Dec 11 23:01:39.916 INFO checking akuraj/learn_rust against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 23:01:39.917 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-0/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 11 23:01:40.361 INFO [stdout] bd69b702131882e5cca83f2b53e9d6825c95ad51640334f2f5d84bb813814464
Dec 11 23:01:40.363 INFO running `"docker" "start" "-a" "bd69b702131882e5cca83f2b53e9d6825c95ad51640334f2f5d84bb813814464"`
Dec 11 23:01:42.076 INFO [stderr] usermod: no changes
Dec 11 23:01:42.097 INFO [stderr]     Checking learn_rust v0.1.0 (/source)
Dec 11 23:01:42.808 INFO [stderr] warning: unused variable: `x`
Dec 11 23:01:42.808 INFO [stderr]  --> src/test_lifetimes.rs:1:34
Dec 11 23:01:42.808 INFO [stderr]   |
Dec 11 23:01:42.808 INFO [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
Dec 11 23:01:42.808 INFO [stderr]   |                                  ^ help: consider using `_x` instead
Dec 11 23:01:42.808 INFO [stderr]   |
Dec 11 23:01:42.808 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 11 23:01:42.808 INFO [stderr] 
Dec 11 23:01:42.808 INFO [stderr] warning: unused variable: `z`
Dec 11 23:01:42.808 INFO [stderr]  --> src/test_lifetimes.rs:1:58
Dec 11 23:01:42.808 INFO [stderr]   |
Dec 11 23:01:42.808 INFO [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
Dec 11 23:01:42.808 INFO [stderr]   |                                                          ^ help: consider using `_z` instead
Dec 11 23:01:42.809 INFO [stderr] 
Dec 11 23:01:42.809 INFO [stderr] warning: variable `a` is assigned to, but never used
Dec 11 23:01:42.809 INFO [stderr]  --> src/test_lifetimes.rs:9:9
Dec 11 23:01:42.809 INFO [stderr]   |
Dec 11 23:01:42.809 INFO [stderr] 9 |     let a: &u32;
Dec 11 23:01:42.809 INFO [stderr]   |         ^
Dec 11 23:01:42.809 INFO [stderr]   |
Dec 11 23:01:42.809 INFO [stderr]   = note: consider using `_a` instead
Dec 11 23:01:42.809 INFO [stderr] 
Dec 11 23:01:42.809 INFO [stderr] warning: value assigned to `a` is never read
Dec 11 23:01:42.809 INFO [stderr]   --> src/test_lifetimes.rs:15:9
Dec 11 23:01:42.809 INFO [stderr]    |
Dec 11 23:01:42.809 INFO [stderr] 15 |         a = {
Dec 11 23:01:42.809 INFO [stderr]    |         ^
Dec 11 23:01:42.809 INFO [stderr]    |
Dec 11 23:01:42.812 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 11 23:01:42.812 INFO [stderr] 
Dec 11 23:01:42.876 INFO [stderr] warning: unused variable: `x`
Dec 11 23:01:42.877 INFO [stderr]  --> src/test_lifetimes.rs:1:34
Dec 11 23:01:42.877 INFO [stderr]   |
Dec 11 23:01:42.877 INFO [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
Dec 11 23:01:42.877 INFO [stderr]   |                                  ^ help: consider using `_x` instead
Dec 11 23:01:42.877 INFO [stderr]   |
Dec 11 23:01:42.877 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 11 23:01:42.877 INFO [stderr] 
Dec 11 23:01:42.877 INFO [stderr] warning: unused variable: `z`
Dec 11 23:01:42.877 INFO [stderr]  --> src/test_lifetimes.rs:1:58
Dec 11 23:01:42.877 INFO [stderr]   |
Dec 11 23:01:42.877 INFO [stderr] 1 | pub fn foo< 'c, 'b, 'a/*: 'b*/>( x: &'a u32, y: &'b u32, z: &'c u32 ) -> &'b u32 {
Dec 11 23:01:42.877 INFO [stderr]   |                                                          ^ help: consider using `_z` instead
Dec 11 23:01:42.877 INFO [stderr] 
Dec 11 23:01:42.877 INFO [stderr] warning: variable `a` is assigned to, but never used
Dec 11 23:01:42.877 INFO [stderr]  --> src/test_lifetimes.rs:9:9
Dec 11 23:01:42.877 INFO [stderr]   |
Dec 11 23:01:42.878 INFO [stderr] 9 |     let a: &u32;
Dec 11 23:01:42.878 INFO [stderr]   |         ^
Dec 11 23:01:42.878 INFO [stderr]   |
Dec 11 23:01:42.878 INFO [stderr]   = note: consider using `_a` instead
Dec 11 23:01:42.878 INFO [stderr] 
Dec 11 23:01:42.878 INFO [stderr] warning: value assigned to `a` is never read
Dec 11 23:01:42.878 INFO [stderr]   --> src/test_lifetimes.rs:15:9
Dec 11 23:01:42.878 INFO [stderr]    |
Dec 11 23:01:42.878 INFO [stderr] 15 |         a = {
Dec 11 23:01:42.878 INFO [stderr]    |         ^
Dec 11 23:01:42.878 INFO [stderr]    |
Dec 11 23:01:42.878 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 11 23:01:42.878 INFO [stderr] 
Dec 11 23:01:42.964 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
Dec 11 23:01:42.964 INFO [stderr] su: No module specific data is present
Dec 11 23:01:44.332 INFO running `"docker" "inspect" "bd69b702131882e5cca83f2b53e9d6825c95ad51640334f2f5d84bb813814464"`
Dec 11 23:01:44.652 INFO running `"docker" "rm" "-f" "bd69b702131882e5cca83f2b53e9d6825c95ad51640334f2f5d84bb813814464"`
Dec 11 23:01:44.944 INFO [stdout] bd69b702131882e5cca83f2b53e9d6825c95ad51640334f2f5d84bb813814464