Dec 12 15:49:42.417 INFO checking discard-1.0.4 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 15:49:42.417 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 12 15:49:42.936 INFO [stdout] 6e558851f5d8dda0d6bfa5655fff228d385733378693c115bafe84b01f95eab6
Dec 12 15:49:42.944 INFO running `"docker" "start" "-a" "6e558851f5d8dda0d6bfa5655fff228d385733378693c115bafe84b01f95eab6"`
Dec 12 15:49:44.042 INFO [stderr] usermod: no changes
Dec 12 15:49:44.078 INFO [stderr]     Checking discard v1.0.4 (/source)
Dec 12 15:49:44.944 INFO [stderr] warning: unused `DiscardOnDrop` that must be used
Dec 12 15:49:44.944 INFO [stderr]    --> src/lib.rs:261:9
Dec 12 15:49:44.944 INFO [stderr]     |
Dec 12 15:49:44.944 INFO [stderr] 261 |         DiscardOnDrop::new(Foo::new());
Dec 12 15:49:44.944 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 15:49:44.944 INFO [stderr]     |
Dec 12 15:49:44.944 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 12 15:49:44.944 INFO [stderr]     = note: 
Dec 12 15:49:44.944 INFO [stderr]             The DiscardOnDrop is unused, which causes it to be immediately discarded.
Dec 12 15:49:44.944 INFO [stderr]             You probably don't want that to happen.
Dec 12 15:49:44.944 INFO [stderr]             
Dec 12 15:49:44.944 INFO [stderr]             How to fix this:
Dec 12 15:49:44.944 INFO [stderr]             
Dec 12 15:49:44.944 INFO [stderr]               * Store the DiscardOnDrop in a variable or data structure.
Dec 12 15:49:44.944 INFO [stderr]             
Dec 12 15:49:44.944 INFO [stderr]               * Or use the DiscardOnDrop::leak function which will cause it to not be
Dec 12 15:49:44.944 INFO [stderr]                 discarded (this *will* leak memory!).
Dec 12 15:49:44.944 INFO [stderr]             
Dec 12 15:49:44.944 INFO [stderr]             See the DiscardOnDrop documentation for more details.
Dec 12 15:49:44.944 INFO [stderr] 
Dec 12 15:49:44.944 INFO [stderr] warning: unused `DiscardOnDrop` that must be used
Dec 12 15:49:44.944 INFO [stderr]    --> src/lib.rs:262:9
Dec 12 15:49:44.944 INFO [stderr]     |
Dec 12 15:49:44.944 INFO [stderr] 262 |         DiscardOnDrop::new(Foo::new());
Dec 12 15:49:44.944 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 15:49:44.944 INFO [stderr]     |
Dec 12 15:49:44.944 INFO [stderr]     = note: 
Dec 12 15:49:44.944 INFO [stderr]             The DiscardOnDrop is unused, which causes it to be immediately discarded.
Dec 12 15:49:44.944 INFO [stderr]             You probably don't want that to happen.
Dec 12 15:49:44.944 INFO [stderr]             
Dec 12 15:49:44.944 INFO [stderr]             How to fix this:
Dec 12 15:49:44.944 INFO [stderr]             
Dec 12 15:49:44.944 INFO [stderr]               * Store the DiscardOnDrop in a variable or data structure.
Dec 12 15:49:44.944 INFO [stderr]             
Dec 12 15:49:44.944 INFO [stderr]               * Or use the DiscardOnDrop::leak function which will cause it to not be
Dec 12 15:49:44.944 INFO [stderr]                 discarded (this *will* leak memory!).
Dec 12 15:49:44.944 INFO [stderr]             
Dec 12 15:49:44.944 INFO [stderr]             See the DiscardOnDrop documentation for more details.
Dec 12 15:49:44.944 INFO [stderr] 
Dec 12 15:49:44.991 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
Dec 12 15:49:44.991 INFO [stderr] su: No module specific data is present
Dec 12 15:49:45.577 INFO running `"docker" "inspect" "6e558851f5d8dda0d6bfa5655fff228d385733378693c115bafe84b01f95eab6"`
Dec 12 15:49:45.766 INFO running `"docker" "rm" "-f" "6e558851f5d8dda0d6bfa5655fff228d385733378693c115bafe84b01f95eab6"`
Dec 12 15:49:46.229 INFO [stdout] 6e558851f5d8dda0d6bfa5655fff228d385733378693c115bafe84b01f95eab6