[INFO] fetching crate ibuilder 0.1.8... [INFO] checking ibuilder-0.1.8 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170 [INFO] extracting crate ibuilder 0.1.8 into /workspace/builds/worker-3-tc1/source [INFO] started tweaking crates.io crate ibuilder 0.1.8 [INFO] finished tweaking crates.io crate ibuilder 0.1.8 [INFO] tweaked toml for crates.io crate ibuilder 0.1.8 written to /workspace/builds/worker-3-tc1/source/Cargo.toml [INFO] validating manifest of crates.io crate ibuilder 0.1.8 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "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" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 61 packages to latest compatible versions [INFO] [stderr] Adding rand v0.7.3 (available: v0.9.1) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded ibuilder_derive v0.1.8 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 60a38b77374f8cf5eb38315f0afb9374337786b64a8a29610587b73406cd8496 [INFO] running `Command { std: "docker" "start" "-a" "60a38b77374f8cf5eb38315f0afb9374337786b64a8a29610587b73406cd8496", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "60a38b77374f8cf5eb38315f0afb9374337786b64a8a29610587b73406cd8496", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "60a38b77374f8cf5eb38315f0afb9374337786b64a8a29610587b73406cd8496", kill_on_drop: false }` [INFO] [stdout] 60a38b77374f8cf5eb38315f0afb9374337786b64a8a29610587b73406cd8496 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 1bfcf3078428fa7e35333f16822f4658fe1d762e0ae035a79f0c067623972826 [INFO] running `Command { std: "docker" "start" "-a" "1bfcf3078428fa7e35333f16822f4658fe1d762e0ae035a79f0c067623972826", kill_on_drop: false }` [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Compiling proc-macro-error-attr v1.0.4 [INFO] [stderr] Compiling proc-macro-error v1.0.4 [INFO] [stderr] Compiling failure_derive v0.1.8 [INFO] [stderr] Checking getrandom v0.1.16 [INFO] [stderr] Checking object v0.36.7 [INFO] [stderr] Checking toml_datetime v0.6.11 [INFO] [stderr] Checking serde_spanned v0.6.9 [INFO] [stderr] Checking winnow v0.7.11 [INFO] [stderr] Checking toml_write v0.1.2 [INFO] [stderr] Checking rand_core v0.5.1 [INFO] [stderr] Compiling syn v2.0.104 [INFO] [stderr] Checking rand_chacha v0.2.2 [INFO] [stderr] Checking rand v0.7.3 [INFO] [stderr] Checking toml_edit v0.22.27 [INFO] [stderr] Compiling synstructure v0.12.6 [INFO] [stderr] Compiling ibuilder_derive v0.1.8 [INFO] [stderr] Compiling serde_derive v1.0.219 [INFO] [stderr] Checking toml v0.8.23 [INFO] [stderr] Checking backtrace v0.3.75 [INFO] [stderr] Checking failure v0.1.8 [INFO] [stderr] Checking ibuilder v0.1.8 (/opt/rustwide/workdir) [INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item [INFO] [stdout] --> src/lib.rs:382:17 [INFO] [stdout] | [INFO] [stdout] 382 | #[derive(Debug, Fail, Eq, PartialEq)] [INFO] [stdout] | ^--- [INFO] [stdout] | | [INFO] [stdout] | `Fail` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_DERIVE_failure_Fail_FOR_ChooseError` [INFO] [stdout] 383 | pub enum ChooseError { [INFO] [stdout] | ----------- `ChooseError` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive` [INFO] [stdout] = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl` [INFO] [stdout] = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint [INFO] [stdout] = note: `#[warn(non_local_definitions)]` on by default [INFO] [stdout] = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item [INFO] [stdout] --> src/lib.rs:382:17 [INFO] [stdout] | [INFO] [stdout] 382 | #[derive(Debug, Fail, Eq, PartialEq)] [INFO] [stdout] | ^--- [INFO] [stdout] | | [INFO] [stdout] | `Display` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_DERIVE_failure_core_fmt_Display_FOR_ChooseError` [INFO] [stdout] 383 | pub enum ChooseError { [INFO] [stdout] | ----------- `ChooseError` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive` [INFO] [stdout] = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl` [INFO] [stdout] = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint [INFO] [stdout] = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item [INFO] [stdout] --> src/lib.rs:396:17 [INFO] [stdout] | [INFO] [stdout] 396 | #[derive(Debug, Fail, Eq, PartialEq)] [INFO] [stdout] | ^--- [INFO] [stdout] | | [INFO] [stdout] | `Fail` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_DERIVE_failure_Fail_FOR_FinalizeError` [INFO] [stdout] 397 | pub enum FinalizeError { [INFO] [stdout] | ------------- `FinalizeError` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive` [INFO] [stdout] = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl` [INFO] [stdout] = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint [INFO] [stdout] = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item [INFO] [stdout] --> src/lib.rs:396:17 [INFO] [stdout] | [INFO] [stdout] 396 | #[derive(Debug, Fail, Eq, PartialEq)] [INFO] [stdout] | ^--- [INFO] [stdout] | | [INFO] [stdout] | `Display` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_DERIVE_failure_core_fmt_Display_FOR_FinalizeError` [INFO] [stdout] 397 | pub enum FinalizeError { [INFO] [stdout] | ------------- `FinalizeError` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive` [INFO] [stdout] = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl` [INFO] [stdout] = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint [INFO] [stdout] = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking trybuild v1.0.105 [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> tests/unnamed_field.rs:4:13 [INFO] [stdout] | [INFO] [stdout] 4 | struct Test(i64); [INFO] [stdout] | ---- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] = note: `Test` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `field` and `lol` are never read [INFO] [stdout] --> tests/enum.rs:7:9 [INFO] [stdout] | [INFO] [stdout] 6 | Var2 { [INFO] [stdout] | ---- fields