[INFO] cloning repository https://github.com/ruggeri/rust_learning [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ruggeri/rust_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fruggeri%2Frust_learning", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fruggeri%2Frust_learning'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 6564c9e695a39cf690d74e0eb370d542f146007c [INFO] checking ruggeri/rust_learning against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fruggeri%2Frust_learning" "/workspace/builds/worker-9/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/ruggeri/rust_learning on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/ruggeri/rust_learning [INFO] finished tweaking git repo https://github.com/ruggeri/rust_learning [INFO] tweaked toml for git repo https://github.com/ruggeri/rust_learning written to /workspace/builds/worker-9/source/Cargo.toml [INFO] crate git repo https://github.com/ruggeri/rust_learning already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] b8e960642e88d73dbad5a9d378254636b8428f795b3db1cd63eabe4b0ef47eed [INFO] running `Command { std: "docker" "start" "-a" "b8e960642e88d73dbad5a9d378254636b8428f795b3db1cd63eabe4b0ef47eed", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "b8e960642e88d73dbad5a9d378254636b8428f795b3db1cd63eabe4b0ef47eed", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b8e960642e88d73dbad5a9d378254636b8428f795b3db1cd63eabe4b0ef47eed", kill_on_drop: false }` [INFO] [stdout] b8e960642e88d73dbad5a9d378254636b8428f795b3db1cd63eabe4b0ef47eed [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 3685e8bd3d390486d030135993770853687693e674482ce06752bc3771221332 [INFO] running `Command { std: "docker" "start" "-a" "3685e8bd3d390486d030135993770853687693e674482ce06752bc3771221332", kill_on_drop: false }` [INFO] [stderr] Checking rust_learning v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error[E0499]: cannot borrow `*self` as mutable more than once at a time [INFO] [stdout] --> src/bst/bst.rs:79:61 [INFO] [stdout] | [INFO] [stdout] 75 | fn find_mut(&mut self, t: &T) -> &mut BST { [INFO] [stdout] | - let's call the lifetime of this reference `'1` [INFO] [stdout] 76 | / match self { [INFO] [stdout] 77 | | Nil => self, [INFO] [stdout] 78 | | Node(NodeData { value, left, .. }) if *t < *value => left.find_mut(t), [INFO] [stdout] | | ---- first mutable borrow occurs here [INFO] [stdout] 79 | | Node(NodeData { value, .. }) if *t == *value => self, [INFO] [stdout] | | ^^^^ second mutable borrow occurs here [INFO] [stdout] 80 | | Node(NodeData { value, right, .. }) if *value < *t => right.find_mut(t), [INFO] [stdout] 81 | | Node(_) => unreachable!(), [INFO] [stdout] 82 | | } [INFO] [stdout] | |_________- returning this value requires that `self.0.left` is borrowed for `'1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0499]: cannot borrow `*self` as mutable more than once at a time [INFO] [stdout] --> src/bst/bst.rs:79:61 [INFO] [stdout] | [INFO] [stdout] 75 | fn find_mut(&mut self, t: &T) -> &mut BST { [INFO] [stdout] | - let's call the lifetime of this reference `'1` [INFO] [stdout] 76 | / match self { [INFO] [stdout] 77 | | Nil => self, [INFO] [stdout] 78 | | Node(NodeData { value, left, .. }) if *t < *value => left.find_mut(t), [INFO] [stdout] | | ---- first mutable borrow occurs here [INFO] [stdout] 79 | | Node(NodeData { value, .. }) if *t == *value => self, [INFO] [stdout] | | ^^^^ second mutable borrow occurs here [INFO] [stdout] 80 | | Node(NodeData { value, right, .. }) if *value < *t => right.find_mut(t), [INFO] [stdout] 81 | | Node(_) => unreachable!(), [INFO] [stdout] 82 | | } [INFO] [stdout] | |_________- returning this value requires that `self.0.left` is borrowed for `'1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bst/bst.rs:146:21 [INFO] [stdout] | [INFO] [stdout] 146 | let mut prev_node = left.find_max_mut(); [INFO] [stdout] | ----^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error; 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0499`. [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bst/bst.rs:146:21 [INFO] [stdout] | [INFO] [stdout] 146 | let mut prev_node = left.find_max_mut(); [INFO] [stdout] | ----^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error; 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0499`. [INFO] [stdout] [INFO] [stderr] error: could not compile `rust_learning` [INFO] [stderr] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] error: build failed [INFO] running `Command { std: "docker" "inspect" "3685e8bd3d390486d030135993770853687693e674482ce06752bc3771221332", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3685e8bd3d390486d030135993770853687693e674482ce06752bc3771221332", kill_on_drop: false }` [INFO] [stdout] 3685e8bd3d390486d030135993770853687693e674482ce06752bc3771221332