[INFO] cloning repository https://github.com/cameronp98/multiping [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cameronp98/multiping" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcameronp98%2Fmultiping", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcameronp98%2Fmultiping'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 714fd069127761b289bc3b84f35afbaaa8e912c9 [INFO] checking cameronp98/multiping against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcameronp98%2Fmultiping" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/cameronp98/multiping [INFO] finished tweaking git repo https://github.com/cameronp98/multiping [INFO] tweaked toml for git repo https://github.com/cameronp98/multiping written to /workspace/builds/worker-0-tc1/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/cameronp98/multiping on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/cameronp98/multiping already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded quote v0.6.13 [INFO] [stderr] Downloaded atty v0.2.13 [INFO] [stderr] Downloaded bitflags v1.1.0 [INFO] [stderr] Downloaded humantime v1.2.0 [INFO] [stderr] Downloaded ansi_term v0.11.0 [INFO] [stderr] Downloaded env_logger v0.6.2 [INFO] [stderr] Downloaded aho-corasick v0.7.4 [INFO] [stderr] Downloaded serde v1.0.98 [INFO] [stderr] Downloaded serde_derive v1.0.98 [INFO] [stderr] Downloaded syn v0.15.42 [INFO] [stderr] Downloaded log v0.4.8 [INFO] [stderr] Downloaded ryu v1.0.0 [INFO] [stderr] Downloaded clap v2.33.0 [INFO] [stderr] Downloaded proc-macro2 v0.4.30 [INFO] [stderr] Downloaded regex v1.2.0 [INFO] [stderr] Downloaded serde_json v1.0.40 [INFO] [stderr] Downloaded regex-syntax v0.6.10 [INFO] [stderr] Downloaded unicode-width v0.1.5 [INFO] [stderr] Downloaded vec_map v0.8.1 [INFO] [stderr] Downloaded libc v0.2.60 [INFO] [stderr] Downloaded ucd-util v0.1.5 [INFO] [stderr] Downloaded lazy_static v1.3.0 [INFO] [stderr] Downloaded memchr v2.2.1 [INFO] [stderr] Downloaded utf8-ranges v1.0.3 [INFO] [stderr] Downloaded termcolor v1.0.5 [INFO] [stderr] Downloaded itoa v0.4.4 [INFO] [stderr] Downloaded thread_local v0.3.6 [INFO] [stderr] Downloaded wincolor v1.0.1 [INFO] [stderr] Downloaded cfg-if v0.1.9 [INFO] [stderr] Downloaded winapi-util v0.1.2 [INFO] [stderr] Downloaded winapi v0.3.7 [INFO] [stderr] Downloaded quick-error v1.2.2 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] be30ecf739ca9ade75a40c2991274249a11f886f42bef30b96acc8f8c0d97495 [INFO] running `Command { std: "docker" "start" "-a" "be30ecf739ca9ade75a40c2991274249a11f886f42bef30b96acc8f8c0d97495", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "be30ecf739ca9ade75a40c2991274249a11f886f42bef30b96acc8f8c0d97495", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "be30ecf739ca9ade75a40c2991274249a11f886f42bef30b96acc8f8c0d97495", kill_on_drop: false }` [INFO] [stdout] be30ecf739ca9ade75a40c2991274249a11f886f42bef30b96acc8f8c0d97495 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] a6e4d27cd62dade8487832663031aedb5e84eb2284ee8679f2a18b2a8ffd8264 [INFO] running `Command { std: "docker" "start" "-a" "a6e4d27cd62dade8487832663031aedb5e84eb2284ee8679f2a18b2a8ffd8264", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v0.4.30 [INFO] [stderr] Compiling unicode-xid v0.1.0 [INFO] [stderr] Compiling libc v0.2.60 [INFO] [stderr] Compiling syn v0.15.42 [INFO] [stderr] Compiling memchr v2.2.1 [INFO] [stderr] Checking lazy_static v1.3.0 [INFO] [stderr] Compiling serde v1.0.98 [INFO] [stderr] Checking ucd-util v0.1.5 [INFO] [stderr] Compiling log v0.4.8 [INFO] [stderr] Compiling ryu v1.0.0 [INFO] [stderr] Checking quick-error v1.2.2 [INFO] [stderr] Checking cfg-if v0.1.9 [INFO] [stderr] Checking utf8-ranges v1.0.3 [INFO] [stderr] Checking itoa v0.4.4 [INFO] [stderr] Checking termcolor v1.0.5 [INFO] [stderr] Compiling bitflags v1.1.0 [INFO] [stderr] Checking thread_local v0.3.6 [INFO] [stderr] Checking unicode-width