[INFO] fetching crate flatbuffers 0.8.3...
[INFO] checking flatbuffers-0.8.3 against master#195ad4830e11a544391abe296b146450dea8411b for pr-82781
[INFO] extracting crate flatbuffers 0.8.3 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate flatbuffers 0.8.3 on toolchain 195ad4830e11a544391abe296b146450dea8411b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "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-11/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 695e3caed94b96bec3ecb3204d2c0f339ce2733f76e7bee79ca9fcbf9dc05b60
[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" "695e3caed94b96bec3ecb3204d2c0f339ce2733f76e7bee79ca9fcbf9dc05b60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "695e3caed94b96bec3ecb3204d2c0f339ce2733f76e7bee79ca9fcbf9dc05b60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "695e3caed94b96bec3ecb3204d2c0f339ce2733f76e7bee79ca9fcbf9dc05b60", kill_on_drop: false }`
[INFO] [stdout] 695e3caed94b96bec3ecb3204d2c0f339ce2733f76e7bee79ca9fcbf9dc05b60
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f7b0a7c9bfc11b80ff5386a3469518d9db5f644b11b6a25236e4d0787c2e9885
[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" "f7b0a7c9bfc11b80ff5386a3469518d9db5f644b11b6a25236e4d0787c2e9885", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.64
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
[INFO] [stderr]     Checking thiserror v1.0.24
[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: 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: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.66s
[INFO] running `Command { std: "docker" "inspect" "f7b0a7c9bfc11b80ff5386a3469518d9db5f644b11b6a25236e4d0787c2e9885", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7b0a7c9bfc11b80ff5386a3469518d9db5f644b11b6a25236e4d0787c2e9885", kill_on_drop: false }`
[INFO] [stdout] f7b0a7c9bfc11b80ff5386a3469518d9db5f644b11b6a25236e4d0787c2e9885