[INFO] cloning repository https://github.com/oyas/rust-lang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/oyas/rust-lang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foyas%2Frust-lang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foyas%2Frust-lang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2ff9a1d5bd39b503a169e683f61d3495f4bdc4f3
[INFO] testing oyas/rust-lang against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foyas%2Frust-lang" "/workspace/builds/worker-102/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-102/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/oyas/rust-lang on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/oyas/rust-lang
[INFO] finished tweaking git repo https://github.com/oyas/rust-lang
[INFO] tweaked toml for git repo https://github.com/oyas/rust-lang written to /workspace/builds/worker-102/source/Cargo.toml
[INFO] crate git repo https://github.com/oyas/rust-lang already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f806bf86739c22ae8d266cbc67e15e861ab359533f70de7b475595b5505a0d8e
[INFO] running `Command { std: "docker" "start" "-a" "f806bf86739c22ae8d266cbc67e15e861ab359533f70de7b475595b5505a0d8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f806bf86739c22ae8d266cbc67e15e861ab359533f70de7b475595b5505a0d8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f806bf86739c22ae8d266cbc67e15e861ab359533f70de7b475595b5505a0d8e", kill_on_drop: false }`
[INFO] [stdout] f806bf86739c22ae8d266cbc67e15e861ab359533f70de7b475595b5505a0d8e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e0d58a059807352f663a8d7b2e4cac84a37720dda10a116630a913fd47235ef0
[INFO] running `Command { std: "docker" "start" "-a" "e0d58a059807352f663a8d7b2e4cac84a37720dda10a116630a913fd47235ef0", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling rustlang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/parser/parser.rs:169:29
[INFO] [stdout]     |
[INFO] [stdout] 169 | ...                   format!("Invalid syntax: unexpected element {:?}.", next.value)
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]     = note: this usage of assert!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the assert!() 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] 169 -                             format!("Invalid syntax: unexpected element {:?}.", next.value)
[INFO] [stdout] 169 +                             "Invalid syntax: unexpected element {:?}.", next.value
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:229:79
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     _ => panic!("Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                                                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     _ => panic!("{}", "Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:231:78
[INFO] [stdout]     |
[INFO] [stdout] 231 |                 None => panic!("Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                                                              ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 231 |                 None => panic!("{}", "Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:256:80
[INFO] [stdout]     |
[INFO] [stdout] 256 |                     _ => panic!("Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                                                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 256 |                     _ => panic!("{}", "Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:258:79
[INFO] [stdout]     |
[INFO] [stdout] 258 |                 None => panic!("Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                                                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 258 |                 None => panic!("{}", "Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:272:80
[INFO] [stdout]     |
[INFO] [stdout] 272 |                     _ => panic!("Invalid syntax: operator 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                                                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 272 |                     _ => panic!("{}", "Invalid syntax: operator 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:274:77
[INFO] [stdout]     |
[INFO] [stdout] 274 |                 None => panic!("Invalid syntax: symbol 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                                                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 274 |                 None => panic!("{}", "Invalid syntax: symbol 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser/element.rs:262:13
[INFO] [stdout]     |
[INFO] [stdout] 262 |             &child.print_with_prefix(fmt, &format!("{}. ", prefix));
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 262 |             let _ = &child.print_with_prefix(fmt, &format!("{}. ", prefix));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 28.56s
[INFO] running `Command { std: "docker" "inspect" "e0d58a059807352f663a8d7b2e4cac84a37720dda10a116630a913fd47235ef0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0d58a059807352f663a8d7b2e4cac84a37720dda10a116630a913fd47235ef0", kill_on_drop: false }`
[INFO] [stdout] e0d58a059807352f663a8d7b2e4cac84a37720dda10a116630a913fd47235ef0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1be08fdd4ea43f9a11df3c7b8b18f63f331bfdff592c627f2a84752ca877cad7
[INFO] running `Command { std: "docker" "start" "-a" "1be08fdd4ea43f9a11df3c7b8b18f63f331bfdff592c627f2a84752ca877cad7", kill_on_drop: false }`
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/parser/parser.rs:169:29
[INFO] [stdout]     |
[INFO] [stdout] 169 | ...                   format!("Invalid syntax: unexpected element {:?}.", next.value)
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]     = note: this usage of assert!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the assert!() 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] 169 -                             format!("Invalid syntax: unexpected element {:?}.", next.value)
[INFO] [stdout] 169 +                             "Invalid syntax: unexpected element {:?}.", next.value
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:229:79
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     _ => panic!("Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                                                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     _ => panic!("{}", "Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:231:78
[INFO] [stdout]     |
