[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] 6b94d26fd680e2301f28a46bd7295a9d0589d708 [INFO] checking n4to4/rust-for-rustaceans against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fn4to4%2Frust-for-rustaceans" "/workspace/builds/worker-11/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/n4to4/rust-for-rustaceans on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "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-11/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] d4707fd4523170786eaf9258bc9e7052fe5655b2c09e96bbf6d1cadb5ff5cc32 [INFO] running `Command { std: "docker" "start" "-a" "d4707fd4523170786eaf9258bc9e7052fe5655b2c09e96bbf6d1cadb5ff5cc32", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "d4707fd4523170786eaf9258bc9e7052fe5655b2c09e96bbf6d1cadb5ff5cc32", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d4707fd4523170786eaf9258bc9e7052fe5655b2c09e96bbf6d1cadb5ff5cc32", kill_on_drop: false }` [INFO] [stdout] d4707fd4523170786eaf9258bc9e7052fe5655b2c09e96bbf6d1cadb5ff5cc32 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 68bed836a46562db9c29d1816f2ad3132a8d5fc48bbf60bf13210a20527b1fa4 [INFO] running `Command { std: "docker" "start" "-a" "68bed836a46562db9c29d1816f2ad3132a8d5fc48bbf60bf13210a20527b1fa4", 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] [stderr] Checking chapter04 v0.1.0 (/opt/rustwide/workdir/chapter04) [INFO] [stdout] warning: private trait `TraitBounds` in public interface (error E0445) [INFO] [stdout] --> chapter04/src/main.rs:44:5 [INFO] [stdout] | [INFO] [stdout] 44 | impl Sealed for T where T: TraitBounds {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(private_in_public)]` on by default [INFO] [stdout] = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! [INFO] [stdout] = note: for more information, see issue #34537 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: private trait `TraitBounds` in public interface (error E0445) [INFO] [stdout] --> chapter04/src/main.rs:46:1 [INFO] [stdout] | [INFO] [stdout] 46 | impl CanUseCannotImplement for T where T: TraitBounds {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! [INFO] [stdout] = note: for more information, see issue #34537 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: private trait `TraitBounds` in public interface (error E0445) [INFO] [stdout] --> chapter04/src/main.rs:44:5 [INFO] [stdout] | [INFO] [stdout] 44 | impl Sealed for T where T: TraitBounds {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(private_in_public)]` on by default [INFO] [stdout] = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! [INFO] [stdout] = note: for more information, see issue #34537 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: private trait `TraitBounds` in public interface (error E0445) [INFO] [stdout] --> chapter04/src/main.rs:46:1 [INFO] [stdout] | [INFO] [stdout] 46 | impl CanUseCannotImplement for T where T: TraitBounds {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! [INFO] [stdout] = note: for more information, see issue #34537 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [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` due to 2 previous errors; 7 warnings emitted [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" "68bed836a46562db9c29d1816f2ad3132a8d5fc48bbf60bf13210a20527b1fa4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "68bed836a46562db9c29d1816f2ad3132a8d5fc48bbf60bf13210a20527b1fa4", kill_on_drop: false }` [INFO] [stdout] 68bed836a46562db9c29d1816f2ad3132a8d5fc48bbf60bf13210a20527b1fa4