Dec 19 20:34:39.611 INFO checking amitdash291/rust_lifetimes against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 20:34:39.612 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-0/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 20:34:40.031 INFO [stdout] 5d0c6f3ec916d791017b68526971ec183385fb4f0fd953a0649fac18c95e1946
Dec 19 20:34:40.036 INFO running `"docker" "start" "-a" "5d0c6f3ec916d791017b68526971ec183385fb4f0fd953a0649fac18c95e1946"`
Dec 19 20:34:41.436 INFO [stderr]     Checking lifetime_demo v0.1.0 (/opt/crater/workdir)
Dec 19 20:34:41.809 INFO [stderr] warning: variable `result_ref` is assigned to, but never used
Dec 19 20:34:41.809 INFO [stderr]  --> src/main.rs:4:9
Dec 19 20:34:41.809 INFO [stderr]   |
Dec 19 20:34:41.809 INFO [stderr] 4 |     let result_ref;
Dec 19 20:34:41.809 INFO [stderr]   |         ^^^^^^^^^^
Dec 19 20:34:41.809 INFO [stderr]   |
Dec 19 20:34:41.809 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 20:34:41.809 INFO [stderr]   = note: consider using `_result_ref` instead
Dec 19 20:34:41.809 INFO [stderr] 
Dec 19 20:34:41.809 INFO [stderr] warning: value assigned to `result_ref` is never read
Dec 19 20:34:41.809 INFO [stderr]  --> src/main.rs:6:5
Dec 19 20:34:41.809 INFO [stderr]   |
Dec 19 20:34:41.809 INFO [stderr] 6 |     result_ref = which_is_greater(&a, &b)
Dec 19 20:34:41.809 INFO [stderr]   |     ^^^^^^^^^^
Dec 19 20:34:41.809 INFO [stderr]   |
Dec 19 20:34:41.809 INFO [stderr]   = note: #[warn(unused_assignments)] on by default
Dec 19 20:34:41.809 INFO [stderr]   = help: maybe it is overwritten before being read?
Dec 19 20:34:41.809 INFO [stderr] 
Dec 19 20:34:41.809 INFO [stderr] warning: unused variable: `a`
Dec 19 20:34:41.809 INFO [stderr]   --> src/main.rs:25:29
Dec 19 20:34:41.809 INFO [stderr]    |
Dec 19 20:34:41.809 INFO [stderr] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 {
Dec 19 20:34:41.809 INFO [stderr]    |                             ^ help: consider using `_a` instead
Dec 19 20:34:41.809 INFO [stderr] 
Dec 19 20:34:41.809 INFO [stderr] warning: unused variable: `b`
Dec 19 20:34:41.809 INFO [stderr]   --> src/main.rs:25:41
Dec 19 20:34:41.809 INFO [stderr]    |
Dec 19 20:34:41.809 INFO [stderr] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 {
Dec 19 20:34:41.809 INFO [stderr]    |                                         ^ help: consider using `_b` instead
Dec 19 20:34:41.809 INFO [stderr] 
Dec 19 20:34:41.809 INFO [stderr] warning: unused variable: `vec1`
Dec 19 20:34:41.809 INFO [stderr]   --> src/main.rs:37:13
Dec 19 20:34:41.809 INFO [stderr]    |
Dec 19 20:34:41.809 INFO [stderr] 37 |     let mut vec1: Vec<i32> = Vec::new();
Dec 19 20:34:41.809 INFO [stderr]    |             ^^^^ help: consider using `_vec1` instead
Dec 19 20:34:41.809 INFO [stderr] 
Dec 19 20:34:41.809 INFO [stderr] warning: variable does not need to be mutable
Dec 19 20:34:41.809 INFO [stderr]   --> src/main.rs:37:9
Dec 19 20:34:41.809 INFO [stderr]    |
Dec 19 20:34:41.809 INFO [stderr] 37 |     let mut vec1: Vec<i32> = Vec::new();
Dec 19 20:34:41.809 INFO [stderr]    |         ----^^^^
Dec 19 20:34:41.809 INFO [stderr]    |         |
Dec 19 20:34:41.809 INFO [stderr]    |         help: remove this `mut`
Dec 19 20:34:41.809 INFO [stderr]    |
Dec 19 20:34:41.809 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 20:34:41.809 INFO [stderr] 
Dec 19 20:34:41.820 INFO [stderr] warning: function is never used: `test_mut_ref`
Dec 19 20:34:41.820 INFO [stderr]   --> src/main.rs:34:1
Dec 19 20:34:41.820 INFO [stderr]    |
Dec 19 20:34:41.820 INFO [stderr] 34 | fn test_mut_ref() {
Dec 19 20:34:41.820 INFO [stderr]    | ^^^^^^^^^^^^^^^^^
Dec 19 20:34:41.820 INFO [stderr]    |
Dec 19 20:34:41.820 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 19 20:34:41.820 INFO [stderr] 
Dec 19 20:34:41.820 INFO [stderr] warning: function is never used: `copy_vec`
Dec 19 20:34:41.820 INFO [stderr]   --> src/main.rs:40:1
Dec 19 20:34:41.820 INFO [stderr]    |
Dec 19 20:34:41.820 INFO [stderr] 40 | fn copy_vec(from: &Vec<i32>, to: &mut Vec<i32>) {
Dec 19 20:34:41.820 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 20:34:41.820 INFO [stderr] 
Dec 19 20:34:41.876 INFO [stderr] warning: variable `result_ref` is assigned to, but never used
Dec 19 20:34:41.876 INFO [stderr]  --> src/main.rs:4:9
Dec 19 20:34:41.876 INFO [stderr]   |
Dec 19 20:34:41.876 INFO [stderr] 4 |     let result_ref;
Dec 19 20:34:41.876 INFO [stderr]   |         ^^^^^^^^^^
Dec 19 20:34:41.876 INFO [stderr]   |
Dec 19 20:34:41.876 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 20:34:41.876 INFO [stderr]   = note: consider using `_result_ref` instead
Dec 19 20:34:41.876 INFO [stderr] 
Dec 19 20:34:41.876 INFO [stderr] warning: value assigned to `result_ref` is never read
Dec 19 20:34:41.876 INFO [stderr]  --> src/main.rs:6:5
Dec 19 20:34:41.876 INFO [stderr]   |
Dec 19 20:34:41.876 INFO [stderr] 6 |     result_ref = which_is_greater(&a, &b)
Dec 19 20:34:41.876 INFO [stderr]   |     ^^^^^^^^^^
Dec 19 20:34:41.876 INFO [stderr]   |
Dec 19 20:34:41.876 INFO [stderr]   = note: #[warn(unused_assignments)] on by default
Dec 19 20:34:41.877 INFO [stderr]   = help: maybe it is overwritten before being read?
