive 0.0.5 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate subtle-ng-derive 0.0.5 on toolchain 33835004928d3bf65db4d4712e1330766263b0bd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[INFO] [stderr]       Adding syn v1.0.109 (available: v2.0.117)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d6fa1c0de8125450813298ccbae00e9bf94127a40f1e289821774ab7eb5c9f18
[INFO] running `Command { std: "docker" "start" "-a" "d6fa1c0de8125450813298ccbae00e9bf94127a40f1e289821774ab7eb5c9f18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d6fa1c0de8125450813298ccbae00e9bf94127a40f1e289821774ab7eb5c9f18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d6fa1c0de8125450813298ccbae00e9bf94127a40f1e289821774ab7eb5c9f18", kill_on_drop: false }`
[INFO] [stdout] d6fa1c0de8125450813298ccbae00e9bf94127a40f1e289821774ab7eb5c9f18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 873bc4bc869741dfdca9f0a2622d9c097d5d99384d6bc8a4fd5410c9e4ec5893
[INFO] running `Command { std: "docker" "start" "-a" "873bc4bc869741dfdca9f0a2622d9c097d5d99384d6bc8a4fd5410c9e4ec5893", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling subtle-ng-derive v0.0.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `params`
[INFO] [stdout]   --> src/lib.rs:68:7
[INFO] [stdout]    |
[INFO] [stdout] 68 |       params,
[INFO] [stdout]    |       ^^^^^^ help: try ignoring the field: `params: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `where_clause`
[INFO] [stdout]   --> src/lib.rs:69:7
[INFO] [stdout]    |
[INFO] [stdout] 69 |       where_clause,
[INFO] [stdout]    |       ^^^^^^^^^^^^ help: try ignoring the field: `where_clause: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.66s
[INFO] running `Command { std: "docker" "inspect" "873bc4bc869741dfdca9f0a2622d9c097d5d99384d6bc8a4fd5410c9e4ec5893", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "873bc4bc869741dfdca9f0a2622d9c097d5d99384d6bc8a4fd5410c9e4ec5893", kill_on_drop: false }`
[INFO] [stdout] 873bc4bc869741dfdca9f0a2622d9c097d5d99384d6bc8a4fd5410c9e4ec5893
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a98ed114d924ad79289b0bdf88e8955fbfb28722252ed2aab9aca4c23bc4fba
[INFO] running `Command { std: "docker" "start" "-a" "8a98ed114d924ad79289b0bdf88e8955fbfb28722252ed2aab9aca4c23bc4fba", kill_on_drop: false }`
[INFO] [stderr]    Compiling subtle-ng-derive v0.0.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `params`
[INFO] [stdout]   --> src/lib.rs:68:7
[INFO] [stdout]    |
[INFO] [stdout] 68 |       params,
[INFO] [stdout]    |       ^^^^^^ help: try ignoring the field: `params: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `where_clause`
[INFO] [stdout]   --> src/lib.rs:69:7
[INFO] [stdout]    |
[INFO] [stdout] 69 |       where_clause,
[INFO] [stdout]    |       ^^^^^^^^^^^^ help: try ignoring the field: `where_clause: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `params`
[INFO] [stdout]   --> src/lib.rs:68:7
[INFO] [stdout]    |
[INFO] [stdout] 68 |       params,
[INFO] [stdout]    |       ^^^^^^ help: try ignoring the field: `params: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `where_clause`
[INFO] [stdout]   --> src/lib.rs:69:7
[INFO] [stdout]    |
[INFO] [stdout] 69 |       where_clause,
[INFO] [stdout]    |       ^^^^^^^^^^^^ help: try ignoring the field: `where_clause: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.85s
[INFO] running `Command { std: "docker" "inspect" "8a98ed114d924ad79289b0bdf88e8955fbfb28722252ed2aab9aca4c23bc4fba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a98ed114d924ad79289b0bdf88e8955fbfb28722252ed2aab9aca4c23bc4fba", kill_on_drop: false }`
[INFO] [stdout] 8a98ed114d924ad79289b0bdf88e8955fbfb28722252ed2aab9aca4c23bc4fba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] cc5b59ab72a5d709f8b33a9fd6bf89dcd2bd2b89ae99b4f43f932f594cb616d7
[INFO] running `Command { std: "docker" "start" "-a" "cc5b59ab72a5d709f8b33a9fd6bf89dcd2bd2b89ae99b4f43f932f594cb616d7", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `params`
[INFO] [stderr]   --> src/lib.rs:68:7
[INFO] [stderr]    |
[INFO] [stderr] 68 |       params,
[INFO] [stderr]    |       ^^^^^^ help: try ignoring the field: `params: _`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `where_clause`
[INFO] [stderr]   --> src/lib.rs:69:7
[INFO] [stderr]    |
[INFO] [stderr] 69 |       where_clause,
[INFO] [stderr]    |       ^^^^^^^^^^^^ help: try ignoring the field: `where_clause: _`
[INFO] [stderr] 
[INFO] [stderr] warning: `subtle-ng-derive` (lib) generated 2 warnings (run `cargo fix --lib -p subtle-ng-derive` to apply 2 suggestions)
[INFO] [stderr] warning: `subtle-ng-derive` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/subtle_ng_derive-dad099be9b461fd8)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests subtle_ng_derive
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - derive_gt (line 163) ... FAILED
[INFO] [stdout] test src/lib.rs - derive_eq_impls (line 121) ... FAILED
[INFO] [stdout] test src/lib.rs - derive_ord_impls (line 249) ... FAILED
[INFO] [stdout] test src/lib.rs - derive_eq (line 42) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - derive_gt (line 163) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `subtle`
[INFO] [stdout]    --> src/lib.rs:165:5
[INFO] [stdout]     |
[INFO] [stdout] 165 | use subtle::ConstantTimeGreater;