[INFO] [stdout] 231 |                 None => panic!("Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                                                              ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 231 |                 None => panic!("{}", "Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:256:80
[INFO] [stdout]     |
[INFO] [stdout] 256 |                     _ => panic!("Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                                                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 256 |                     _ => panic!("{}", "Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:258:79
[INFO] [stdout]     |
[INFO] [stdout] 258 |                 None => panic!("Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                                                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 258 |                 None => panic!("{}", "Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:272:80
[INFO] [stdout]     |
[INFO] [stdout] 272 |                     _ => panic!("Invalid syntax: operator 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                                                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 272 |                     _ => panic!("{}", "Invalid syntax: operator 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rustlang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:274:77
[INFO] [stdout]     |
[INFO] [stdout] 274 |                 None => panic!("Invalid syntax: symbol 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                                                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 274 |                 None => panic!("{}", "Invalid syntax: symbol 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser/element.rs:262:13
[INFO] [stdout]     |
[INFO] [stdout] 262 |             &child.print_with_prefix(fmt, &format!("{}. ", prefix));
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 262 |             let _ = &child.print_with_prefix(fmt, &format!("{}. ", prefix));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/examples.rs:10:35
[INFO] [stdout]    |
[INFO] [stdout] 10 |         assert!(result.is_some(), format!("Failed to run {}.", file_path));
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]    = note: this usage of assert!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the assert!() 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] 10 -         assert!(result.is_some(), format!("Failed to run {}.", file_path));
[INFO] [stdout] 10 +         assert!(result.is_some(), "Failed to run {}.", file_path);
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/parser/parser.rs:169:29
[INFO] [stdout]     |
[INFO] [stdout] 169 | ...                   format!("Invalid syntax: unexpected element {:?}.", next.value)
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]     = note: this usage of assert!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the assert!() 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] 169 -                             format!("Invalid syntax: unexpected element {:?}.", next.value)
[INFO] [stdout] 169 +                             "Invalid syntax: unexpected element {:?}.", next.value
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:229:79
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     _ => panic!("Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                                                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     _ => panic!("{}", "Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:231:78
[INFO] [stdout]     |
[INFO] [stdout] 231 |                 None => panic!("Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                                                              ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 231 |                 None => panic!("{}", "Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:256:80
[INFO] [stdout]     |
[INFO] [stdout] 256 |                     _ => panic!("Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                                                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 256 |                     _ => panic!("{}", "Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:258:79
[INFO] [stdout]     |
[INFO] [stdout] 258 |                 None => panic!("Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                                                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 258 |                 None => panic!("{}", "Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:272:80
[INFO] [stdout]     |
[INFO] [stdout] 272 |                     _ => panic!("Invalid syntax: operator 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                                                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 272 |                     _ => panic!("{}", "Invalid syntax: operator 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                 +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains a brace
[INFO] [stdout]    --> src/parser/parser.rs:274:77
[INFO] [stdout]     |
[INFO] [stdout] 274 |                 None => panic!("Invalid syntax: symbol 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                                                             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stdout] help: add a "{}" format string to use the message literally
[INFO] [stdout]     |
[INFO] [stdout] 274 |                 None => panic!("{}", "Invalid syntax: symbol 'fun' couldn't find '{' token."),
[INFO] [stdout]     |                                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/parser/element.rs:262:13
[INFO] [stdout]     |
[INFO] [stdout] 262 |             &child.print_with_prefix(fmt, &format!("{}. ", prefix));
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 262 |             let _ = &child.print_with_prefix(fmt, &format!("{}. ", prefix));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.59s
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "1be08fdd4ea43f9a11df3c7b8b18f63f331bfdff592c627f2a84752ca877cad7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1be08fdd4ea43f9a11df3c7b8b18f63f331bfdff592c627f2a84752ca877cad7", kill_on_drop: false }`
[INFO] [stdout] 1be08fdd4ea43f9a11df3c7b8b18f63f331bfdff592c627f2a84752ca877cad7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-102/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3b84cc13fad9727da9a81f4c15d240139b82c291222c118c581711a29f049ff8
