Dec 19 20:51:10.264 INFO checking akuraj/learn_rust against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 20:51:10.264 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/akuraj/learn_rust:/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 20:51:10.739 INFO [stdout] 8bdd278095b517ebd964def9b0edd9bb06c2ebacb0bea685cc419ac4135617fc
Dec 19 20:51:10.741 INFO running `"docker" "start" "-a" "8bdd278095b517ebd964def9b0edd9bb06c2ebacb0bea685cc419ac4135617fc"`
Dec 19 20:51:12.478 INFO [stderr]     Checking learn_rust v0.1.0 (/opt/crater/workdir)
Dec 19 20:51:12.950 INFO [stderr] warning: unused variable: `x`
Dec 19 20:51:12.950 INFO [stderr]  --> src/test_lifetimes.rs:1:34
Dec 19 20:51:12.951 INFO [stderr]   |
Dec 19 20:51:12.951 INFO [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
Dec 19 20:51:12.951 INFO [stderr]   |                                  ^ help: consider using `_x` instead
Dec 19 20:51:12.952 INFO [stderr]   |
Dec 19 20:51:12.952 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 20:51:12.952 INFO [stderr] 
Dec 19 20:51:12.953 INFO [stderr] warning: unused variable: `z`
Dec 19 20:51:12.953 INFO [stderr]  --> src/test_lifetimes.rs:1:58
Dec 19 20:51:12.953 INFO [stderr]   |
Dec 19 20:51:12.957 INFO [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
Dec 19 20:51:12.958 INFO [stderr]   |                                                          ^ help: consider using `_z` instead
Dec 19 20:51:12.958 INFO [stderr] 
Dec 19 20:51:12.958 INFO [stderr] warning: variable `a` is assigned to, but never used
Dec 19 20:51:12.959 INFO [stderr]  --> src/test_lifetimes.rs:9:9
Dec 19 20:51:12.959 INFO [stderr]   |
Dec 19 20:51:12.959 INFO [stderr] 9 |     let a: &u32;
Dec 19 20:51:12.960 INFO [stderr]   |         ^
Dec 19 20:51:12.960 INFO [stderr]   |
Dec 19 20:51:12.960 INFO [stderr]   = note: consider using `_a` instead
Dec 19 20:51:12.960 INFO [stderr] 
Dec 19 20:51:12.961 INFO [stderr] warning: value assigned to `a` is never read
Dec 19 20:51:12.961 INFO [stderr]   --> src/test_lifetimes.rs:15:9
Dec 19 20:51:12.961 INFO [stderr]    |
Dec 19 20:51:12.961 INFO [stderr] 15 |         a = {
Dec 19 20:51:12.962 INFO [stderr]    |         ^
Dec 19 20:51:12.962 INFO [stderr]    |
Dec 19 20:51:12.962 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 20:51:12.962 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 20:51:12.963 INFO [stderr] 
Dec 19 20:51:13.013 INFO [stderr] warning: unused variable: `x`
Dec 19 20:51:13.013 INFO [stderr]  --> src/test_lifetimes.rs:1:34
Dec 19 20:51:13.014 INFO [stderr]   |
Dec 19 20:51:13.014 INFO [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
Dec 19 20:51:13.014 INFO [stderr]   |                                  ^ help: consider using `_x` instead
Dec 19 20:51:13.014 INFO [stderr]   |
Dec 19 20:51:13.014 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 20:51:13.014 INFO [stderr] 
Dec 19 20:51:13.014 INFO [stderr] warning: unused variable: `z`
Dec 19 20:51:13.014 INFO [stderr]  --> src/test_lifetimes.rs:1:58
Dec 19 20:51:13.014 INFO [stderr]   |
Dec 19 20:51:13.014 INFO [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
Dec 19 20:51:13.014 INFO [stderr]   |                                                          ^ help: consider using `_z` instead
Dec 19 20:51:13.014 INFO [stderr] 
Dec 19 20:51:13.014 INFO [stderr] warning: variable `a` is assigned to, but never used
Dec 19 20:51:13.014 INFO [stderr]  --> src/test_lifetimes.rs:9:9
Dec 19 20:51:13.014 INFO [stderr]   |
Dec 19 20:51:13.014 INFO [stderr] 9 |     let a: &u32;
Dec 19 20:51:13.014 INFO [stderr]   |         ^
Dec 19 20:51:13.014 INFO [stderr]   |
Dec 19 20:51:13.014 INFO [stderr]   = note: consider using `_a` instead
Dec 19 20:51:13.014 INFO [stderr] 
Dec 19 20:51:13.015 INFO [stderr] warning: value assigned to `a` is never read
Dec 19 20:51:13.015 INFO [stderr]   --> src/test_lifetimes.rs:15:9
Dec 19 20:51:13.015 INFO [stderr]    |
Dec 19 20:51:13.015 INFO [stderr] 15 |         a = {
Dec 19 20:51:13.015 INFO [stderr]    |         ^
Dec 19 20:51:13.015 INFO [stderr]    |
Dec 19 20:51:13.015 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 20:51:13.015 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 20:51:13.015 INFO [stderr] 
Dec 19 20:51:13.072 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.64s
Dec 19 20:51:14.296 INFO running `"docker" "inspect" "8bdd278095b517ebd964def9b0edd9bb06c2ebacb0bea685cc419ac4135617fc"`
Dec 19 20:51:14.556 INFO running `"docker" "rm" "-f" "8bdd278095b517ebd964def9b0edd9bb06c2ebacb0bea685cc419ac4135617fc"`
Dec 19 20:51:14.804 INFO [stdout] 8bdd278095b517ebd964def9b0edd9bb06c2ebacb0bea685cc419ac4135617fc