[INFO] [stdout]     |     ^^^^^^ use of unresolved module or unlinked crate `subtle`
[INFO] [stdout]     |
[INFO] [stdout]     = help: if you wanted to use a crate named `subtle`, use `cargo add subtle` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `subtle`
[INFO] [stdout]    --> src/lib.rs:168:11
[INFO] [stdout]     |
[INFO] [stdout] 168 |  #[derive(ConstantTimeGreater)]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstantTimeGreater` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `subtle`
[INFO] [stdout]    --> src/lib.rs:175:11
[INFO] [stdout]     |
[INFO] [stdout] 175 |  #[derive(ConstantTimeGreater)]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstantTimeGreater` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `subtle` in the crate root
[INFO] [stdout]    --> src/lib.rs:168:11
[INFO] [stdout]     |
[INFO] [stdout] 168 |  #[derive(ConstantTimeGreater)]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstantTimeGreater` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `subtle` in the crate root
[INFO] [stdout]    --> src/lib.rs:175:11
[INFO] [stdout]     |
[INFO] [stdout] 175 |  #[derive(ConstantTimeGreater)]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstantTimeGreater` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - derive_eq_impls (line 121) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `subtle`
[INFO] [stdout]    --> src/lib.rs:125:34
[INFO] [stdout]     |
[INFO] [stdout] 125 |  #[derive(Debug, ConstantTimeEq, ConstEq)]
[INFO] [stdout]     |                                  ^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstEq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `subtle` in the crate root
[INFO] [stdout]    --> src/lib.rs:125:18
[INFO] [stdout]     |
[INFO] [stdout] 125 |  #[derive(Debug, ConstantTimeEq, ConstEq)]
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstantTimeEq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - derive_ord_impls (line 249) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `subtle`
[INFO] [stdout]    --> src/lib.rs:253:34
[INFO] [stdout]     |
[INFO] [stdout] 253 |  #[derive(Debug, ConstantTimeEq, ConstantTimeGreater, ConstEq, ConstOrd)]
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstantTimeGreater` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `subtle`
[INFO] [stdout]    --> src/lib.rs:253:55
[INFO] [stdout]     |
[INFO] [stdout] 253 |  #[derive(Debug, ConstantTimeEq, ConstantTimeGreater, ConstEq, ConstOrd)]
[INFO] [stdout]     |                                                       ^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstEq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `subtle`
[INFO] [stdout]    --> src/lib.rs:253:64
[INFO] [stdout]     |
[INFO] [stdout] 253 |  #[derive(Debug, ConstantTimeEq, ConstantTimeGreater, ConstEq, ConstOrd)]
[INFO] [stdout]     |                                                                ^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstOrd` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `subtle` in the crate root
[INFO] [stdout]    --> src/lib.rs:253:18
[INFO] [stdout]     |
[INFO] [stdout] 253 |  #[derive(Debug, ConstantTimeEq, ConstantTimeGreater, ConstEq, ConstOrd)]
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstantTimeEq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `subtle` in the crate root
[INFO] [stdout]    --> src/lib.rs:253:34
[INFO] [stdout]     |
[INFO] [stdout] 253 |  #[derive(Debug, ConstantTimeEq, ConstantTimeGreater, ConstEq, ConstOrd)]
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the derive macro `ConstantTimeGreater` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - derive_eq (line 42) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `subtle`
[INFO] [stdout]   --> src/lib.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | use subtle::ConstantTimeEq;
[INFO] [stdout]    |     ^^^^^^ use of unresolved module or unlinked crate `subtle`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `subtle`, use `cargo add subtle` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `subtle` in the crate root
[INFO] [stdout]   --> src/lib.rs:47:11
[INFO] [stdout]    |
[INFO] [stdout] 47 |  #[derive(ConstantTimeEq)]
[INFO] [stdout]    |           ^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the derive macro `ConstantTimeEq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: cannot find `subtle` in the crate root
[INFO] [stdout]   --> src/lib.rs:55:11
[INFO] [stdout]    |
[INFO] [stdout] 55 |  #[derive(ConstantTimeEq)]
[INFO] [stdout]    |           ^^^^^^^^^^^^^^ could not find `subtle` in the list of imported crates
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the derive macro `ConstantTimeEq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - derive_eq (line 42)
[INFO] [stdout]     src/lib.rs - derive_eq_impls (line 121)
[INFO] [stdout]     src/lib.rs - derive_gt (line 163)
[INFO] [stdout]     src/lib.rs - derive_ord_impls (line 249)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.13s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "cc5b59ab72a5d709f8b33a9fd6bf89dcd2bd2b89ae99b4f43f932f594cb616d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc5b59ab72a5d709f8b33a9fd6bf89dcd2bd2b89ae99b4f43f932f594cb616d7", kill_on_drop: false }`
[INFO] [stdout] cc5b59ab72a5d709f8b33a9fd6bf89dcd2bd2b89ae99b4f43f932f594cb616d7
