[INFO] cloning repository https://github.com/n4to4/rust-for-rustaceans [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/n4to4/rust-for-rustaceans" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fn4to4%2Frust-for-rustaceans", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fn4to4%2Frust-for-rustaceans'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 5dec5f606081a8d47a03ea631247d28698fd4478 [INFO] checking n4to4/rust-for-rustaceans against try#8552849d5ae3b6c66b89a0ac2e9c1e3ef5cde346 for pr-86194 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fn4to4%2Frust-for-rustaceans" "/workspace/builds/worker-2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/n4to4/rust-for-rustaceans on toolchain 8552849d5ae3b6c66b89a0ac2e9c1e3ef5cde346 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8552849d5ae3b6c66b89a0ac2e9c1e3ef5cde346" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/n4to4/rust-for-rustaceans [INFO] finished tweaking git repo https://github.com/n4to4/rust-for-rustaceans [INFO] tweaked toml for git repo https://github.com/n4to4/rust-for-rustaceans written to /workspace/builds/worker-2/source/Cargo.toml [INFO] crate git repo https://github.com/n4to4/rust-for-rustaceans already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8552849d5ae3b6c66b89a0ac2e9c1e3ef5cde346" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+8552849d5ae3b6c66b89a0ac2e9c1e3ef5cde346" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 42c5290a47a6e6ec32c9bf6af0ca3ae3ce169ee29f9894da5e5615cdc34e55bb [INFO] running `Command { std: "docker" "start" "-a" "42c5290a47a6e6ec32c9bf6af0ca3ae3ce169ee29f9894da5e5615cdc34e55bb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "42c5290a47a6e6ec32c9bf6af0ca3ae3ce169ee29f9894da5e5615cdc34e55bb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "42c5290a47a6e6ec32c9bf6af0ca3ae3ce169ee29f9894da5e5615cdc34e55bb", kill_on_drop: false }` [INFO] [stdout] 42c5290a47a6e6ec32c9bf6af0ca3ae3ce169ee29f9894da5e5615cdc34e55bb [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+8552849d5ae3b6c66b89a0ac2e9c1e3ef5cde346" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 1cfe7cd80432445c3eb933fd97631fa306dde4c74405d4415a94c27e9458bf9e [INFO] running `Command { std: "docker" "start" "-a" "1cfe7cd80432445c3eb933fd97631fa306dde4c74405d4415a94c27e9458bf9e", kill_on_drop: false }` [INFO] [stderr] Checking rust-for-rustaceans v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Checking chapter03 v0.1.0 (/opt/rustwide/workdir/chapter03) [INFO] [stderr] Checking chapter02 v0.1.0 (/opt/rustwide/workdir/chapter02) [INFO] [stdout] warning: unused variable: `var1` [INFO] [stdout] --> chapter02/src/main.rs:8:9 [INFO] [stdout] | [INFO] [stdout] 8 | let var1 = &x; [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_var1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `var2` is assigned to, but never used [INFO] [stdout] --> chapter02/src/main.rs:9:13 [INFO] [stdout] | [INFO] [stdout] 9 | let mut var2 = &x; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_var2` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `var2` is never read [INFO] [stdout] --> chapter02/src/main.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 10 | var2 = &y; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> chapter02/src/main.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let y = &x; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `x` is never read [INFO] [stdout] --> chapter02/src/main.rs:19:5 [INFO] [stdout] | [INFO] [stdout] 19 | x = 43; [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> chapter02/src/main.rs:27:13 [INFO] [stdout] | [INFO] [stdout] 27 | let z = (x1, y1); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x2` [INFO] [stdout] --> chapter02/src/main.rs:29:9 [INFO] [stdout] | [INFO] [stdout] 29 | let x2 = x1; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_x2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0502]: cannot borrow `s` as immutable because it is also borrowed as mutable [INFO] [stdout] --> chapter02/src/main.rs:74:20 [INFO] [stdout] | [INFO] [stdout] 73 | *MutStr { s: &mut s }.s = "world"; [INFO] [stdout] | ------ mutable borrow occurs here [INFO] [stdout] 74 | println!("{}", s); [INFO] [stdout] | ^ [INFO] [stdout] | | [INFO] [stdout] | immutable borrow occurs here [INFO] [stdout] | mutable borrow later used here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error; 7 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0502`. [INFO] [stdout] [INFO] [stderr] error: could not compile `chapter02` [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] warning: unused variable: `var1` [INFO] [stdout] --> chapter02/src/main.rs:8:9 [INFO] [stdout] | [INFO] [stdout] 8 | let var1 = &x; [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_var1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `var2` is assigned to, but never used [INFO] [stdout] --> chapter02/src/main.rs:9:13 [INFO] [stdout] | [INFO] [stdout] 9 | let mut var2 = &x; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_var2` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `var2` is never read [INFO] [stdout] --> chapter02/src/main.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 10 | var2 = &y; [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> chapter02/src/main.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let y = &x; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `x` is never read [INFO] [stdout] --> chapter02/src/main.rs:19:5 [INFO] [stdout] | [INFO] [stdout] 19 | x = 43; [INFO] [stdout] | ^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> chapter02/src/main.rs:27:13 [INFO] [stdout] | [INFO] [stdout] 27 | let z = (x1, y1); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x2` [INFO] [stdout] --> chapter02/src/main.rs:29:9 [INFO] [stdout] | [INFO] [stdout] 29 | let x2 = x1; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_x2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0502]: cannot borrow `s` as immutable because it is also borrowed as mutable [INFO] [stdout] --> chapter02/src/main.rs:74:20 [INFO] [stdout] | [INFO] [stdout] 73 | *MutStr { s: &mut s }.s = "world"; [INFO] [stdout] | ------ mutable borrow occurs here [INFO] [stdout] 74 | println!("{}", s); [INFO] [stdout] | ^ [INFO] [stdout] | | [INFO] [stdout] | immutable borrow occurs here [INFO] [stdout] | mutable borrow later used here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error; 7 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0502`. [INFO] [stdout] [INFO] [stderr] error: build failed [INFO] running `Command { std: "docker" "inspect" "1cfe7cd80432445c3eb933fd97631fa306dde4c74405d4415a94c27e9458bf9e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1cfe7cd80432445c3eb933fd97631fa306dde4c74405d4415a94c27e9458bf9e", kill_on_drop: false }` [INFO] [stdout] 1cfe7cd80432445c3eb933fd97631fa306dde4c74405d4415a94c27e9458bf9e