[INFO] fetching crate len_constraints 0.1.2...
[INFO] testing len_constraints-0.1.2 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145330-1
[INFO] extracting crate len_constraints 0.1.2 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate len_constraints 0.1.2
[INFO] finished tweaking crates.io crate len_constraints 0.1.2
[INFO] tweaked toml for crates.io crate len_constraints 0.1.2 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate len_constraints 0.1.2 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0dd30e021082b4d2c9e8567a3e21719dc0482f52731cf6de29c1137fcadfbcb7
[INFO] running `Command { std: "docker" "start" "-a" "0dd30e021082b4d2c9e8567a3e21719dc0482f52731cf6de29c1137fcadfbcb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0dd30e021082b4d2c9e8567a3e21719dc0482f52731cf6de29c1137fcadfbcb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0dd30e021082b4d2c9e8567a3e21719dc0482f52731cf6de29c1137fcadfbcb7", kill_on_drop: false }`
[INFO] [stdout] 0dd30e021082b4d2c9e8567a3e21719dc0482f52731cf6de29c1137fcadfbcb7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b07c1493c3d54de1f66fb30e5c2c9aca8955a1e5a43a2304bc29d4b38a6787d3
[INFO] running `Command { std: "docker" "start" "-a" "b07c1493c3d54de1f66fb30e5c2c9aca8955a1e5a43a2304bc29d4b38a6787d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling len_constraints v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:48:51
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:41:51
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>>;
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:57:51
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:66:51
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:75:51
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:100:73
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn try_from(slice: &'a[T], relative_to: usize) -> Result<Self, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn try_from(slice: &'a[T], relative_to: usize) -> Result<Self, Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:107:63
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:113:64
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:124:77
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn try_from(slice: &'a mut[T], relative_to: usize) -> Result<Self, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn try_from(slice: &'a mut[T], relative_to: usize) -> Result<Self, Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:131:63
[INFO] [stdout]     |
[INFO] [stdout] 131 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 131 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:137:71
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub fn slice_mut(self, relative_to: usize) -> Result<&'a mut[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub fn slice_mut(self, relative_to: usize) -> Result<&'a mut[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:143:64
[INFO] [stdout]     |
[INFO] [stdout] 143 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 143 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice.rs:57:19
[INFO] [stdout]    |
[INFO] [stdout] 57 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 57 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice.rs:76:19
[INFO] [stdout]    |
[INFO] [stdout] 76 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 76 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice_mut.rs:81:19
[INFO] [stdout]    |
[INFO] [stdout] 81 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 81 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:100:19
[INFO] [stdout]     |
[INFO] [stdout] 100 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 100 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]     |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s
[INFO] running `Command { std: "docker" "inspect" "b07c1493c3d54de1f66fb30e5c2c9aca8955a1e5a43a2304bc29d4b38a6787d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b07c1493c3d54de1f66fb30e5c2c9aca8955a1e5a43a2304bc29d4b38a6787d3", kill_on_drop: false }`
[INFO] [stdout] b07c1493c3d54de1f66fb30e5c2c9aca8955a1e5a43a2304bc29d4b38a6787d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 805eadad3b3939450047c7c5dab238b49f05f51ed7cccbe80ac80ae253e27072
[INFO] running `Command { std: "docker" "start" "-a" "805eadad3b3939450047c7c5dab238b49f05f51ed7cccbe80ac80ae253e27072", kill_on_drop: false }`
[INFO] [stderr]    Compiling len_constraints v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:48:51
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:41:51
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>>;
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:57:51
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:66:51
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:75:51
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:100:73
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn try_from(slice: &'a[T], relative_to: usize) -> Result<Self, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn try_from(slice: &'a[T], relative_to: usize) -> Result<Self, Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:107:63
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:113:64
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:124:77
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn try_from(slice: &'a mut[T], relative_to: usize) -> Result<Self, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn try_from(slice: &'a mut[T], relative_to: usize) -> Result<Self, Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:131:63
[INFO] [stdout]     |
[INFO] [stdout] 131 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 131 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:137:71
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub fn slice_mut(self, relative_to: usize) -> Result<&'a mut[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub fn slice_mut(self, relative_to: usize) -> Result<&'a mut[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:143:64
[INFO] [stdout]     |
[INFO] [stdout] 143 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 143 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice.rs:57:19
[INFO] [stdout]    |
[INFO] [stdout] 57 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 57 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice.rs:76:19
[INFO] [stdout]    |
[INFO] [stdout] 76 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 76 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice_mut.rs:81:19
[INFO] [stdout]    |
[INFO] [stdout] 81 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 81 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:100:19
[INFO] [stdout]     |
[INFO] [stdout] 100 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 100 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]     |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:48:51
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:41:51
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>>;
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:57:51
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:66:51
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/type_math.rs:75:51
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stdout]    |                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:100:73
