[INFO] cloning repository https://github.com/maxastyler/Spirograph
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/maxastyler/Spirograph" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxastyler%2FSpirograph", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxastyler%2FSpirograph'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d639d179214179e4843bca5cbd646dc9a1959e5d
[INFO] checking maxastyler/Spirograph against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxastyler%2FSpirograph" "/workspace/builds/worker-30/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-30/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/maxastyler/Spirograph on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/maxastyler/Spirograph
[INFO] finished tweaking git repo https://github.com/maxastyler/Spirograph
[INFO] tweaked toml for git repo https://github.com/maxastyler/Spirograph written to /workspace/builds/worker-30/source/Cargo.toml
[INFO] crate git repo https://github.com/maxastyler/Spirograph already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded inflate v0.3.3
[INFO] [stderr]   Downloaded either v1.4.0
[INFO] [stderr]   Downloaded scoped_threadpool v0.1.8
[INFO] [stderr]   Downloaded rand v0.3.20
[INFO] [stderr]   Downloaded rayon-core v1.3.0
[INFO] [stderr]   Downloaded deflate v0.7.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cc6a83eac5c6f033fe374b1fd55da599570914711801f348c1764c6153647e36
[INFO] running `Command { std: "docker" "start" "-a" "cc6a83eac5c6f033fe374b1fd55da599570914711801f348c1764c6153647e36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cc6a83eac5c6f033fe374b1fd55da599570914711801f348c1764c6153647e36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc6a83eac5c6f033fe374b1fd55da599570914711801f348c1764c6153647e36", kill_on_drop: false }`
[INFO] [stdout] cc6a83eac5c6f033fe374b1fd55da599570914711801f348c1764c6153647e36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1b4683dce336d89d3284e7f580dbed92a2f46faadb28f898dcb9fd9e115e31aa
[INFO] running `Command { std: "docker" "start" "-a" "1b4683dce336d89d3284e7f580dbed92a2f46faadb28f898dcb9fd9e115e31aa", kill_on_drop: false }`
[INFO] [stderr]     Checking num-traits v0.1.42
[INFO] [stderr]     Checking libc v0.2.36
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking either v1.4.0
[INFO] [stderr]    Compiling rayon-core v1.3.0
[INFO] [stderr]     Checking adler32 v1.0.2
[INFO] [stderr]     Checking lzw v0.10.0
[INFO] [stderr]     Checking color_quant v1.0.0
[INFO] [stderr]     Checking scoped_threadpool v0.1.8
[INFO] [stderr]     Checking deflate v0.7.17
[INFO] [stderr]     Checking inflate v0.3.3
[INFO] [stderr]     Checking gif v0.9.2
[INFO] [stderr]     Checking coco v0.1.1
[INFO] [stderr]     Checking rand v0.3.20
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking num-integer v0.1.35
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking num-iter v0.1.34
[INFO] [stderr]     Checking num-rational v0.1.40
[INFO] [stderr]     Checking png v0.11.0
[INFO] [stderr]     Checking rayon v0.8.2
[INFO] [stderr]     Checking jpeg-decoder v0.1.13
[INFO] [stderr]     Checking image v0.18.0
[INFO] [stderr]     Checking spirograph v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:21:15
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn normal(f: &Fn(f64) -> (f64, f64), dx: f64, t: f64) -> (f64, f64) {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> (f64, f64)`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:21:15
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn normal(f: &Fn(f64) -> (f64, f64), dx: f64, t: f64) -> (f64, f64) {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> (f64, f64)`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:34:32
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn gen_envelope(h: f64) -> Box<Fn(f64) -> f64> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> f64`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:34:32
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn gen_envelope(h: f64) -> Box<Fn(f64) -> f64> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> f64`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:40:35
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn double_envelope(h: f64) -> Box<Fn(f64) -> f64> {
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> f64`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:40:35
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn double_envelope(h: f64) -> Box<Fn(f64) -> f64> {
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> f64`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:46:32
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn envelope_path<'a>(path: &'a Fn(f64) -> (f64, f64), envelope: Box<Fn(f64) -> f64 + 'a>) -> Box<Fn(f64) -> (f64, f64) + 'a> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> (f64, f64)`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:46:32
