[INFO] cloning repository https://github.com/amitdash291/rust_lifetimes [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/amitdash291/rust_lifetimes" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famitdash291%2Frust_lifetimes", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famitdash291%2Frust_lifetimes'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 1de31b9f2321d84ba42e1c3319e2142917794fe9 [INFO] checking amitdash291/rust_lifetimes against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famitdash291%2Frust_lifetimes" "/workspace/builds/worker-3/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/amitdash291/rust_lifetimes 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/amitdash291/rust_lifetimes [INFO] finished tweaking git repo https://github.com/amitdash291/rust_lifetimes [INFO] tweaked toml for git repo https://github.com/amitdash291/rust_lifetimes written to /workspace/builds/worker-3/source/Cargo.toml [INFO] crate git repo https://github.com/amitdash291/rust_lifetimes 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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 3c08eb4f937f7ea02393328005a2319d49f963b68f9c2d08d20af2aef8fee8d6 [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" "3c08eb4f937f7ea02393328005a2319d49f963b68f9c2d08d20af2aef8fee8d6", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "3c08eb4f937f7ea02393328005a2319d49f963b68f9c2d08d20af2aef8fee8d6", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3c08eb4f937f7ea02393328005a2319d49f963b68f9c2d08d20af2aef8fee8d6", kill_on_drop: false }` [INFO] [stdout] 3c08eb4f937f7ea02393328005a2319d49f963b68f9c2d08d20af2aef8fee8d6 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 79f6b96db8cf4730f69179cb095c20c6b712cfaa0e7663c8094761214e502723 [INFO] running `Command { std: "docker" "start" "-a" "79f6b96db8cf4730f69179cb095c20c6b712cfaa0e7663c8094761214e502723", kill_on_drop: false }` [INFO] [stderr] Checking lifetime_demo v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: variable `result_ref` is assigned to, but never used [INFO] [stdout] --> src/main.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | let result_ref; [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] = note: consider using `_result_ref` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `result_ref` is never read [INFO] [stdout] --> src/main.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | result_ref = which_is_greater(&a, &b) [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: `a` [INFO] [stdout] --> src/main.rs:25:29 [INFO] [stdout] | [INFO] [stdout] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b` [INFO] [stdout] --> src/main.rs:25:41 [INFO] [stdout] | [INFO] [stdout] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `vec1` [INFO] [stdout] --> src/main.rs:37:13 [INFO] [stdout] | [INFO] [stdout] 37 | let mut vec1: Vec = Vec::new(); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_vec1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:37:9 [INFO] [stdout] | [INFO] [stdout] 37 | let mut vec1: Vec = Vec::new(); [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `test_mut_ref` [INFO] [stdout] --> src/main.rs:34:4 [INFO] [stdout] | [INFO] [stdout] 34 | fn test_mut_ref() { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `copy_vec` [INFO] [stdout] --> src/main.rs:40:4 [INFO] [stdout] | [INFO] [stdout] 40 | fn copy_vec(from: &Vec, to: &mut Vec) { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `result_ref` is assigned to, but never used [INFO] [stdout] --> src/main.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | let result_ref; [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] = note: consider using `_result_ref` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `result_ref` is never read [INFO] [stdout] --> src/main.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | result_ref = which_is_greater(&a, &b) [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: `a` [INFO] [stdout] --> src/main.rs:25:29 [INFO] [stdout] | [INFO] [stdout] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b` [INFO] [stdout] --> src/main.rs:25:41 [INFO] [stdout] | [INFO] [stdout] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `vec1` [INFO] [stdout] --> src/main.rs:37:13 [INFO] [stdout] | [INFO] [stdout] 37 | let mut vec1: Vec = Vec::new(); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_vec1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:37:9 [INFO] [stdout] | [INFO] [stdout] 37 | let mut vec1: Vec = Vec::new(); [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `test_mut_ref` [INFO] [stdout] --> src/main.rs:34:4 [INFO] [stdout] | [INFO] [stdout] 34 | fn test_mut_ref() { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `copy_vec` [INFO] [stdout] --> src/main.rs:40:4 [INFO] [stdout] | [INFO] [stdout] 40 | fn copy_vec(from: &Vec, to: &mut Vec) { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.33s [INFO] running `Command { std: "docker" "inspect" "79f6b96db8cf4730f69179cb095c20c6b712cfaa0e7663c8094761214e502723", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "79f6b96db8cf4730f69179cb095c20c6b712cfaa0e7663c8094761214e502723", kill_on_drop: false }` [INFO] [stdout] 79f6b96db8cf4730f69179cb095c20c6b712cfaa0e7663c8094761214e502723