[INFO] cloning repository https://github.com/xieyuheng/sicp-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xieyuheng/sicp-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxieyuheng%2Fsicp-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxieyuheng%2Fsicp-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ffadb86c09f511bcb6407a211d1798d75b5da391
[INFO] testing xieyuheng/sicp-rs against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxieyuheng%2Fsicp-rs" "/workspace/builds/worker-22/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-22/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xieyuheng/sicp-rs on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/xieyuheng/sicp-rs
[INFO] finished tweaking git repo https://github.com/xieyuheng/sicp-rs
[INFO] tweaked toml for git repo https://github.com/xieyuheng/sicp-rs written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] crate git repo https://github.com/xieyuheng/sicp-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 386ebcc0d4134a53bb0924d934260bbe07b1cd745ca3e1bd4d55b521ca2f3e33
[INFO] running `Command { std: "docker" "start" "-a" "386ebcc0d4134a53bb0924d934260bbe07b1cd745ca3e1bd4d55b521ca2f3e33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "386ebcc0d4134a53bb0924d934260bbe07b1cd745ca3e1bd4d55b521ca2f3e33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "386ebcc0d4134a53bb0924d934260bbe07b1cd745ca3e1bd4d55b521ca2f3e33", kill_on_drop: false }`
[INFO] [stdout] 386ebcc0d4134a53bb0924d934260bbe07b1cd745ca3e1bd4d55b521ca2f3e33
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c162f29f8aa854bff29c37169df539d99a4bd30e415cb039428acc792534b89a
[INFO] running `Command { std: "docker" "start" "-a" "c162f29f8aa854bff29c37169df539d99a4bd30e415cb039428acc792534b89a", kill_on_drop: false }`
[INFO] [stderr]    Compiling sicp v0.1.0 (/opt/rustwide/workdir/sicp)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> sicp/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(uniform_paths)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `uniform_paths` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> sicp/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:489:13
[INFO] [stdout]     |
[INFO] [stdout] 489 |     } else {;
[INFO] [stdout]     |             ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `uniform_paths` has been stable since 1.32.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> sicp/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(uniform_paths)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> sicp/src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(test)]
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> sicp/src/ch_1_3.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 85 -     term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout] 85 +     term: &dyn Fn (f64) -> f64, a: f64,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> sicp/src/ch_1_3.rs:86:12
[INFO] [stdout]    |
[INFO] [stdout] 86 |     next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 86 -     next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout] 86 +     next: &dyn Fn (f64) -> f64, b: f64,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:170:10
[INFO] [stdout]     |
[INFO] [stdout] 170 |     f: & Fn (f64) -> f64,
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 170 -     f: & Fn (f64) -> f64,
[INFO] [stdout] 170 +     f: & dyn Fn (f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:261:13
[INFO] [stdout]     |
[INFO] [stdout] 261 |     term: & Fn (f64) -> f64, a: f64,
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 261 -     term: & Fn (f64) -> f64, a: f64,
[INFO] [stdout] 261 +     term: & dyn Fn (f64) -> f64, a: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:262:13
[INFO] [stdout]     |
[INFO] [stdout] 262 |     next: & Fn (f64) -> f64, b: f64,
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 262 -     next: & Fn (f64) -> f64, b: f64,
[INFO] [stdout] 262 +     next: & dyn Fn (f64) -> f64, b: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:290:16
[INFO] [stdout]     |
[INFO] [stdout] 290 |     combiner: &Fn (f64, f64) -> f64,
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 290 -     combiner: &Fn (f64, f64) -> f64,
[INFO] [stdout] 290 +     combiner: &dyn Fn (f64, f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:292:12
[INFO] [stdout]     |
[INFO] [stdout] 292 |     term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 292 -     term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout] 292 +     term: &dyn Fn (f64) -> f64, a: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:293:12
[INFO] [stdout]     |
[INFO] [stdout] 293 |     next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 293 -     next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout] 293 +     next: &dyn Fn (f64) -> f64, b: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:368:16
[INFO] [stdout]     |
[INFO] [stdout] 368 |     combiner: &Fn (f64, f64) -> f64,
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 368 -     combiner: &Fn (f64, f64) -> f64,
[INFO] [stdout] 368 +     combiner: &dyn Fn (f64, f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:370:12
[INFO] [stdout]     |
