Jul 12 10:54:21.449 INFO checking discard-1.0.3 against try#d39a6f7eddafd45dcc60e99001b8cd08c2bd3255 for pr-52234 Jul 12 10:54:21.449 INFO running: cargo +d39a6f7eddafd45dcc60e99001b8cd08c2bd3255-alt check --frozen --all --all-targets Jul 12 10:54:21.449 INFO creating container for: cargo +d39a6f7eddafd45dcc60e99001b8cd08c2bd3255-alt check --frozen --all --all-targets Jul 12 10:54:21.449 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-1/pr-52234/try#d39a6f7eddafd45dcc60e99001b8cd08c2bd3255:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-52234/worker-1/try#d39a6f7eddafd45dcc60e99001b8cd08c2bd3255:/target:rw,Z" "-v" "/home/ec2-user/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/home/ec2-user/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=500" "-e" "CMD=cargo +d39a6f7eddafd45dcc60e99001b8cd08c2bd3255-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "crater"` Jul 12 10:54:21.718 INFO blam! 82f1072fd88cec16301aca11a9211cd88649ec4c9569028e26fddecb6ebe7929 Jul 12 10:54:21.721 INFO running `"docker" "start" "-a" "82f1072fd88cec16301aca11a9211cd88649ec4c9569028e26fddecb6ebe7929"` Jul 12 10:54:22.968 INFO kablam! Checking discard v1.0.3 (file:///source) Jul 12 10:54:24.290 INFO kablam! warning: unused `DiscardOnDrop` which must be used Jul 12 10:54:24.290 INFO kablam! --> src/lib.rs:251:9 Jul 12 10:54:24.290 INFO kablam! | Jul 12 10:54:24.291 INFO kablam! 251 | DiscardOnDrop::new(Foo::new()); Jul 12 10:54:24.291 INFO kablam! | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Jul 12 10:54:24.291 INFO kablam! | Jul 12 10:54:24.291 INFO kablam! = note: #[warn(unused_must_use)] on by default Jul 12 10:54:24.291 INFO kablam! = note: Jul 12 10:54:24.291 INFO kablam! Jul 12 10:54:24.291 INFO kablam! The DiscardOnDrop is unused, which causes it to be immediately discarded. Jul 12 10:54:24.291 INFO kablam! You probably don't want that to happen. Jul 12 10:54:24.291 INFO kablam! Jul 12 10:54:24.291 INFO kablam! How to fix this: Jul 12 10:54:24.291 INFO kablam! Jul 12 10:54:24.291 INFO kablam! * Store the DiscardOnDrop in a variable or data structure. Jul 12 10:54:24.291 INFO kablam! Jul 12 10:54:24.291 INFO kablam! * Or use the DiscardOnDrop::leak function which will cause it to not be Jul 12 10:54:24.291 INFO kablam! discarded (this *will* leak memory!). Jul 12 10:54:24.291 INFO kablam! Jul 12 10:54:24.291 INFO kablam! See the documentation for more details. Jul 12 10:54:24.291 INFO kablam! Jul 12 10:54:24.291 INFO kablam! Jul 12 10:54:24.317 INFO kablam! Finished dev [unoptimized + debuginfo] target(s) in 1.38s Jul 12 10:54:24.319 INFO kablam! su: No module specific data is present Jul 12 10:54:24.843 INFO running `"docker" "rm" "-f" "82f1072fd88cec16301aca11a9211cd88649ec4c9569028e26fddecb6ebe7929"` Jul 12 10:54:25.026 INFO blam! 82f1072fd88cec16301aca11a9211cd88649ec4c9569028e26fddecb6ebe7929