[INFO] running `Command { std: "docker" "start" "-a" "3b84cc13fad9727da9a81f4c15d240139b82c291222c118c581711a29f049ff8", kill_on_drop: false }`
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]    --> src/parser/parser.rs:169:29
[INFO] [stderr]     |
[INFO] [stderr] 169 | ...                   format!("Invalid syntax: unexpected element {:?}.", next.value)
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stderr]     = note: this usage of assert!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stderr]     = note: the assert!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stderr] help: remove the `format!(..)` macro call
[INFO] [stderr]     |
[INFO] [stderr] 169 -                             format!("Invalid syntax: unexpected element {:?}.", next.value)
[INFO] [stderr] 169 +                             "Invalid syntax: unexpected element {:?}.", next.value
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains a brace
[INFO] [stderr]    --> src/parser/parser.rs:229:79
[INFO] [stderr]     |
[INFO] [stderr] 229 |                     _ => panic!("Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stderr]     |                                                                               ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]     |
[INFO] [stderr] 229 |                     _ => panic!("{}", "Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stderr]     |                                 +++++
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains a brace
[INFO] [stderr]    --> src/parser/parser.rs:231:78
[INFO] [stderr]     |
[INFO] [stderr] 231 |                 None => panic!("Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stderr]     |                                                                              ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]     |
[INFO] [stderr] 231 |                 None => panic!("{}", "Invalid syntax: operator 'if' couldn't find '{' token."),
[INFO] [stderr]     |                                +++++
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains a brace
[INFO] [stderr]    --> src/parser/parser.rs:256:80
[INFO] [stderr]     |
[INFO] [stderr] 256 |                     _ => panic!("Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stderr]     |                                                                                ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]     |
[INFO] [stderr] 256 |                     _ => panic!("{}", "Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stderr]     |                                 +++++
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains a brace
[INFO] [stderr]    --> src/parser/parser.rs:258:79
[INFO] [stderr]     |
[INFO] [stderr] 258 |                 None => panic!("Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stderr]     |                                                                               ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]     |
[INFO] [stderr] 258 |                 None => panic!("{}", "Invalid syntax: operator 'for' couldn't find '{' token."),
[INFO] [stderr]     |                                +++++
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains a brace
[INFO] [stderr]    --> src/parser/parser.rs:272:80
[INFO] [stderr]     |
[INFO] [stderr] 272 |                     _ => panic!("Invalid syntax: operator 'fun' couldn't find '{' token."),
[INFO] [stderr]     |                                                                                ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]     |
[INFO] [stderr] 272 |                     _ => panic!("{}", "Invalid syntax: operator 'fun' couldn't find '{' token."),
[INFO] [stderr]     |                                 +++++
[INFO] [stderr] 
[INFO] [stderr] warning: panic message contains a brace
[INFO] [stderr]    --> src/parser/parser.rs:274:77
[INFO] [stderr]     |
[INFO] [stderr] 274 |                 None => panic!("Invalid syntax: symbol 'fun' couldn't find '{' token."),
[INFO] [stderr]     |                                                                             ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this message is not used as a format string, but will be in Rust 2021
[INFO] [stderr] help: add a "{}" format string to use the message literally
[INFO] [stderr]     |
[INFO] [stderr] 274 |                 None => panic!("{}", "Invalid syntax: symbol 'fun' couldn't find '{' token."),
[INFO] [stderr]     |                                +++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]    --> src/parser/element.rs:262:13
[INFO] [stderr]     |
[INFO] [stderr] 262 |             &child.print_with_prefix(fmt, &format!("{}. ", prefix));
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 262 |             let _ = &child.print_with_prefix(fmt, &format!("{}. ", prefix));
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `rustlang` (lib) generated 8 warnings
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]   --> tests/examples.rs:10:35
[INFO] [stderr]    |
[INFO] [stderr] 10 |         assert!(result.is_some(), format!("Failed to run {}.", file_path));
[INFO] [stderr]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stderr]    = note: this usage of assert!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stderr]    = note: the assert!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stderr] help: remove the `format!(..)` macro call
[INFO] [stderr]    |
[INFO] [stderr] 10 -         assert!(result.is_some(), format!("Failed to run {}.", file_path));
[INFO] [stderr] 10 +         assert!(result.is_some(), "Failed to run {}.", file_path);
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: `rustlang` (lib test) generated 8 warnings (8 duplicates)
[INFO] [stderr] warning: `rustlang` (test "examples") generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rustlang-c40c7dc24fb3b824)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rustlang-172b39a5590986d0)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/examples.rs (/opt/rustwide/target/debug/deps/examples-0ec88d1185d721f7)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test run_examples ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rustlang
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3b84cc13fad9727da9a81f4c15d240139b82c291222c118c581711a29f049ff8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b84cc13fad9727da9a81f4c15d240139b82c291222c118c581711a29f049ff8", kill_on_drop: false }`
[INFO] [stdout] 3b84cc13fad9727da9a81f4c15d240139b82c291222c118c581711a29f049ff8