[INFO] fetching crate reproto-derive 0.3.36... [INFO] checking reproto-derive-0.3.36 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar [INFO] extracting crate reproto-derive 0.3.36 into /workspace/builds/worker-1-tc1/source [INFO] validating manifest of crates.io crate reproto-derive 0.3.36 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate reproto-derive 0.3.36 [INFO] finished tweaking crates.io crate reproto-derive 0.3.36 [INFO] tweaked toml for crates.io crate reproto-derive 0.3.36 written to /workspace/builds/worker-1-tc1/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 57 packages [INFO] [stderr] Adding dtoa v0.4.8 (latest: v1.0.9) [INFO] [stderr] Adding idna v0.1.5 (latest: v0.5.0) [INFO] [stderr] Adding num-bigint v0.1.44 (latest: v0.4.4) [INFO] [stderr] Adding num-traits v0.1.43 (latest: v0.2.18) [INFO] [stderr] Adding object v0.32.2 (latest: v0.34.0) [INFO] [stderr] Adding percent-encoding v1.0.1 (latest: v2.3.1) [INFO] [stderr] Adding relative-path v0.3.7 (latest: v1.9.2) [INFO] [stderr] Adding ropey v0.6.3 (latest: v1.6.1) [INFO] [stderr] Adding serde_yaml v0.7.5 (latest: v0.9.34+deprecated) [INFO] [stderr] Adding smallvec v0.6.14 (latest: v1.13.2) [INFO] [stderr] Adding url v1.7.2 (latest: v2.5.0) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded reproto-core v0.3.36 [INFO] [stderr] Downloaded reproto-lexer v0.3.36 [INFO] [stderr] Downloaded reproto-ast v0.3.36 [INFO] [stderr] Downloaded reproto-semver v0.3.36 [INFO] [stderr] Downloaded ropey v0.6.3 [INFO] [stderr] Downloaded relative-path v0.3.7 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 11d93c00aa4ce4fbd246dcb2ccc3a3fd3b1acc6effc47adfc0c19bba4eb09508 [INFO] running `Command { std: "docker" "start" "-a" "11d93c00aa4ce4fbd246dcb2ccc3a3fd3b1acc6effc47adfc0c19bba4eb09508", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "11d93c00aa4ce4fbd246dcb2ccc3a3fd3b1acc6effc47adfc0c19bba4eb09508", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "11d93c00aa4ce4fbd246dcb2ccc3a3fd3b1acc6effc47adfc0c19bba4eb09508", kill_on_drop: false }` [INFO] [stdout] 11d93c00aa4ce4fbd246dcb2ccc3a3fd3b1acc6effc47adfc0c19bba4eb09508 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 139b96b97d46f2c6b5df219f10547480642448b08d64469db29b981fa92c8c93 [INFO] running `Command { std: "docker" "start" "-a" "139b96b97d46f2c6b5df219f10547480642448b08d64469db29b981fa92c8c93", kill_on_drop: false }` [INFO] [stderr] Compiling serde v1.0.197 [INFO] [stderr] Checking memchr v2.7.2 [INFO] [stderr] Compiling autocfg v1.2.0 [INFO] [stderr] Compiling proc-macro2 v1.0.79 [INFO] [stderr] Checking tinyvec_macros v0.1.1 [INFO] [stderr] Compiling maybe-uninit v2.0.0 [INFO] [stderr] Compiling libc v0.2.153 [INFO] [stderr] Compiling cc v1.0.90 [INFO] [stderr] Checking adler v1.0.2 [INFO] [stderr] Checking gimli v0.28.1 [INFO] [stderr] Checking unicode-bidi v0.3.15 [INFO] [stderr] Checking matches v0.1.10 [INFO] [stderr] Checking unicode-segmentation v1.11.0 [INFO] [stderr] Checking percent-encoding v1.0.1 [INFO] [stderr] Checking rustc-demangle v0.1.23 [INFO] [stderr] Checking regex-syntax v0.8.3 [INFO] [stderr] Checking tinyvec v1.6.0 [INFO] [stderr] Checking equivalent v1.0.1 [INFO] [stderr] Checking miniz_oxide v0.7.2 [INFO] [stderr] Checking hashbrown v0.14.3 [INFO] [stderr] Compiling serde_json v1.0.115 [INFO] [stderr] Checking ryu v1.0.17 [INFO] [stderr] Checking dtoa v0.4.8 [INFO] [stderr] Checking itoa v1.0.11 [INFO] [stderr] Checking object v0.32.2 [INFO] [stderr] Checking aho-corasick v1.1.3 [INFO] [stderr] Compiling num-traits v0.2.18 [INFO] [stderr] Checking smallvec v0.6.14 [INFO] [stderr] Checking ropey v0.6.3 [INFO] [stderr] Checking unicode-normalization v0.1.23 [INFO] [stderr] Compiling quote v1.0.35 [INFO] [stderr] Compiling backtrace v0.3.71 [INFO] [stderr] Compiling syn v2.0.58 [INFO] [stderr] Checking indexmap v2.2.6 [INFO] [stderr] Checking idna v0.1.5 [INFO] [stderr] Checking url v1.7.2 [INFO] [stderr] Checking addr2line v0.21.0 [INFO] [stderr] Checking