[INFO] cloning repository https://github.com/MubasherFiaz/learn_git2
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MubasherFiaz/learn_git2" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMubasherFiaz%2Flearn_git2", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMubasherFiaz%2Flearn_git2'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 560061b66032f0ac27a829790e583828b5505d95
[INFO] testing MubasherFiaz/learn_git2 against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMubasherFiaz%2Flearn_git2" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/MubasherFiaz/learn_git2
[INFO] finished tweaking git repo https://github.com/MubasherFiaz/learn_git2
[INFO] tweaked toml for git repo https://github.com/MubasherFiaz/learn_git2 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/MubasherFiaz/learn_git2 on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/MubasherFiaz/learn_git2 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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] afe67367326de40696c928966dbdc51940f28c41ccb7a2a63f8fe27c4a06cb91
[INFO] running `Command { std: "docker" "start" "-a" "afe67367326de40696c928966dbdc51940f28c41ccb7a2a63f8fe27c4a06cb91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "afe67367326de40696c928966dbdc51940f28c41ccb7a2a63f8fe27c4a06cb91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "afe67367326de40696c928966dbdc51940f28c41ccb7a2a63f8fe27c4a06cb91", kill_on_drop: false }`
[INFO] [stdout] afe67367326de40696c928966dbdc51940f28c41ccb7a2a63f8fe27c4a06cb91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=forbid" "-e" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c720ed7674215a343e74799628c533cbd4a00d0a1bf5b220f8bf926214470299
[INFO] running `Command { std: "docker" "start" "-a" "c720ed7674215a343e74799628c533cbd4a00d0a1bf5b220f8bf926214470299", kill_on_drop: false }`
[INFO] [stderr]    Compiling pre v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/main.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout]   2 | fn main() {
[INFO] [stdout]     |          - expected `()` because of default return type
[INFO] [stdout] ...
[INFO] [stdout] 104 | return &s[0..i];
[INFO] [stdout]     |        ^^^^^^^^ expected `()`, found `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pre` (bin "pre") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "c720ed7674215a343e74799628c533cbd4a00d0a1bf5b220f8bf926214470299", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c720ed7674215a343e74799628c533cbd4a00d0a1bf5b220f8bf926214470299", kill_on_drop: false }`
[INFO] [stdout] c720ed7674215a343e74799628c533cbd4a00d0a1bf5b220f8bf926214470299