[INFO] [stdout] 370 |     term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 370 -     term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout] 370 +     term: &dyn Fn (f64) -> f64, a: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:371:12
[INFO] [stdout]     |
[INFO] [stdout] 371 |     next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 371 -     next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout] 371 +     next: &dyn Fn (f64) -> f64, b: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:372:14
[INFO] [stdout]     |
[INFO] [stdout] 372 |     filter: &Fn (f64) -> bool,
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 372 -     filter: &Fn (f64) -> bool,
[INFO] [stdout] 372 +     filter: &dyn Fn (f64) -> bool,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:455:9
[INFO] [stdout]     |
[INFO] [stdout] 455 |     f: &Fn (f64) -> f64,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 455 -     f: &Fn (f64) -> f64,
[INFO] [stdout] 455 +     f: &dyn Fn (f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:479:9
[INFO] [stdout]     |
[INFO] [stdout] 479 |     f: &Fn (f64) -> f64,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 479 -     f: &Fn (f64) -> f64,
[INFO] [stdout] 479 +     f: &dyn Fn (f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:515:9
[INFO] [stdout]     |
[INFO] [stdout] 515 |     f: &Fn (f64) -> f64,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 515 -     f: &Fn (f64) -> f64,
[INFO] [stdout] 515 +     f: &dyn Fn (f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:523:13
[INFO] [stdout]     |
[INFO] [stdout] 523 |         f: &Fn (f64) -> f64,
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 523 -         f: &Fn (f64) -> f64,
[INFO] [stdout] 523 +         f: &dyn Fn (f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:144:14
[INFO] [stdout]     |
[INFO] [stdout] 144 |         f: & Fn (f64) -> f64,
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 144 -         f: & Fn (f64) -> f64,
[INFO] [stdout] 144 +         f: & dyn Fn (f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:224:17
[INFO] [stdout]     |
[INFO] [stdout] 224 |         term: & Fn (f64) -> f64, a: f64,
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 224 -         term: & Fn (f64) -> f64, a: f64,
[INFO] [stdout] 224 +         term: & dyn Fn (f64) -> f64, a: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:225:17
[INFO] [stdout]     |
[INFO] [stdout] 225 |         next: & Fn (f64) -> f64, b: f64,
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 225 -         next: & Fn (f64) -> f64, b: f64,
[INFO] [stdout] 225 +         next: & dyn Fn (f64) -> f64, b: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:239:17
[INFO] [stdout]     |
[INFO] [stdout] 239 |         term: & Fn (f64) -> f64, a: f64,
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 239 -         term: & Fn (f64) -> f64, a: f64,
[INFO] [stdout] 239 +         term: & dyn Fn (f64) -> f64, a: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:240:17
[INFO] [stdout]     |
[INFO] [stdout] 240 |         next: & Fn (f64) -> f64, b: f64,
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 240 -         next: & Fn (f64) -> f64, b: f64,
[INFO] [stdout] 240 +         next: & dyn Fn (f64) -> f64, b: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:323:16
[INFO] [stdout]     |
[INFO] [stdout] 323 |         term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 323 -         term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout] 323 +         term: &dyn Fn (f64) -> f64, a: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:324:16
[INFO] [stdout]     |
[INFO] [stdout] 324 |         next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 324 -         next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout] 324 +         next: &dyn Fn (f64) -> f64, b: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:330:16
[INFO] [stdout]     |
[INFO] [stdout] 330 |         term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 330 -         term: &Fn (f64) -> f64, a: f64,
[INFO] [stdout] 330 +         term: &dyn Fn (f64) -> f64, a: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:331:16
[INFO] [stdout]     |
[INFO] [stdout] 331 |         next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 331 -         next: &Fn (f64) -> f64, b: f64,
[INFO] [stdout] 331 +         next: &dyn Fn (f64) -> f64, b: f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> sicp/src/ch_1_3.rs:426:14
[INFO] [stdout]     |
[INFO] [stdout] 426 |         f: & Fn (f64) -> f64,
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) 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] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 426 -         f: & Fn (f64) -> f64,
[INFO] [stdout] 426 +         f: & dyn Fn (f64) -> f64,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sicp` due to 4 previous errors; 28 warnings emitted
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "c162f29f8aa854bff29c37169df539d99a4bd30e415cb039428acc792534b89a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c162f29f8aa854bff29c37169df539d99a4bd30e415cb039428acc792534b89a", kill_on_drop: false }`
[INFO] [stdout] c162f29f8aa854bff29c37169df539d99a4bd30e415cb039428acc792534b89a