num-integer v0.1.46 [INFO] [stderr] Checking num-traits v0.1.43 [INFO] [stderr] Checking regex-automata v0.4.6 [INFO] [stderr] Checking num-bigint v0.1.44 [INFO] [stderr] Checking linked-hash-map v0.5.6 [INFO] [stderr] Checking reproto-semver v0.3.36 [INFO] [stderr] Checking relative-path v0.3.7 [INFO] [stderr] Checking yaml-rust v0.4.5 [INFO] [stderr] Compiling serde_derive v1.0.197 [INFO] [stderr] Checking serde_yaml v0.7.5 [INFO] [stderr] Checking regex v1.10.4 [INFO] [stderr] Checking Inflector v0.11.4 [INFO] [stderr] Checking reproto-core v0.3.36 [INFO] [stderr] Checking reproto-lexer v0.3.36 [INFO] [stderr] Checking reproto-ast v0.3.36 [INFO] [stderr] Checking reproto-derive v0.3.36 (/opt/rustwide/workdir) [INFO] [stdout] warning: the item `core` is imported redundantly [INFO] [stdout] --> format.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use core; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] ::: lib.rs:4:1 [INFO] [stdout] | [INFO] [stdout] 4 | extern crate reproto_core as core; [INFO] [stdout] | ---------------------------------- the item `core` is already imported here [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `core` is imported redundantly [INFO] [stdout] --> json.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use core; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] ::: lib.rs:4:1 [INFO] [stdout] | [INFO] [stdout] 4 | extern crate reproto_core as core; [INFO] [stdout] | ---------------------------------- the item `core` is already imported here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `core` is imported redundantly [INFO] [stdout] --> yaml.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use core; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] ::: lib.rs:4:1 [INFO] [stdout] | [INFO] [stdout] 4 | extern crate reproto_core as core; [INFO] [stdout] | ---------------------------------- the item `core` is already imported here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> lib.rs:37:17 [INFO] [stdout] | [INFO] [stdout] 37 | format: Box, [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 37 | format: Box, [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `core` is imported redundantly [INFO] [stdout] --> format.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use core; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] ::: lib.rs:4:1 [INFO] [stdout] | [INFO] [stdout] 4 | extern crate reproto_core as core; [INFO] [stdout] | ---------------------------------- the item `core` is already imported here [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `core` is imported redundantly [INFO] [stdout] --> json.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use core; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] ::: lib.rs:4:1 [INFO] [stdout] | [INFO] [stdout] 4 | extern crate reproto_core as core; [INFO] [stdout] | ---------------------------------- the item `core` is already imported here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `core` is imported redundantly [INFO] [stdout] --> yaml.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use core; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] ::: lib.rs:4:1 [INFO] [stdout] | [INFO] [stdout] 4 | extern crate reproto_core as core; [INFO] [stdout] | ---------------------------------- the item `core` is already imported here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> format.rs:22:36 [INFO] [stdout] | [INFO] [stdout] 22 | fn as_object(&self) -> Option<&Object>; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 22 | fn as_object(&self) -> Option<&dyn Object>; [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> lib.rs:37:17 [INFO] [stdout] | [INFO] [stdout] 37 | format: Box, [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 37 | format: Box, [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> lib.rs:84:21 [INFO] [stdout] | [INFO] [stdout] 84 | format: Box, [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 84 | format: