Dec 18 04:05:55.286 INFO checking amitdash291/rust_lifetimes against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 04:05:55.286 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-1/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/amitdash291/rust_lifetimes:/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=forbid" "-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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 04:05:55.764 INFO [stdout] 6c22eee38cec7daa02dd2ea2c377b6a67b79760536635350d9ffb79210202d81
Dec 18 04:05:55.768 INFO running `"docker" "start" "-a" "6c22eee38cec7daa02dd2ea2c377b6a67b79760536635350d9ffb79210202d81"`
Dec 18 04:05:57.237 INFO [stderr]     Checking lifetime_demo v0.1.0 (/opt/crater/workdir)
Dec 18 04:05:57.632 INFO [stderr] warning: variable `result_ref` is assigned to, but never used
Dec 18 04:05:57.632 INFO [stderr]  --> src/main.rs:4:9
Dec 18 04:05:57.632 INFO [stderr]   |
Dec 18 04:05:57.632 INFO [stderr] 4 |     let result_ref;
Dec 18 04:05:57.632 INFO [stderr]   |         ^^^^^^^^^^
Dec 18 04:05:57.632 INFO [stderr]   |
Dec 18 04:05:57.632 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 18 04:05:57.632 INFO [stderr]   = note: consider using `_result_ref` instead
Dec 18 04:05:57.633 INFO [stderr] 
Dec 18 04:05:57.633 INFO [stderr] warning: value assigned to `result_ref` is never read
Dec 18 04:05:57.633 INFO [stderr]  --> src/main.rs:6:5
Dec 18 04:05:57.633 INFO [stderr]   |
Dec 18 04:05:57.633 INFO [stderr] 6 |     result_ref = which_is_greater(&a, &b)
Dec 18 04:05:57.633 INFO [stderr]   |     ^^^^^^^^^^
Dec 18 04:05:57.633 INFO [stderr]   |
Dec 18 04:05:57.633 INFO [stderr]   = note: #[warn(unused_assignments)] on by default
Dec 18 04:05:57.633 INFO [stderr] 
Dec 18 04:05:57.633 INFO [stderr] warning: unused variable: `a`
Dec 18 04:05:57.633 INFO [stderr]   --> src/main.rs:25:29
Dec 18 04:05:57.633 INFO [stderr]    |
Dec 18 04:05:57.633 INFO [stderr] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 {
Dec 18 04:05:57.633 INFO [stderr]    |                             ^ help: consider using `_a` instead
Dec 18 04:05:57.633 INFO [stderr] 
Dec 18 04:05:57.633 INFO [stderr] warning: unused variable: `b`
Dec 18 04:05:57.633 INFO [stderr]   --> src/main.rs:25:41
Dec 18 04:05:57.633 INFO [stderr]    |
Dec 18 04:05:57.633 INFO [stderr] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 {
Dec 18 04:05:57.633 INFO [stderr]    |                                         ^ help: consider using `_b` instead
Dec 18 04:05:57.633 INFO [stderr] 
Dec 18 04:05:57.633 INFO [stderr] warning: unused variable: `vec1`
Dec 18 04:05:57.633 INFO [stderr]   --> src/main.rs:37:13
Dec 18 04:05:57.633 INFO [stderr]    |
Dec 18 04:05:57.633 INFO [stderr] 37 |     let mut vec1: Vec<i32> = Vec::new();
Dec 18 04:05:57.633 INFO [stderr]    |             ^^^^ help: consider using `_vec1` instead
Dec 18 04:05:57.633 INFO [stderr] 
Dec 18 04:05:57.634 INFO [stderr] warning: variable does not need to be mutable
Dec 18 04:05:57.634 INFO [stderr]   --> src/main.rs:37:9
Dec 18 04:05:57.634 INFO [stderr]    |
Dec 18 04:05:57.634 INFO [stderr] 37 |     let mut vec1: Vec<i32> = Vec::new();
Dec 18 04:05:57.634 INFO [stderr]    |         ----^^^^
Dec 18 04:05:57.634 INFO [stderr]    |         |
Dec 18 04:05:57.634 INFO [stderr]    |         help: remove this `mut`
Dec 18 04:05:57.634 INFO [stderr]    |
Dec 18 04:05:57.634 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 04:05:57.634 INFO [stderr] 
Dec 18 04:05:57.637 INFO [stderr] warning: function is never used: `test_mut_ref`
Dec 18 04:05:57.637 INFO [stderr]   --> src/main.rs:34:1
Dec 18 04:05:57.637 INFO [stderr]    |
Dec 18 04:05:57.637 INFO [stderr] 34 | fn test_mut_ref() {
Dec 18 04:05:57.637 INFO [stderr]    | ^^^^^^^^^^^^^^^^^
Dec 18 04:05:57.638 INFO [stderr]    |
Dec 18 04:05:57.638 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 18 04:05:57.638 INFO [stderr] 
Dec 18 04:05:57.638 INFO [stderr] warning: function is never used: `copy_vec`
Dec 18 04:05:57.638 INFO [stderr]   --> src/main.rs:40:1
Dec 18 04:05:57.638 INFO [stderr]    |
