[INFO] cloning repository https://github.com/rfrazier716/rust_101
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rfrazier716/rust_101" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frfrazier716%2Frust_101", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frfrazier716%2Frust_101'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eaba1c314ea9247d1d683ca2d0d6b64b6b0714eb
[INFO] checking rfrazier716/rust_101 against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frfrazier716%2Frust_101" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rfrazier716/rust_101 on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rfrazier716/rust_101
[INFO] finished tweaking git repo https://github.com/rfrazier716/rust_101
[INFO] tweaked toml for git repo https://github.com/rfrazier716/rust_101 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rfrazier716/rust_101 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b58ac3a8a29f8bb639d3d329f6f122256ec0e1318c1e8901fd1e7031edd66a30
[INFO] running `Command { std: "docker" "start" "-a" "b58ac3a8a29f8bb639d3d329f6f122256ec0e1318c1e8901fd1e7031edd66a30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b58ac3a8a29f8bb639d3d329f6f122256ec0e1318c1e8901fd1e7031edd66a30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b58ac3a8a29f8bb639d3d329f6f122256ec0e1318c1e8901fd1e7031edd66a30", kill_on_drop: false }`
[INFO] [stdout] b58ac3a8a29f8bb639d3d329f6f122256ec0e1318c1e8901fd1e7031edd66a30
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dbdff2343eb77a5336f1f20007c4039b74ec12d0aba4eba06ec11217e15df903
[INFO] running `Command { std: "docker" "start" "-a" "dbdff2343eb77a5336f1f20007c4039b74ec12d0aba4eba06ec11217e15df903", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking rectangles v0.1.0 (/opt/rustwide/workdir/rectangles)
[INFO] [stderr]     Checking variables v0.1.0 (/opt/rustwide/workdir/variables)
[INFO] [stdout] error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> variables/src/main.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let test = bad_substring(&s, 2);
[INFO] [stdout]    |                              -- immutable borrow occurs here
[INFO] [stdout] 20 |     append(&mut s, &to_append);
[INFO] [stdout]    |            ^^^^^^ mutable borrow occurs here
[INFO] [stdout] 21 |     println!("{test}");
[INFO] [stdout]    |               ------ immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> variables/src/main.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let test = bad_substring(&s, 2);
[INFO] [stdout]    |                              -- immutable borrow occurs here
[INFO] [stdout] 20 |     append(&mut s, &to_append);
[INFO] [stdout]    |            ^^^^^^ mutable borrow occurs here
[INFO] [stdout] 21 |     println!("{test}");
[INFO] [stdout]    |               ------ immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `variables` (bin "variables" test) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `variables` (bin "variables") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "dbdff2343eb77a5336f1f20007c4039b74ec12d0aba4eba06ec11217e15df903", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbdff2343eb77a5336f1f20007c4039b74ec12d0aba4eba06ec11217e15df903", kill_on_drop: false }`
[INFO] [stdout] dbdff2343eb77a5336f1f20007c4039b74ec12d0aba4eba06ec11217e15df903