Box, [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> json.rs:37:36 [INFO] [stdout] | [INFO] [stdout] 37 | fn as_object(&self) -> Option<&format::Object> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 37 | fn as_object(&self) -> Option<&dyn format::Object> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> format.rs:22:36 [INFO] [stdout] | [INFO] [stdout] 22 | fn as_object(&self) -> Option<&Object>; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 22 | fn as_object(&self) -> Option<&dyn Object>; [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> yaml.rs:29:36 [INFO] [stdout] | [INFO] [stdout] 29 | fn as_object(&self) -> Option<&format::Object> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 29 | fn as_object(&self) -> Option<&dyn format::Object> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> lib.rs:84:21 [INFO] [stdout] | [INFO] [stdout] 84 | format: Box, [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 84 | format: Box, [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> json.rs:39:64 [INFO] [stdout] | [INFO] [stdout] 39 | json::Value::Object(ref object) => Some(object as &format::Object), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 39 | json::Value::Object(ref object) => Some(object as &dyn format::Object), [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> json.rs:37:36 [INFO] [stdout] | [INFO] [stdout] 37 | fn as_object(&self) -> Option<&format::Object> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 37 | fn as_object(&self) -> Option<&dyn format::Object> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> yaml.rs:29:36 [INFO] [stdout] | [INFO] [stdout] 29 | fn as_object(&self) -> Option<&format::Object> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 29 | fn as_object(&self) -> Option<&dyn format::Object> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> json.rs:39:64 [INFO] [stdout] | [INFO] [stdout] 39 | json::Value::Object(ref object) => Some(object as &format::Object), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 39 | json::Value::Object(ref object) => Some(object as &dyn format::Object), [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> yaml.rs:31:67 [INFO] [stdout] | [INFO] [stdout] 31 | yaml::Value::Mapping(ref mapping) => Some(mapping as &format::Object), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 31 | yaml::Value::Mapping(ref mapping) => Some(mapping as &dyn format::Object), [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> yaml.rs:31:67 [INFO] [stdout] | [INFO] [stdout] 31 | yaml::Value::Mapping(ref mapping) => Some(mapping as &format::Object), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see [INFO] [stdout] help: if this is an object-safe trait, use `dyn` [INFO] [stdout] | [INFO] [stdout] 31 | yaml::Value::Mapping(ref mapping) => Some(mapping as &dyn format::Object), [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> sir.rs:105:13 [INFO] [stdout] | [INFO] [stdout] 105 | mem::replace(self, replace); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the resulting value [INFO] [stdout] | [INFO] [stdout] 105 | let _ = mem::replace(self, replace); [INFO] [stdout] | +++++++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 11 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> sir.rs:105:13 [INFO] [stdout] | [INFO] [stdout] 105 | mem::replace(self, replace); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the resulting value [INFO] [stdout] | [INFO] [stdout] 105 | let _ = mem::replace(self, replace); [INFO] [stdout] | +++++++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 11 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.44s [INFO] running `Command { std: "docker" "inspect" "139b96b97d46f2c6b5df219f10547480642448b08d64469db29b981fa92c8c93", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "139b96b97d46f2c6b5df219f10547480642448b08d64469db29b981fa92c8c93", kill_on_drop: false }` [INFO] [stdout] 139b96b97d46f2c6b5df219f10547480642448b08d64469db29b981fa92c8c93