[INFO] crate wlambda 0.4.4 is already in cache
[INFO] checking wlambda-0.4.4 against master#7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3 for pr-71873
[INFO] extracting crate wlambda 0.4.4 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate wlambda 0.4.4 on toolchain 7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3
[INFO] running `"/workspace/cargo-home/bin/cargo" "+7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate wlambda 0.4.4
[INFO] finished tweaking crates.io crate wlambda 0.4.4
[INFO] tweaked toml for crates.io crate wlambda 0.4.4 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate wlambda 0.4.4 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+7c59a81a5fcbaaca311f744cd7c68d99bfbb05d3" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d20db529e0dae44e71cfdb6b1cb117cb9852d0e6c0982f4774915dc8a5e21f16
[INFO] running `"docker" "start" "-a" "d20db529e0dae44e71cfdb6b1cb117cb9852d0e6c0982f4774915dc8a5e21f16"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling nix v0.13.1
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]     Checking unicode-segmentation v1.6.0
[INFO] [stderr]     Checking num-integer v0.1.42
[INFO] [stderr]     Checking rmp v0.8.9
[INFO] [stderr]     Checking regex v1.3.3
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking rustyline v4.1.0
[INFO] [stderr]     Checking serde_json v1.0.45
[INFO] [stderr]     Checking rmp-serde v0.14.0
[INFO] [stderr]     Checking wlambda v0.4.4 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/vval.rs:353:9
[INFO] [stderr]     |
[INFO] [stderr] 353 |         std::mem::replace(&mut self.current_self, old_self);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/vval.rs:615:9
[INFO] [stderr]     |
[INFO] [stderr] 615 |         std::mem::replace(&mut self.accum_fun, old_fun);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/vval.rs:353:9
[INFO] [stderr]     |
[INFO] [stderr] 353 |         std::mem::replace(&mut self.current_self, old_self);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/vval.rs:615:9
[INFO] [stderr]     |
[INFO] [stderr] 615 |         std::mem::replace(&mut self.accum_fun, old_fun);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/threads.rs:549:17
[INFO] [stderr]     |
[INFO] [stderr] 549 | /                 std::mem::replace(
[INFO] [stderr] 550 | |                     &mut *i,
[INFO] [stderr] 551 | |                     ctx.eval("$[std:pop X, std:pop X]").unwrap().s());
[INFO] [stderr]     | |______________________________________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/threads.rs:594:17
[INFO] [stderr]     |
[INFO] [stderr] 594 | /                 std::mem::replace(
[INFO] [stderr] 595 | |                     &mut *i,
[INFO] [stderr] 596 | |                     ctx.eval("std:pop X").unwrap().i());
[INFO] [stderr]     | |________________________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/threads.rs:641:17
[INFO] [stderr]     |
[INFO] [stderr] 641 | /                 std::mem::replace(
[INFO] [stderr] 642 | |                     &mut *i, ctx.eval("X").unwrap().s());
[INFO] [stderr]     | |_________________________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/vval.rs:353:9
[INFO] [stderr]     |
[INFO] [stderr] 353 |         std::mem::replace(&mut self.current_self, old_self);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/vval.rs:615:9
[INFO] [stderr]     |
[INFO] [stderr] 615 |         std::mem::replace(&mut self.accum_fun, old_fun);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/vval.rs:353:9
[INFO] [stderr]     |
[INFO] [stderr] 353 |         std::mem::replace(&mut self.current_self, old_self);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/vval.rs:615:9
[INFO] [stderr]     |
[INFO] [stderr] 615 |         std::mem::replace(&mut self.accum_fun, old_fun);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.28s
[INFO] running `"docker" "inspect" "d20db529e0dae44e71cfdb6b1cb117cb9852d0e6c0982f4774915dc8a5e21f16"`
[INFO] running `"docker" "rm" "-f" "d20db529e0dae44e71cfdb6b1cb117cb9852d0e6c0982f4774915dc8a5e21f16"`
[INFO] [stdout] d20db529e0dae44e71cfdb6b1cb117cb9852d0e6c0982f4774915dc8a5e21f16