[INFO] cloning repository https://github.com/zgotts/rendrr
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zgotts/rendrr" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzgotts%2Frendrr", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzgotts%2Frendrr'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 31367f4332c8e6b566bcaee42c74cd6242eefe1c
[INFO] checking zgotts/rendrr against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzgotts%2Frendrr" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zgotts/rendrr on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zgotts/rendrr
[INFO] finished tweaking git repo https://github.com/zgotts/rendrr
[INFO] tweaked toml for git repo https://github.com/zgotts/rendrr written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/zgotts/rendrr already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce02126496be8d182bd0fc7fd39d4a934312d9db0675b3ae60c857db6cf6a6d8
[INFO] running `Command { std: "docker" "start" "-a" "ce02126496be8d182bd0fc7fd39d4a934312d9db0675b3ae60c857db6cf6a6d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce02126496be8d182bd0fc7fd39d4a934312d9db0675b3ae60c857db6cf6a6d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce02126496be8d182bd0fc7fd39d4a934312d9db0675b3ae60c857db6cf6a6d8", kill_on_drop: false }`
[INFO] [stdout] ce02126496be8d182bd0fc7fd39d4a934312d9db0675b3ae60c857db6cf6a6d8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8077a3d0f2eae26aed4c3c94ba1547d6d03383b1846b915b8a208301a6287387
[INFO] running `Command { std: "docker" "start" "-a" "8077a3d0f2eae26aed4c3c94ba1547d6d03383b1846b915b8a208301a6287387", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.5
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling cfg-if v0.1.4
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]     Checking bitflags v0.7.0
[INFO] [stderr]    Compiling sdl2-sys v0.31.0
[INFO] [stderr]     Checking getopts v0.2.18
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking sdl2 v0.31.0
[INFO] [stderr]     Checking rendrr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:130:16
[INFO] [stdout]     |
[INFO] [stdout] 130 |             '0'...'9' => self.parse_length(),
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:158:16
[INFO] [stdout]     |
[INFO] [stdout] 158 |             '0'...'9' | '.' => true,
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:12
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:24
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |                        ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:36
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |                                    ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:28
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:40
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                                        ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `sdl2` is imported redundantly
[INFO] [stdout]  --> src/sdlbackend.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sdl2;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | extern crate sdl2;
[INFO] [stdout]   | ------------------ the item `sdl2` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:130:16
[INFO] [stdout]     |
[INFO] [stdout] 130 |             '0'...'9' => self.parse_length(),
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:158:16
[INFO] [stdout]     |
[INFO] [stdout] 158 |             '0'...'9' | '.' => true,
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:12
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:24
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |                        ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:36
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |                                    ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:28
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:40
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                                        ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `sdl2` is imported redundantly
[INFO] [stdout]  --> src/sdlbackend.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sdl2;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | extern crate sdl2;
[INFO] [stdout]   | ------------------ the item `sdl2` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/layout.rs:301:32
[INFO] [stdout]     |
[INFO] [stdout] 301 |                 if let Keyword(mut font_name) = font_style {
[INFO] [stdout]     |                                ----^^^^^^^^^
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/painting.rs:37:35
[INFO] [stdout]    |
[INFO] [stdout] 37 |             if let Value::Keyword(mut font_name) = font_style {
[INFO] [stdout]    |                                   ----^^^^^^^^^
[INFO] [stdout]    |                                   |
[INFO] [stdout]    |                                   help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `FONT_STYLE` is never used
[INFO] [stdout]   --> src/text.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | static FONT_STYLE: sdl2::ttf::FontStyle = sdl2::ttf::STYLE_BOLD;
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/main.rs:49:28
[INFO] [stdout]    |
[INFO] [stdout] 49 |         Err(f) => { panic!(f.to_string()) }
[INFO] [stdout]    |                            ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `panic!()` 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: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: add a "{}" format string to `Display` the message
[INFO] [stdout]    |
[INFO] [stdout] 49 |         Err(f) => { panic!("{}", f.to_string()) }
[INFO] [stdout]    |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/layout.rs:301:32
[INFO] [stdout]     |
[INFO] [stdout] 301 |                 if let Keyword(mut font_name) = font_style {
[INFO] [stdout]     |                                ----^^^^^^^^^
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/painting.rs:37:35
[INFO] [stdout]    |
[INFO] [stdout] 37 |             if let Value::Keyword(mut font_name) = font_style {
[INFO] [stdout]    |                                   ----^^^^^^^^^
[INFO] [stdout]    |                                   |
[INFO] [stdout]    |                                   help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `FONT_STYLE` is never used
[INFO] [stdout]   --> src/text.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | static FONT_STYLE: sdl2::ttf::FontStyle = sdl2::ttf::STYLE_BOLD;
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/main.rs:49:28
[INFO] [stdout]    |
[INFO] [stdout] 49 |         Err(f) => { panic!(f.to_string()) }
[INFO] [stdout]    |                            ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `panic!()` 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: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: add a "{}" format string to `Display` the message
[INFO] [stdout]    |
[INFO] [stdout] 49 |         Err(f) => { panic!("{}", f.to_string()) }
[INFO] [stdout]    |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.81s
[INFO] running `Command { std: "docker" "inspect" "8077a3d0f2eae26aed4c3c94ba1547d6d03383b1846b915b8a208301a6287387", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8077a3d0f2eae26aed4c3c94ba1547d6d03383b1846b915b8a208301a6287387", kill_on_drop: false }`