Dec 18 04:05:57.639 INFO [stderr] 40 | fn copy_vec(from: &Vec<i32>, to: &mut Vec<i32>) {
Dec 18 04:05:57.639 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 04:05:57.639 INFO [stderr] 
Dec 18 04:05:57.764 INFO [stderr] warning: variable `result_ref` is assigned to, but never used
Dec 18 04:05:57.764 INFO [stderr]  --> src/main.rs:4:9
Dec 18 04:05:57.764 INFO [stderr]   |
Dec 18 04:05:57.764 INFO [stderr] 4 |     let result_ref;
Dec 18 04:05:57.764 INFO [stderr]   |         ^^^^^^^^^^
Dec 18 04:05:57.764 INFO [stderr]   |
Dec 18 04:05:57.764 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 18 04:05:57.764 INFO [stderr]   = note: consider using `_result_ref` instead
Dec 18 04:05:57.764 INFO [stderr] 
Dec 18 04:05:57.764 INFO [stderr] warning: value assigned to `result_ref` is never read
Dec 18 04:05:57.764 INFO [stderr]  --> src/main.rs:6:5
Dec 18 04:05:57.764 INFO [stderr]   |
Dec 18 04:05:57.764 INFO [stderr] 6 |     result_ref = which_is_greater(&a, &b)
Dec 18 04:05:57.764 INFO [stderr]   |     ^^^^^^^^^^
Dec 18 04:05:57.764 INFO [stderr]   |
Dec 18 04:05:57.764 INFO [stderr]   = note: #[warn(unused_assignments)] on by default
Dec 18 04:05:57.764 INFO [stderr] 
Dec 18 04:05:57.764 INFO [stderr] warning: unused variable: `a`
Dec 18 04:05:57.764 INFO [stderr]   --> src/main.rs:25:29
Dec 18 04:05:57.764 INFO [stderr]    |
Dec 18 04:05:57.764 INFO [stderr] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 {
Dec 18 04:05:57.764 INFO [stderr]    |                             ^ help: consider using `_a` instead
Dec 18 04:05:57.764 INFO [stderr] 
Dec 18 04:05:57.768 INFO [stderr] warning: unused variable: `b`
Dec 18 04:05:57.768 INFO [stderr]   --> src/main.rs:25:41
Dec 18 04:05:57.768 INFO [stderr]    |
Dec 18 04:05:57.768 INFO [stderr] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 {
Dec 18 04:05:57.768 INFO [stderr]    |                                         ^ help: consider using `_b` instead
Dec 18 04:05:57.768 INFO [stderr] 
Dec 18 04:05:57.768 INFO [stderr] warning: unused variable: `vec1`
Dec 18 04:05:57.768 INFO [stderr]   --> src/main.rs:37:13
Dec 18 04:05:57.768 INFO [stderr]    |
Dec 18 04:05:57.768 INFO [stderr] 37 |     let mut vec1: Vec<i32> = Vec::new();
Dec 18 04:05:57.768 INFO [stderr]    |             ^^^^ help: consider using `_vec1` instead
Dec 18 04:05:57.768 INFO [stderr] 
Dec 18 04:05:57.768 INFO [stderr] warning: variable does not need to be mutable
Dec 18 04:05:57.768 INFO [stderr]   --> src/main.rs:37:9
Dec 18 04:05:57.768 INFO [stderr]    |
Dec 18 04:05:57.768 INFO [stderr] 37 |     let mut vec1: Vec<i32> = Vec::new();
Dec 18 04:05:57.768 INFO [stderr]    |         ----^^^^
Dec 18 04:05:57.768 INFO [stderr]    |         |
Dec 18 04:05:57.772 INFO [stderr]    |         help: remove this `mut`
Dec 18 04:05:57.772 INFO [stderr]    |
Dec 18 04:05:57.772 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 04:05:57.772 INFO [stderr] 
Dec 18 04:05:57.784 INFO [stderr] warning: function is never used: `test_mut_ref`
Dec 18 04:05:57.784 INFO [stderr]   --> src/main.rs:34:1
Dec 18 04:05:57.784 INFO [stderr]    |
Dec 18 04:05:57.784 INFO [stderr] 34 | fn test_mut_ref() {
Dec 18 04:05:57.784 INFO [stderr]    | ^^^^^^^^^^^^^^^^^
Dec 18 04:05:57.784 INFO [stderr]    |
Dec 18 04:05:57.784 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 18 04:05:57.784 INFO [stderr] 
Dec 18 04:05:57.784 INFO [stderr] warning: function is never used: `copy_vec`
Dec 18 04:05:57.784 INFO [stderr]   --> src/main.rs:40:1
Dec 18 04:05:57.784 INFO [stderr]    |
Dec 18 04:05:57.784 INFO [stderr] 40 | fn copy_vec(from: &Vec<i32>, to: &mut Vec<i32>) {
Dec 18 04:05:57.784 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 04:05:57.784 INFO [stderr] 
Dec 18 04:05:57.832 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.61s
Dec 18 04:05:58.698 INFO running `"docker" "inspect" "6c22eee38cec7daa02dd2ea2c377b6a67b79760536635350d9ffb79210202d81"`
Dec 18 04:05:59.072 INFO running `"docker" "rm" "-f" "6c22eee38cec7daa02dd2ea2c377b6a67b79760536635350d9ffb79210202d81"`
Dec 18 04:05:59.448 INFO [stdout] 6c22eee38cec7daa02dd2ea2c377b6a67b79760536635350d9ffb79210202d81