Dec 19 20:34:41.877 INFO [stderr] 
Dec 19 20:34:41.877 INFO [stderr] warning: unused variable: `a`
Dec 19 20:34:41.877 INFO [stderr]   --> src/main.rs:25:29
Dec 19 20:34:41.877 INFO [stderr]    |
Dec 19 20:34:41.877 INFO [stderr] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 {
Dec 19 20:34:41.877 INFO [stderr]    |                             ^ help: consider using `_a` instead
Dec 19 20:34:41.877 INFO [stderr] 
Dec 19 20:34:41.877 INFO [stderr] warning: unused variable: `b`
Dec 19 20:34:41.877 INFO [stderr]   --> src/main.rs:25:41
Dec 19 20:34:41.877 INFO [stderr]    |
Dec 19 20:34:41.877 INFO [stderr] 25 | fn which_is_greater<'a, 'b>(a: &'a i32, b: &'b i32) -> &'b i32 {
Dec 19 20:34:41.877 INFO [stderr]    |                                         ^ help: consider using `_b` instead
Dec 19 20:34:41.877 INFO [stderr] 
Dec 19 20:34:41.877 INFO [stderr] warning: unused variable: `vec1`
Dec 19 20:34:41.877 INFO [stderr]   --> src/main.rs:37:13
Dec 19 20:34:41.877 INFO [stderr]    |
Dec 19 20:34:41.877 INFO [stderr] 37 |     let mut vec1: Vec<i32> = Vec::new();
Dec 19 20:34:41.877 INFO [stderr]    |             ^^^^ help: consider using `_vec1` instead
Dec 19 20:34:41.877 INFO [stderr] 
Dec 19 20:34:41.880 INFO [stderr] warning: variable does not need to be mutable
Dec 19 20:34:41.880 INFO [stderr]   --> src/main.rs:37:9
Dec 19 20:34:41.880 INFO [stderr]    |
Dec 19 20:34:41.880 INFO [stderr] 37 |     let mut vec1: Vec<i32> = Vec::new();
Dec 19 20:34:41.880 INFO [stderr]    |         ----^^^^
Dec 19 20:34:41.880 INFO [stderr]    |         |
Dec 19 20:34:41.880 INFO [stderr]    |         help: remove this `mut`
Dec 19 20:34:41.880 INFO [stderr]    |
Dec 19 20:34:41.880 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 20:34:41.880 INFO [stderr] 
Dec 19 20:34:41.882 INFO [stderr] warning: function is never used: `test_mut_ref`
Dec 19 20:34:41.882 INFO [stderr]   --> src/main.rs:34:1
Dec 19 20:34:41.882 INFO [stderr]    |
Dec 19 20:34:41.882 INFO [stderr] 34 | fn test_mut_ref() {
Dec 19 20:34:41.882 INFO [stderr]    | ^^^^^^^^^^^^^^^^^
Dec 19 20:34:41.882 INFO [stderr]    |
Dec 19 20:34:41.882 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 19 20:34:41.882 INFO [stderr] 
Dec 19 20:34:41.882 INFO [stderr] warning: function is never used: `copy_vec`
Dec 19 20:34:41.882 INFO [stderr]   --> src/main.rs:40:1
Dec 19 20:34:41.882 INFO [stderr]    |
Dec 19 20:34:41.882 INFO [stderr] 40 | fn copy_vec(from: &Vec<i32>, to: &mut Vec<i32>) {
Dec 19 20:34:41.882 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 20:34:41.882 INFO [stderr] 
Dec 19 20:34:41.929 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.52s
Dec 19 20:34:45.594 INFO running `"docker" "inspect" "5d0c6f3ec916d791017b68526971ec183385fb4f0fd953a0649fac18c95e1946"`
Dec 19 20:34:45.882 INFO running `"docker" "rm" "-f" "5d0c6f3ec916d791017b68526971ec183385fb4f0fd953a0649fac18c95e1946"`
Dec 19 20:34:46.240 INFO [stdout] 5d0c6f3ec916d791017b68526971ec183385fb4f0fd953a0649fac18c95e1946