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn envelope_path<'a>(path: &'a Fn(f64) -> (f64, f64), envelope: Box<Fn(f64) -> f64 + 'a>) -> Box<Fn(f64) -> (f64, f64) + 'a> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> (f64, f64)`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:46:69
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn envelope_path<'a>(path: &'a Fn(f64) -> (f64, f64), envelope: Box<Fn(f64) -> f64 + 'a>) -> Box<Fn(f64) -> (f64, f64) + 'a> {
[INFO] [stdout]    |                                                                     ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> f64 + 'a`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:46:69
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn envelope_path<'a>(path: &'a Fn(f64) -> (f64, f64), envelope: Box<Fn(f64) -> f64 + 'a>) -> Box<Fn(f64) -> (f64, f64) + 'a> {
[INFO] [stdout]    |                                                                     ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> f64 + 'a`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:46:98
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn envelope_path<'a>(path: &'a Fn(f64) -> (f64, f64), envelope: Box<Fn(f64) -> f64 + 'a>) -> Box<Fn(f64) -> (f64, f64) + 'a> {
[INFO] [stdout]    |                                                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> (f64, f64) + 'a`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:46:98
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn envelope_path<'a>(path: &'a Fn(f64) -> (f64, f64), envelope: Box<Fn(f64) -> f64 + 'a>) -> Box<Fn(f64) -> (f64, f64) + 'a> {
[INFO] [stdout]    |                                                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> (f64, f64) + 'a`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:64:91
[INFO] [stdout]    |
[INFO] [stdout] 64 | ...>, path_points: Vec<f64>, path: & Fn(f64) -> (f64, f64), envelope_generator: &Fn(f64) -> Box<Fn(f64) -> f64>) -> image::ImageBuffer<im...
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> (f64, f64)`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:64:91
[INFO] [stdout]    |
[INFO] [stdout] 64 | ...>, path_points: Vec<f64>, path: & Fn(f64) -> (f64, f64), envelope_generator: &Fn(f64) -> Box<Fn(f64) -> f64>) -> image::ImageBuffer<im...
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> (f64, f64)`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:64:135
[INFO] [stdout]    |
[INFO] [stdout] 64 | ...4), envelope_generator: &Fn(f64) -> Box<Fn(f64) -> f64>) -> image::ImageBuffer<image::Luma<u8>, std::vec::Vec<u8>> {
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> Box<Fn(f64) -> f64>`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:64:150
[INFO] [stdout]    |
[INFO] [stdout] 64 | ...64), envelope_generator: &Fn(f64) -> Box<Fn(f64) -> f64>) -> image::ImageBuffer<image::Luma<u8>, std::vec::Vec<u8>> {
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> f64`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:64:135
[INFO] [stdout]    |
[INFO] [stdout] 64 | ...4), envelope_generator: &Fn(f64) -> Box<Fn(f64) -> f64>) -> image::ImageBuffer<image::Luma<u8>, std::vec::Vec<u8>> {
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> Box<Fn(f64) -> f64>`
[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: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:64:150
[INFO] [stdout]    |
[INFO] [stdout] 64 | ...64), envelope_generator: &Fn(f64) -> Box<Fn(f64) -> f64>) -> image::ImageBuffer<image::Luma<u8>, std::vec::Vec<u8>> {
[INFO] [stdout]    |                                             ^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(f64) -> f64`
[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: function is never used: `path`
[INFO] [stdout]  --> src/main.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn path(t: f64) -> (f64, f64) {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `path`
[INFO] [stdout]  --> src/main.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn path(t: f64) -> (f64, f64) {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `envelope`
[INFO] [stdout]   --> src/main.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn envelope(t: f64) -> f64 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `envelope`
[INFO] [stdout]   --> src/main.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn envelope(t: f64) -> f64 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `double_envelope`
[INFO] [stdout]   --> src/main.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn double_envelope(h: f64) -> Box<Fn(f64) -> f64> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `double_envelope`
[INFO] [stdout]   --> src/main.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn double_envelope(h: f64) -> Box<Fn(f64) -> f64> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 43.99s
[INFO] running `Command { std: "docker" "inspect" "1b4683dce336d89d3284e7f580dbed92a2f46faadb28f898dcb9fd9e115e31aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b4683dce336d89d3284e7f580dbed92a2f46faadb28f898dcb9fd9e115e31aa", kill_on_drop: false }`
[INFO] [stdout] 1b4683dce336d89d3284e7f580dbed92a2f46faadb28f898dcb9fd9e115e31aa