[INFO] cloning repository https://github.com/Takamichi-tsutsumi/monkey-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Takamichi-tsutsumi/monkey-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTakamichi-tsutsumi%2Fmonkey-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTakamichi-tsutsumi%2Fmonkey-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8e463a22618dca1dd8de1cbe4eaf50d6d62bde58
[INFO] checking Takamichi-tsutsumi/monkey-rust against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTakamichi-tsutsumi%2Fmonkey-rust" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Takamichi-tsutsumi/monkey-rust on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Takamichi-tsutsumi/monkey-rust
[INFO] finished tweaking git repo https://github.com/Takamichi-tsutsumi/monkey-rust
[INFO] tweaked toml for git repo https://github.com/Takamichi-tsutsumi/monkey-rust written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/Takamichi-tsutsumi/monkey-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 95331bfdba58a8d75c4a7bb4a52dac29dd367746cec2c3e3c9e16a406be4d508
[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" "95331bfdba58a8d75c4a7bb4a52dac29dd367746cec2c3e3c9e16a406be4d508", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "95331bfdba58a8d75c4a7bb4a52dac29dd367746cec2c3e3c9e16a406be4d508", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95331bfdba58a8d75c4a7bb4a52dac29dd367746cec2c3e3c9e16a406be4d508", kill_on_drop: false }`
[INFO] [stdout] 95331bfdba58a8d75c4a7bb4a52dac29dd367746cec2c3e3c9e16a406be4d508
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3528b32e08eef34936af80e06818c088c3ac8348d87b0c9b6d8096c5283bf090
[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" "3528b32e08eef34936af80e06818c088c3ac8348d87b0c9b6d8096c5283bf090", kill_on_drop: false }`
[INFO] [stderr]     Checking monkey v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the type `String` cannot be indexed by `usize`
[INFO] [stdout]   --> lib/lexer.rs:24:24
[INFO] [stdout]    |
[INFO] [stdout] 24 |             self.chr = self.input[self.read_position];
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `String` cannot be indexed by `usize`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `Index<usize>` is not implemented for `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `monkey`
[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] [stdout] error[E0277]: the type `String` cannot be indexed by `usize`
[INFO] [stdout]   --> lib/lexer.rs:24:24
[INFO] [stdout]    |
[INFO] [stdout] 24 |             self.chr = self.input[self.read_position];
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `String` cannot be indexed by `usize`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `Index<usize>` is not implemented for `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3528b32e08eef34936af80e06818c088c3ac8348d87b0c9b6d8096c5283bf090", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3528b32e08eef34936af80e06818c088c3ac8348d87b0c9b6d8096c5283bf090", kill_on_drop: false }`
[INFO] [stdout] 3528b32e08eef34936af80e06818c088c3ac8348d87b0c9b6d8096c5283bf090