[INFO] updating cached repository Takamichi-tsutsumi/monkey-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Takamichi-tsutsumi/monkey-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Takamichi-tsutsumi/monkey-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/Takamichi-tsutsumi/monkey-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Takamichi-tsutsumi/monkey-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Takamichi-tsutsumi/monkey-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Takamichi-tsutsumi/monkey-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Takamichi-tsutsumi/monkey-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8e463a22618dca1dd8de1cbe4eaf50d6d62bde58
[INFO] sha for GitHub repo Takamichi-tsutsumi/monkey-rust: 8e463a22618dca1dd8de1cbe4eaf50d6d62bde58
[INFO] validating manifest of Takamichi-tsutsumi/monkey-rust on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Takamichi-tsutsumi/monkey-rust on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Takamichi-tsutsumi/monkey-rust
[INFO] finished frobbing Takamichi-tsutsumi/monkey-rust
[INFO] frobbed toml for Takamichi-tsutsumi/monkey-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/Takamichi-tsutsumi/monkey-rust/Cargo.toml
[INFO] started frobbing Takamichi-tsutsumi/monkey-rust
[INFO] finished frobbing Takamichi-tsutsumi/monkey-rust
[INFO] frobbed toml for Takamichi-tsutsumi/monkey-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Takamichi-tsutsumi/monkey-rust/Cargo.toml
[INFO] crate Takamichi-tsutsumi/monkey-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Takamichi-tsutsumi/monkey-rust against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Takamichi-tsutsumi/monkey-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 2250e75d2d7818ba1fbd658ffc90eb726bf2e88091ff648d6ffe97a2b672f288
[INFO] running `"docker" "start" "-a" "2250e75d2d7818ba1fbd658ffc90eb726bf2e88091ff648d6ffe97a2b672f288"`
[INFO] [stderr]    Compiling monkey v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0277]: the type `std::string::String` cannot be indexed by `usize`
[INFO] [stderr]   --> lib/lexer.rs:24:24
[INFO] [stderr]    |
[INFO] [stderr] 24 |             self.chr = self.input[self.read_position];
[INFO] [stderr]    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `std::string::String` cannot be indexed by `usize`
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::ops::Index<usize>` is not implemented for `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `monkey`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2250e75d2d7818ba1fbd658ffc90eb726bf2e88091ff648d6ffe97a2b672f288"`
[INFO] running `"docker" "rm" "-f" "2250e75d2d7818ba1fbd658ffc90eb726bf2e88091ff648d6ffe97a2b672f288"`
[INFO] [stdout] 2250e75d2d7818ba1fbd658ffc90eb726bf2e88091ff648d6ffe97a2b672f288