[INFO] fetching crate rbtset 1.0.1...
[INFO] checking rbtset-1.0.1 against try#b1cc2963e8346ba1f5afb1edb86dbcf3f9ef0c5f for pr-76104
[INFO] extracting crate rbtset 1.0.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate rbtset 1.0.1 on toolchain b1cc2963e8346ba1f5afb1edb86dbcf3f9ef0c5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b1cc2963e8346ba1f5afb1edb86dbcf3f9ef0c5f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rbtset 1.0.1
[INFO] finished tweaking crates.io crate rbtset 1.0.1
[INFO] tweaked toml for crates.io crate rbtset 1.0.1 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b1cc2963e8346ba1f5afb1edb86dbcf3f9ef0c5f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b1cc2963e8346ba1f5afb1edb86dbcf3f9ef0c5f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+b1cc2963e8346ba1f5afb1edb86dbcf3f9ef0c5f" "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] 643cd9a7164af4c8960a0af107566fffda6c24f7504d45238725a96ef4002d3b
[INFO] running `Command { std: "docker" "start" "-a" "643cd9a7164af4c8960a0af107566fffda6c24f7504d45238725a96ef4002d3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "643cd9a7164af4c8960a0af107566fffda6c24f7504d45238725a96ef4002d3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "643cd9a7164af4c8960a0af107566fffda6c24f7504d45238725a96ef4002d3b", kill_on_drop: false }`
[INFO] [stdout] 643cd9a7164af4c8960a0af107566fffda6c24f7504d45238725a96ef4002d3b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+b1cc2963e8346ba1f5afb1edb86dbcf3f9ef0c5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6fdde5240d02a91b444c078801198b8cdc0bedc9ea365d3e4da8dd840946b7dc
[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" "6fdde5240d02a91b444c078801198b8cdc0bedc9ea365d3e4da8dd840946b7dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking rbtset v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stdout] error: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/tree.rs:237:13
[INFO] [stdout]     |
[INFO] [stdout] 236 |         let node = if let Some(ref root) = self.root {
[INFO] [stdout]     |                                -------- immutable borrow occurs here
[INFO] [stdout] 237 |             self.insert_from(root.duplicate(), data)
[INFO] [stdout]     |             ^^^^             ---- immutable borrow later used here
[INFO] [stdout]     |             |
[INFO] [stdout]     |             mutable borrow occurs here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(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] [stderr]     Checking rand_core v0.3.1
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rbtset`
[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" "6fdde5240d02a91b444c078801198b8cdc0bedc9ea365d3e4da8dd840946b7dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fdde5240d02a91b444c078801198b8cdc0bedc9ea365d3e4da8dd840946b7dc", kill_on_drop: false }`
[INFO] [stdout] 6fdde5240d02a91b444c078801198b8cdc0bedc9ea365d3e4da8dd840946b7dc