[INFO] [stdout] 8077a3d0f2eae26aed4c3c94ba1547d6d03383b1846b915b8a208301a6287387
[INFO] checking zgotts/rendrr against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzgotts%2Frendrr" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zgotts/rendrr on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zgotts/rendrr
[INFO] finished tweaking git repo https://github.com/zgotts/rendrr
[INFO] tweaked toml for git repo https://github.com/zgotts/rendrr written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/zgotts/rendrr already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ac8da21c1489cca5ca7f788fd6c213ea82313283ca633f46eeef89c592b5dbd7
[INFO] running `Command { std: "docker" "start" "-a" "ac8da21c1489cca5ca7f788fd6c213ea82313283ca633f46eeef89c592b5dbd7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac8da21c1489cca5ca7f788fd6c213ea82313283ca633f46eeef89c592b5dbd7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac8da21c1489cca5ca7f788fd6c213ea82313283ca633f46eeef89c592b5dbd7", kill_on_drop: false }`
[INFO] [stdout] ac8da21c1489cca5ca7f788fd6c213ea82313283ca633f46eeef89c592b5dbd7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 659cdb7b068e877f87f6fe4c3757d0e00dad155d12fdf3041c2ecc1d98162771
[INFO] running `Command { std: "docker" "start" "-a" "659cdb7b068e877f87f6fe4c3757d0e00dad155d12fdf3041c2ecc1d98162771", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.5
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling cfg-if v0.1.4
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking bitflags v0.7.0
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]    Compiling sdl2-sys v0.31.0
[INFO] [stderr]     Checking getopts v0.2.18
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking sdl2 v0.31.0
[INFO] [stderr]     Checking rendrr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:130:16
[INFO] [stdout]     |
[INFO] [stdout] 130 |             '0'...'9' => self.parse_length(),
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:158:16
[INFO] [stdout]     |
[INFO] [stdout] 158 |             '0'...'9' | '.' => true,
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:12
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:24
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |                        ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:36
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |                                    ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:28
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:40
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                                        ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `sdl2` is imported redundantly
[INFO] [stdout]  --> src/sdlbackend.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sdl2;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | extern crate sdl2;
[INFO] [stdout]   | ------------------ the item `sdl2` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:130:16
[INFO] [stdout]     |
[INFO] [stdout] 130 |             '0'...'9' => self.parse_length(),
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:158:16
[INFO] [stdout]     |
[INFO] [stdout] 158 |             '0'...'9' | '.' => true,
[INFO] [stdout]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:12
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:24
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |                        ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/css.rs:286:36
[INFO] [stdout]     |
[INFO] [stdout] 286 |         'a'...'z' | 'A'...'Z' | '0'...'9' | '-' | '_' => true,
[INFO] [stdout]     |                                    ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:28
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/html.rs:65:40
[INFO] [stdout]    |
[INFO] [stdout] 65 |             'a'...'z' | 'A'...'Z' | '0'...'9' => true,
[INFO] [stdout]    |                                        ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `sdl2` is imported redundantly
[INFO] [stdout]  --> src/sdlbackend.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sdl2;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | extern crate sdl2;
[INFO] [stdout]   | ------------------ the item `sdl2` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/layout.rs:301:32
[INFO] [stdout]     |
[INFO] [stdout] 301 |                 if let Keyword(mut font_name) = font_style {
[INFO] [stdout]     |                                ----^^^^^^^^^
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/painting.rs:37:35
[INFO] [stdout]    |
[INFO] [stdout] 37 |             if let Value::Keyword(mut font_name) = font_style {
[INFO] [stdout]    |                                   ----^^^^^^^^^
[INFO] [stdout]    |                                   |
[INFO] [stdout]    |                                   help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/layout.rs:301:32
[INFO] [stdout]     |
[INFO] [stdout] 301 |                 if let Keyword(mut font_name) = font_style {
[INFO] [stdout]     |                                ----^^^^^^^^^
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/painting.rs:37:35
[INFO] [stdout]    |
[INFO] [stdout] 37 |             if let Value::Keyword(mut font_name) = font_style {
[INFO] [stdout]    |                                   ----^^^^^^^^^
[INFO] [stdout]    |                                   |
[INFO] [stdout]    |                                   help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `FONT_STYLE` is never used
[INFO] [stdout]   --> src/text.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | static FONT_STYLE: sdl2::ttf::FontStyle = sdl2::ttf::STYLE_BOLD;
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/main.rs:49:28
[INFO] [stdout]    |
[INFO] [stdout] 49 |         Err(f) => { panic!(f.to_string()) }
[INFO] [stdout]    |                            ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `panic!()` 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: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: add a "{}" format string to `Display` the message
[INFO] [stdout]    |
[INFO] [stdout] 49 |         Err(f) => { panic!("{}", f.to_string()) }
[INFO] [stdout]    |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `FONT_STYLE` is never used
[INFO] [stdout]   --> src/text.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | static FONT_STYLE: sdl2::ttf::FontStyle = sdl2::ttf::STYLE_BOLD;
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/main.rs:49:28
[INFO] [stdout]    |
[INFO] [stdout] 49 |         Err(f) => { panic!(f.to_string()) }
[INFO] [stdout]    |                            ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `panic!()` 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: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout] help: add a "{}" format string to `Display` the message
[INFO] [stdout]    |
[INFO] [stdout] 49 |         Err(f) => { panic!("{}", f.to_string()) }
[INFO] [stdout]    |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.42s
[INFO] running `Command { std: "docker" "inspect" "659cdb7b068e877f87f6fe4c3757d0e00dad155d12fdf3041c2ecc1d98162771", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "659cdb7b068e877f87f6fe4c3757d0e00dad155d12fdf3041c2ecc1d98162771", kill_on_drop: false }`
[INFO] [stdout] 659cdb7b068e877f87f6fe4c3757d0e00dad155d12fdf3041c2ecc1d98162771