[INFO] fetching crate flatbuffers 0.8.3...
[INFO] checking flatbuffers-0.8.3 against master#a836d9b6413d9d593be6c09463ff8c4c70e56599 for pr-84037
[INFO] extracting crate flatbuffers 0.8.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate flatbuffers 0.8.3 on toolchain a836d9b6413d9d593be6c09463ff8c4c70e56599
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flatbuffers 0.8.3
[INFO] finished tweaking crates.io crate flatbuffers 0.8.3
[INFO] tweaked toml for crates.io crate flatbuffers 0.8.3 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4044695a9fe93ef23bf8afc4f6bd29c4800f0f840bd701f8703e3b5576cae6fe
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4044695a9fe93ef23bf8afc4f6bd29c4800f0f840bd701f8703e3b5576cae6fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4044695a9fe93ef23bf8afc4f6bd29c4800f0f840bd701f8703e3b5576cae6fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4044695a9fe93ef23bf8afc4f6bd29c4800f0f840bd701f8703e3b5576cae6fe", kill_on_drop: false }`
[INFO] [stdout] 4044695a9fe93ef23bf8afc4f6bd29c4800f0f840bd701f8703e3b5576cae6fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a836d9b6413d9d593be6c09463ff8c4c70e56599" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e00f705a693ca74c40da67f3a8a6e9cc601c5ad1d138ef37ed78036da2617f0f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e00f705a693ca74c40da67f3a8a6e9cc601c5ad1d138ef37ed78036da2617f0f", kill_on_drop: false }`
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking flatbuffers v0.8.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/builder.rs:731:13
[INFO] [stdout]     |
[INFO] [stdout] 731 | /             format!(
[INFO] [stdout] 732 | |                 "incorrect FlatBufferBuilder usage: {} must be called while in a nested state",
[INFO] [stdout] 733 | |                 fn_name
[INFO] [stdout] 734 | |             )
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout]     = note: the panic!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 731 |             
[INFO] [stdout] 732 |                 "incorrect FlatBufferBuilder usage: {} must be called while in a nested state",
[INFO] [stdout] 733 |                 fn_name
[INFO] [stdout] 734 |             
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/builder.rs:739:37
[INFO] [stdout]     |
[INFO] [stdout] 739 |         debug_assert!(!self.nested, msg);
[INFO] [stdout]     |                                     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 739 |         debug_assert!(!self.nested, "{}", msg);
[INFO] [stdout]     |                                     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/builder.rs:743:38
[INFO] [stdout]     |
[INFO] [stdout] 743 |         debug_assert!(self.finished, msg);
[INFO] [stdout]     |                                      ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 743 |         debug_assert!(self.finished, "{}", msg);
[INFO] [stdout]     |                                      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/builder.rs:747:39
[INFO] [stdout]     |
[INFO] [stdout] 747 |         debug_assert!(!self.finished, msg);
[INFO] [stdout]     |                                       ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 747 |         debug_assert!(!self.finished, "{}", msg);
[INFO] [stdout]     |                                       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/builder.rs:731:13
[INFO] [stdout]     |
[INFO] [stdout] 731 | /             format!(
[INFO] [stdout] 732 | |                 "incorrect FlatBufferBuilder usage: {} must be called while in a nested state",
[INFO] [stdout] 733 | |                 fn_name
[INFO] [stdout] 734 | |             )
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout]     = note: the panic!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 731 |             
[INFO] [stdout] 732 |                 "incorrect FlatBufferBuilder usage: {} must be called while in a nested state",
[INFO] [stdout] 733 |                 fn_name
[INFO] [stdout] 734 |             
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/builder.rs:739:37
[INFO] [stdout]     |
[INFO] [stdout] 739 |         debug_assert!(!self.nested, msg);
[INFO] [stdout]     |                                     ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 739 |         debug_assert!(!self.nested, "{}", msg);
[INFO] [stdout]     |                                     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/builder.rs:743:38
[INFO] [stdout]     |
[INFO] [stdout] 743 |         debug_assert!(self.finished, msg);
[INFO] [stdout]     |                                      ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 743 |         debug_assert!(self.finished, "{}", msg);
[INFO] [stdout]     |                                      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/builder.rs:747:39
[INFO] [stdout]     |
[INFO] [stdout] 747 |         debug_assert!(!self.finished, msg);
[INFO] [stdout]     |                                       ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 747 |         debug_assert!(!self.finished, "{}", msg);
[INFO] [stdout]     |                                       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.72s
[INFO] running `Command { std: "docker" "inspect" "e00f705a693ca74c40da67f3a8a6e9cc601c5ad1d138ef37ed78036da2617f0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e00f705a693ca74c40da67f3a8a6e9cc601c5ad1d138ef37ed78036da2617f0f", kill_on_drop: false }`
[INFO] [stdout] e00f705a693ca74c40da67f3a8a6e9cc601c5ad1d138ef37ed78036da2617f0f