v0.1.5 [INFO] [stderr] Checking vec_map v0.8.1 [INFO] [stderr] Checking humantime v1.2.0 [INFO] [stderr] Checking ansi_term v0.11.0 [INFO] [stderr] Checking regex-syntax v0.6.10 [INFO] [stderr] Checking textwrap v0.11.0 [INFO] [stderr] Checking strsim v0.8.0 [INFO] [stderr] Checking aho-corasick v0.7.4 [INFO] [stderr] Compiling quote v0.6.13 [INFO] [stderr] Checking atty v0.2.13 [INFO] [stderr] Checking clap v2.33.0 [INFO] [stderr] Checking regex v1.2.0 [INFO] [stderr] Compiling serde_derive v1.0.98 [INFO] [stderr] Checking env_logger v0.6.2 [INFO] [stderr] Checking serde_json v1.0.40 [INFO] [stderr] Checking multiping v0.1.0 (/opt/rustwide/workdir/multiping) [INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy` [INFO] [stdout] --> multiping/src/message.rs:11:24 [INFO] [stdout] | [INFO] [stdout] 11 | #[derive(Debug, Clone, Deserialize, Serialize)] [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: no expected values for `feature` [INFO] [stdout] = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate [INFO] [stdout] = help: try referring to `Deserialize` crate for guidance on how handle this unexpected cfg [INFO] [stdout] = help: the derive macro `Deserialize` may come from an old version of the `serde_derive` crate, try updating your dependency with `cargo update -p serde_derive` [INFO] [stdout] = note: see for more information about checking conditional configuration [INFO] [stdout] = note: `#[warn(unexpected_cfgs)]` on by default [INFO] [stdout] = note: this warning originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy` [INFO] [stdout] --> multiping/src/message.rs:11:37 [INFO] [stdout] | [INFO] [stdout] 11 | #[derive(Debug, Clone, Deserialize, Serialize)] [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: no expected values for `feature` [INFO] [stdout] = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate [INFO] [stdout] = help: try referring to `Serialize` crate for guidance on how handle this unexpected cfg [INFO] [stdout] = help: the derive macro `Serialize` may come from an old version of the `serde_derive` crate, try updating your dependency with `cargo update -p serde_derive` [INFO] [stdout] = note: see for more information about checking conditional configuration [INFO] [stdout] = note: this warning originates in the derive macro `Serialize` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable statement [INFO] [stdout] --> multiping/src/connection.rs:103:9 [INFO] [stdout] | [INFO] [stdout] 94 | / match self.send_tx.send(Action::Forward(msg)) { [INFO] [stdout] 95 | | Ok(()) => unimplemented!(), [INFO] [stdout] 96 | | Err(e) => { [INFO] [stdout] ... | [INFO] [stdout] 101 | | } [INFO] [stdout] | |_________- any code following this `match` expression is unreachable, as all arms diverge [INFO] [stdout] 102 | [INFO] [stdout] 103 | debug!("message forwarded"); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unreachable_code)]` on by default [INFO] [stdout] = note: this warning originates in the macro `log` which comes from the expansion of the macro `debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy` [INFO] [stdout] --> multiping/src/message.rs:11:24 [INFO] [stdout] | [INFO] [stdout] 11 | #[derive(Debug, Clone, Deserialize, Serialize)] [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: no expected values for `feature` [INFO] [stdout] = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate [INFO] [stdout] = help: try referring to `Deserialize` crate for guidance on how handle this unexpected cfg [INFO] [stdout] = help: the derive macro `Deserialize` may come from an old version of the `serde_derive` crate, try updating your dependency with `cargo update -p serde_derive` [INFO] [stdout] = note: see for more information about checking conditional configuration [INFO] [stdout] = note: `#[warn(unexpected_cfgs)]` on by default [INFO] [stdout] = note: this warning originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unexpected `cfg` condition value: `cargo-clippy` [INFO] [stdout] --> multiping/src/message.rs:11:37 [INFO] [stdout] | [INFO] [stdout] 11 | #[derive(Debug, Clone, Deserialize, Serialize)] [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: no expected values for `feature` [INFO] [stdout] = note: using a cfg inside a derive macro will use the cfgs from the destination crate and not the ones from the defining crate [INFO] [stdout] = help: try referring to `Serialize` crate for guidance on how handle this unexpected cfg [INFO] [stdout] = help: the derive macro `Serialize` may come from an old version of the `serde_derive` crate, try updating your dependency with `cargo update -p serde_derive` [INFO] [stdout] = note: see for more information about checking conditional configuration [INFO] [stdout] = note: this warning originates in the derive macro `Serialize` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable statement [INFO] [stdout] --> multiping/src/connection.rs:103:9 [INFO] [stdout] | [INFO] [stdout] 94 | / match self.send_tx.send(Action::Forward(msg)) { [INFO] [stdout] 95 | | Ok(()) => unimplemented!(), [INFO] [stdout] 96 | | Err(e) => { [INFO] [stdout] ... | [INFO] [stdout] 101 | | } [INFO] [stdout] | |_________- any code following this `match` expression is unreachable, as all arms diverge [INFO] [stdout] 102 | [INFO] [stdout] 103 | debug!("message forwarded"); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unreachable_code)]` on by default [INFO] [stdout] = note: this warning originates in the macro `log` which comes from the expansion of the macro `debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: hiding a lifetime that's named elsewhere is confusing [INFO] [stdout] --> multiping/src/client.rs:13:30 [INFO] [stdout] | [INFO] [stdout] 13 | pub fn new(server_addr: &'a str) -> Client { [INFO] [stdout] | ^^ ------ the same lifetime is hidden here [INFO] [stdout] | | [INFO] [stdout] | the lifetime is named here [INFO] [stdout] | [INFO] [stdout] = help: the same lifetime is referred to in inconsistent ways, making the signature confusing [INFO] [stdout] = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default [INFO] [stdout] help: consistently use `'a` [INFO] [stdout] | [INFO] [stdout] 13 | pub fn new(server_addr: &'a str) -> Client<'a> { [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] --> multiping/src/message.rs:11:24 [INFO] [stdout] | [INFO] [stdout] 11 | #[derive(Debug, Clone, Deserialize, Serialize)] [INFO] [stdout] | ^---------- [INFO] [stdout] | | [INFO] [stdout] | `Deserialize` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_IMPL_DESERIALIZE_FOR_Message` [INFO] [stdout] 12 | pub enum Message { [INFO] [stdout] | ------- `Message` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Deserialize` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Deserialize` may come from an old version of the `serde_derive` crate, try updating your dependency with `cargo update -p serde_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 `Deserialize` (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] --> multiping/src/message.rs:11:37 [INFO] [stdout] | [INFO] [stdout] 11 | #[derive(Debug, Clone, Deserialize, Serialize)] [INFO] [stdout] | ^-------- [INFO] [stdout] | | [INFO] [stdout] | `Serialize` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_IMPL_SERIALIZE_FOR_Message` [INFO] [stdout] 12 | pub enum Message { [INFO] [stdout] | ------- `Message` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Serialize` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Serialize` may come from an old version of the `serde_derive` crate, try updating your dependency with `cargo update -p serde_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 `Serialize` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing [INFO] [stdout] --> multiping/src/server.rs:30:24 [INFO] [stdout] | [INFO] [stdout] 