[INFO] cloning repository https://github.com/CrimsonAndRed/MyLittleTree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CrimsonAndRed/MyLittleTree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCrimsonAndRed%2FMyLittleTree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCrimsonAndRed%2FMyLittleTree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 78579106ceda8e62514cfb157392a5c603b54fdf
[INFO] checking CrimsonAndRed/MyLittleTree against master#c9228570668803e3e6402770d55f23a12c9ae686 for pr-79472
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCrimsonAndRed%2FMyLittleTree" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CrimsonAndRed/MyLittleTree on toolchain c9228570668803e3e6402770d55f23a12c9ae686
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c9228570668803e3e6402770d55f23a12c9ae686" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CrimsonAndRed/MyLittleTree
[INFO] finished tweaking git repo https://github.com/CrimsonAndRed/MyLittleTree
[INFO] tweaked toml for git repo https://github.com/CrimsonAndRed/MyLittleTree written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/CrimsonAndRed/MyLittleTree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c9228570668803e3e6402770d55f23a12c9ae686" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+c9228570668803e3e6402770d55f23a12c9ae686" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 363caf6203e613c767c39e54c94c16f5bb0e13e58bf5b10d3b0f6cacb1b9586b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "363caf6203e613c767c39e54c94c16f5bb0e13e58bf5b10d3b0f6cacb1b9586b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "363caf6203e613c767c39e54c94c16f5bb0e13e58bf5b10d3b0f6cacb1b9586b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "363caf6203e613c767c39e54c94c16f5bb0e13e58bf5b10d3b0f6cacb1b9586b", kill_on_drop: false }`
[INFO] [stdout] 363caf6203e613c767c39e54c94c16f5bb0e13e58bf5b10d3b0f6cacb1b9586b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+c9228570668803e3e6402770d55f23a12c9ae686" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 73864b91ccc61278149189b35ed67631fda76f78912e6c588b152b9428326e51
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "73864b91ccc61278149189b35ed67631fda76f78912e6c588b152b9428326e51", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking my_little_tree v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/lib.rs:108:27
[INFO] [stdout]     |
[INFO] [stdout] 102 |         match &self.root {
[INFO] [stdout]     |               ---------- immutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 108 |             Some(link) => self.inner_insert(new_node, Rc::clone(&link)),
[INFO] [stdout]     |                           ^^^^ mutable borrow occurs here       ----- immutable borrow later used here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stdout]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stdout]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/lib.rs:108:27
[INFO] [stdout]     |
[INFO] [stdout] 102 |         match &self.root {
[INFO] [stdout]     |               ---------- immutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 108 |             Some(link) => self.inner_insert(new_node, Rc::clone(&link)),
[INFO] [stdout]     |                           ^^^^ mutable borrow occurs here       ----- immutable borrow later used here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stdout]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stdout]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.05s
[INFO] running `Command { std: "docker" "inspect" "73864b91ccc61278149189b35ed67631fda76f78912e6c588b152b9428326e51", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73864b91ccc61278149189b35ed67631fda76f78912e6c588b152b9428326e51", kill_on_drop: false }`
[INFO] [stdout] 73864b91ccc61278149189b35ed67631fda76f78912e6c588b152b9428326e51