[INFO] fetching crate optfield 0.1.0...
[INFO] checking optfield-0.1.0 against master#836c31742687ba4e2f857b5b698e1e9e6b67619c for pr-81789
[INFO] extracting crate optfield 0.1.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate optfield 0.1.0 on toolchain 836c31742687ba4e2f857b5b698e1e9e6b67619c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate optfield 0.1.0
[INFO] finished tweaking crates.io crate optfield 0.1.0
[INFO] tweaked toml for crates.io crate optfield 0.1.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 11d7d7d07c28a950a5ad42d75e7f787425d43e4270ff464fcb63d4ded27445f7
[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" "11d7d7d07c28a950a5ad42d75e7f787425d43e4270ff464fcb63d4ded27445f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "11d7d7d07c28a950a5ad42d75e7f787425d43e4270ff464fcb63d4ded27445f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "11d7d7d07c28a950a5ad42d75e7f787425d43e4270ff464fcb63d4ded27445f7", kill_on_drop: false }`
[INFO] [stdout] 11d7d7d07c28a950a5ad42d75e7f787425d43e4270ff464fcb63d4ded27445f7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69d7057c984c53bea41d6b137ea13869b71e3d5c9c958917bf79ccb85eac650b
[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" "69d7057c984c53bea41d6b137ea13869b71e3d5c9c958917bf79ccb85eac650b", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]     Checking proc-macro2 v1.0.26
[INFO] [stderr]    Compiling optfield v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/generator.rs:40:40
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| panic!(error::unexpected(self.error_action_text(), e)))
[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] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| panic!("{}", error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| std::panic::panic_any(error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/generator.rs:89:40
[INFO] [stdout]    |
[INFO] [stdout] 89 |             .unwrap_or_else(|e| panic!(error::unexpected(self.error_action_text(), e)))
[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] 89 |             .unwrap_or_else(|e| panic!("{}", error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 89 |             .unwrap_or_else(|e| std::panic::panic_any(error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/mod.rs:45:59
[INFO] [stdout]    |
[INFO] [stdout] 45 |             Some(parse2(tokens).unwrap_or_else(|e| panic!(unexpected(self.error_action_text(), e))))
[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] 45 |             Some(parse2(tokens).unwrap_or_else(|e| panic!("{}", unexpected(self.error_action_text(), e))))
[INFO] [stdout]    |                                                           ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 45 |             Some(parse2(tokens).unwrap_or_else(|e| std::panic::panic_any(unexpected(self.error_action_text(), e))))
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/fields/mod.rs:32:40
[INFO] [stdout]    |
[INFO] [stdout] 32 |             .unwrap_or_else(|e| panic!(unexpected(format!("generating {} fields", item_name), e)));
[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] 32 |             .unwrap_or_else(|e| panic!("{}", unexpected(format!("generating {} fields", item_name), e)));
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 32 |             .unwrap_or_else(|e| std::panic::panic_any(unexpected(format!("generating {} fields", item_name), e)));
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking quote v1.0.9
[INFO] [stderr]     Checking syn v1.0.70
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/generator.rs:40:40
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| panic!(error::unexpected(self.error_action_text(), e)))
[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] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| panic!("{}", error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| std::panic::panic_any(error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/generator.rs:89:40
[INFO] [stdout]    |
[INFO] [stdout] 89 |             .unwrap_or_else(|e| panic!(error::unexpected(self.error_action_text(), e)))
[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] 89 |             .unwrap_or_else(|e| panic!("{}", error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 89 |             .unwrap_or_else(|e| std::panic::panic_any(error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/mod.rs:45:59
[INFO] [stdout]    |
[INFO] [stdout] 45 |             Some(parse2(tokens).unwrap_or_else(|e| panic!(unexpected(self.error_action_text(), e))))
[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] 45 |             Some(parse2(tokens).unwrap_or_else(|e| panic!("{}", unexpected(self.error_action_text(), e))))
[INFO] [stdout]    |                                                           ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 45 |             Some(parse2(tokens).unwrap_or_else(|e| std::panic::panic_any(unexpected(self.error_action_text(), e))))
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/fields/mod.rs:32:40
[INFO] [stdout]    |
[INFO] [stdout] 32 |             .unwrap_or_else(|e| panic!(unexpected(format!("generating {} fields", item_name), e)));
[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] 32 |             .unwrap_or_else(|e| panic!("{}", unexpected(format!("generating {} fields", item_name), e)));
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 32 |             .unwrap_or_else(|e| std::panic::panic_any(unexpected(format!("generating {} fields", item_name), e)));
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> tests/merge.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/generator.rs:40:40
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| panic!(error::unexpected(self.error_action_text(), e)))
[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] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| panic!("{}", error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 40 |             .unwrap_or_else(|e| std::panic::panic_any(error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/generator.rs:89:40
[INFO] [stdout]    |
[INFO] [stdout] 89 |             .unwrap_or_else(|e| panic!(error::unexpected(self.error_action_text(), e)))
[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] 89 |             .unwrap_or_else(|e| panic!("{}", error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 89 |             .unwrap_or_else(|e| std::panic::panic_any(error::unexpected(self.error_action_text(), e)))
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/attrs/mod.rs:45:59
[INFO] [stdout]    |
[INFO] [stdout] 45 |             Some(parse2(tokens).unwrap_or_else(|e| panic!(unexpected(self.error_action_text(), e))))
[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] 45 |             Some(parse2(tokens).unwrap_or_else(|e| panic!("{}", unexpected(self.error_action_text(), e))))
[INFO] [stdout]    |                                                           ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 45 |             Some(parse2(tokens).unwrap_or_else(|e| std::panic::panic_any(unexpected(self.error_action_text(), e))))
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/fields/mod.rs:32:40
[INFO] [stdout]    |
[INFO] [stdout] 32 |             .unwrap_or_else(|e| panic!(unexpected(format!("generating {} fields", item_name), e)));
[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] 32 |             .unwrap_or_else(|e| panic!("{}", unexpected(format!("generating {} fields", item_name), e)));
[INFO] [stdout]    |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 32 |             .unwrap_or_else(|e| std::panic::panic_any(unexpected(format!("generating {} fields", item_name), e)));
[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 9.77s
[INFO] running `Command { std: "docker" "inspect" "69d7057c984c53bea41d6b137ea13869b71e3d5c9c958917bf79ccb85eac650b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69d7057c984c53bea41d6b137ea13869b71e3d5c9c958917bf79ccb85eac650b", kill_on_drop: false }`
[INFO] [stdout] 69d7057c984c53bea41d6b137ea13869b71e3d5c9c958917bf79ccb85eac650b