in this variant [INFO] [stdout] 7 | field: i32, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 8 | #[ibuilder(default = "ciao")] [INFO] [stdout] 9 | lol: String, [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Enum` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> tests/enum.rs:11:10 [INFO] [stdout] | [INFO] [stdout] 11 | Var3(i32), [INFO] [stdout] | ---- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Enum` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 11 - Var3(i32), [INFO] [stdout] 11 + Var3(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `integer`, `defaulted`, `inner`, and `en` are never read [INFO] [stdout] --> tests/random.rs:8:5 [INFO] [stdout] | [INFO] [stdout] 7 | struct Base { [INFO] [stdout] | ---- fields in this struct [INFO] [stdout] 8 | integer: i32, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] 9 | #[ibuilder(default = 42)] [INFO] [stdout] 10 | defaulted: i32, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] 11 | inner: Inner, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 12 | #[ibuilder(rename = "enum")] [INFO] [stdout] 13 | en: Enum, [INFO] [stdout] | ^^ [INFO] [stdout] | [INFO] [stdout] = note: `Base` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `string` and `defaulted` are never read [INFO] [stdout] --> tests/random.rs:19:5 [INFO] [stdout] | [INFO] [stdout] 18 | struct Inner { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] 19 | string: Option, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] 20 | #[ibuilder(default = "lol")] [INFO] [stdout] 21 | defaulted: String, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Inner` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `field` and `field2` are never read [INFO] [stdout] --> tests/random.rs:31:9 [INFO] [stdout] | [INFO] [stdout] 29 | Var2 { [INFO] [stdout] | ---- fields in this variant [INFO] [stdout] 30 | #[ibuilder(hidden, default = "nope")] [INFO] [stdout] 31 | field: String, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 32 | #[ibuilder(rename = "baz")] [INFO] [stdout] 33 | field2: Inner, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Enum` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> tests/random.rs:35:10 [INFO] [stdout] | [INFO] [stdout] 35 | Var3(Inner), [INFO] [stdout] | ---- ^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Enum` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 35 - Var3(Inner), [INFO] [stdout] 35 + Var3(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> tests/random.rs:37:10 [INFO] [stdout] | [INFO] [stdout] 37 | Var4(Vec>>>>>>), [INFO] [stdout] | ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] = note: `Enum` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 37 - Var4(Vec>>>>>>), [INFO] [stdout] 37 + Var4(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item [INFO] [stdout] --> src/lib.rs:382:17 [INFO] [stdout] | [INFO] [stdout] 382 | #[derive(Debug, Fail, Eq, PartialEq)] [INFO] [stdout] | ^--- [INFO] [stdout] | | [INFO] [stdout] | `Fail` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_DERIVE_failure_Fail_FOR_ChooseError` [INFO] [stdout] 383 | pub enum ChooseError { [INFO] [stdout] | ----------- `ChooseError` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive` [INFO] [stdout] = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl` [INFO] [stdout] = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint [INFO] [stdout] = note: `#[warn(non_local_definitions)]` on by default [INFO] [stdout] = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item [INFO] [stdout] --> src/lib.rs:382:17 [INFO] [stdout] | [INFO] [stdout] 382 | #[derive(Debug, Fail, Eq, PartialEq)] [INFO] [stdout] | ^--- [INFO] [stdout] | | [INFO] [stdout] | `Display` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_DERIVE_failure_core_fmt_Display_FOR_ChooseError` [INFO] [stdout] 383 | pub enum ChooseError { [INFO] [stdout] | ----------- `ChooseError` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive` [INFO] [stdout] = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl` [INFO] [stdout] = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint [INFO] [stdout] = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item [INFO] [stdout] --> src/lib.rs:396:17 [INFO] [stdout] | [INFO] [stdout] 396 | #[derive(Debug, Fail, Eq, PartialEq)] [INFO] [stdout] | ^--- [INFO] [stdout] | | [INFO] [stdout] | `Fail` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_DERIVE_failure_Fail_FOR_FinalizeError` [INFO] [stdout] 397 | pub enum FinalizeError { [INFO] [stdout] | ------------- `FinalizeError` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive` [INFO] [stdout] = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl` [INFO] [stdout] = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint [INFO] [stdout] = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item [INFO] [stdout] --> src/lib.rs:396:17 [INFO] [stdout] | [INFO] [stdout] 396 | #[derive(Debug, Fail, Eq, PartialEq)] [INFO] [stdout] | ^--- [INFO] [stdout] | | [INFO] [stdout] | `Display` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_DERIVE_failure_core_fmt_Display_FOR_FinalizeError` [INFO] [stdout] 397 | pub enum FinalizeError { [INFO] [stdout] | ------------- `FinalizeError` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive` [INFO] [stdout] = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl` [INFO] [stdout] = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint [INFO] [stdout] = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 25.13s [INFO] running `Command { std: "docker" "inspect" "1bfcf3078428fa7e35333f16822f4658fe1d762e0ae035a79f0c067623972826", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1bfcf3078428fa7e35333f16822f4658fe1d762e0ae035a79f0c067623972826", kill_on_drop: false }` [INFO] [stdout] 1bfcf3078428fa7e35333f16822f4658fe1d762e0ae035a79f0c067623972826