30 | pub fn connections(&mut self) -> MutexGuard { [INFO] [stdout] | ^^^^^^^^^ ------------------------------ the same lifetime is hidden here [INFO] [stdout] | | [INFO] [stdout] | the lifetime is elided here [INFO] [stdout] | [INFO] [stdout] = help: the same lifetime is referred to in inconsistent ways, making the signature confusing [INFO] [stdout] help: use `'_` for type paths [INFO] [stdout] | [INFO] [stdout] 30 | pub fn connections(&mut self) -> MutexGuard<'_, ConnectionRegistry> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking client v0.1.0 (/opt/rustwide/workdir/client) [INFO] [stderr] Checking server v0.1.0 (/opt/rustwide/workdir/server) [INFO] [stdout] warning: hiding a lifetime that's named elsewhere is confusing [INFO] [stdout] --> multiping/src/client.rs:13:30 [INFO] [stdout] | [INFO] [stdout] 13 | pub fn new(server_addr: &'a str) -> Client { [INFO] [stdout] | ^^ ------ the same lifetime is hidden here [INFO] [stdout] | | [INFO] [stdout] | the lifetime is named here [INFO] [stdout] | [INFO] [stdout] = help: the same lifetime is referred to in inconsistent ways, making the signature confusing [INFO] [stdout] = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default [INFO] [stdout] help: consistently use `'a` [INFO] [stdout] | [INFO] [stdout] 13 | pub fn new(server_addr: &'a str) -> Client<'a> { [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] --> multiping/src/message.rs:11:24 [INFO] [stdout] | [INFO] [stdout] 11 | #[derive(Debug, Clone, Deserialize, Serialize)] [INFO] [stdout] | ^---------- [INFO] [stdout] | | [INFO] [stdout] | `Deserialize` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_IMPL_DESERIALIZE_FOR_Message` [INFO] [stdout] 12 | pub enum Message { [INFO] [stdout] | ------- `Message` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Deserialize` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Deserialize` may come from an old version of the `serde_derive` crate, try updating your dependency with `cargo update -p serde_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 `Deserialize` (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] --> multiping/src/message.rs:11:37 [INFO] [stdout] | [INFO] [stdout] 11 | #[derive(Debug, Clone, Deserialize, Serialize)] [INFO] [stdout] | ^-------- [INFO] [stdout] | | [INFO] [stdout] | `Serialize` is not local [INFO] [stdout] | move the `impl` block outside of this constant `_IMPL_SERIALIZE_FOR_Message` [INFO] [stdout] 12 | pub enum Message { [INFO] [stdout] | ------- `Message` is not local [INFO] [stdout] | [INFO] [stdout] = note: the derive macro `Serialize` defines the non-local `impl`, and may need to be changed [INFO] [stdout] = note: the derive macro `Serialize` may come from an old version of the `serde_derive` crate, try updating your dependency with `cargo update -p serde_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 `Serialize` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing [INFO] [stdout] --> multiping/src/server.rs:30:24 [INFO] [stdout] | [INFO] [stdout] 30 | pub fn connections(&mut self) -> MutexGuard { [INFO] [stdout] | ^^^^^^^^^ ------------------------------ the same lifetime is hidden here [INFO] [stdout] | | [INFO] [stdout] | the lifetime is elided here [INFO] [stdout] | [INFO] [stdout] = help: the same lifetime is referred to in inconsistent ways, making the signature confusing [INFO] [stdout] help: use `'_` for type paths [INFO] [stdout] | [INFO] [stdout] 30 | pub fn connections(&mut self) -> MutexGuard<'_, ConnectionRegistry> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.52s [INFO] running `Command { std: "docker" "inspect" "a6e4d27cd62dade8487832663031aedb5e84eb2284ee8679f2a18b2a8ffd8264", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a6e4d27cd62dade8487832663031aedb5e84eb2284ee8679f2a18b2a8ffd8264", kill_on_drop: false }` [INFO] [stdout] a6e4d27cd62dade8487832663031aedb5e84eb2284ee8679f2a18b2a8ffd8264