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn try_from(slice: &'a[T], relative_to: usize) -> Result<Self, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 100 |     pub fn try_from(slice: &'a[T], relative_to: usize) -> Result<Self, Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:107:63
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice.rs:113:64
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:124:77
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn try_from(slice: &'a mut[T], relative_to: usize) -> Result<Self, Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub fn try_from(slice: &'a mut[T], relative_to: usize) -> Result<Self, Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:131:63
[INFO] [stdout]     |
[INFO] [stdout] 131 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 131 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:137:71
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub fn slice_mut(self, relative_to: usize) -> Result<&'a mut[T], Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub fn slice_mut(self, relative_to: usize) -> Result<&'a mut[T], Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:143:64
[INFO] [stdout]     |
[INFO] [stdout] 143 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 143 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stdout]     |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice.rs:57:19
[INFO] [stdout]    |
[INFO] [stdout] 57 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 57 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice.rs:76:19
[INFO] [stdout]    |
[INFO] [stdout] 76 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 76 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/slice_mut.rs:81:19
[INFO] [stdout]    |
[INFO] [stdout] 81 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 81 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/slice_mut.rs:100:19
[INFO] [stdout]     |
[INFO] [stdout] 100 |     type Error = Box<Error + 'static>;
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 100 |     type Error = Box<dyn Error + 'static>;
[INFO] [stdout]     |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/constraint_macro.rs:10:29
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn test() -> Result<(), Box<Error + 'static>> {
[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/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn test() -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stdout]    |                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.05s
[INFO] running `Command { std: "docker" "inspect" "805eadad3b3939450047c7c5dab238b49f05f51ed7cccbe80ac80ae253e27072", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "805eadad3b3939450047c7c5dab238b49f05f51ed7cccbe80ac80ae253e27072", kill_on_drop: false }`
[INFO] [stdout] 805eadad3b3939450047c7c5dab238b49f05f51ed7cccbe80ac80ae253e27072
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4e5df30ee318832ee6772cfc292c286fc588b33701fc54b88407c8ee1608d50f
[INFO] running `Command { std: "docker" "start" "-a" "4e5df30ee318832ee6772cfc292c286fc588b33701fc54b88407c8ee1608d50f", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/type_math.rs:48:51
[INFO] [stderr]    |
[INFO] [stderr] 48 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 48 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stderr]    |                                                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/type_math.rs:41:51
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>>;
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>>;
[INFO] [stderr]    |                                                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/type_math.rs:57:51
[INFO] [stderr]    |
[INFO] [stderr] 57 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 57 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stderr]    |                                                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/type_math.rs:66:51
[INFO] [stderr]    |
[INFO] [stderr] 66 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 66 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stderr]    |                                                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/type_math.rs:75:51
[INFO] [stderr]    |
[INFO] [stderr] 75 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<Error + 'static>> {
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 75 |     fn r#do(a: usize, b: usize) -> Result<usize, Box<dyn Error + 'static>> {
[INFO] [stderr]    |                                                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/slice.rs:100:73
[INFO] [stderr]     |
[INFO] [stderr] 100 |     pub fn try_from(slice: &'a[T], relative_to: usize) -> Result<Self, Box<Error + 'static>> {
[INFO] [stderr]     |                                                                            ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 100 |     pub fn try_from(slice: &'a[T], relative_to: usize) -> Result<Self, Box<dyn Error + 'static>> {
[INFO] [stderr]     |                                                                            +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/slice.rs:107:63
[INFO] [stderr]     |
[INFO] [stderr] 107 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<Error + 'static>> {
[INFO] [stderr]     |                                                                  ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 107 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<dyn Error + 'static>> {
[INFO] [stderr]     |                                                                  +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/slice.rs:113:64
[INFO] [stderr]     |
[INFO] [stderr] 113 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<Error + 'static>> {
[INFO] [stderr]     |                                                                   ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 113 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stderr]     |                                                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/slice_mut.rs:124:77
[INFO] [stderr]     |
[INFO] [stderr] 124 |     pub fn try_from(slice: &'a mut[T], relative_to: usize) -> Result<Self, Box<Error + 'static>> {
[INFO] [stderr]     |                                                                                ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 124 |     pub fn try_from(slice: &'a mut[T], relative_to: usize) -> Result<Self, Box<dyn Error + 'static>> {
[INFO] [stderr]     |                                                                                +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/slice_mut.rs:131:63
[INFO] [stderr]     |
[INFO] [stderr] 131 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<Error + 'static>> {
[INFO] [stderr]     |                                                                  ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 131 |     pub fn slice(self, relative_to: usize) -> Result<&'a[T], Box<dyn Error + 'static>> {
[INFO] [stderr]     |                                                                  +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/slice_mut.rs:137:71
[INFO] [stderr]     |
[INFO] [stderr] 137 |     pub fn slice_mut(self, relative_to: usize) -> Result<&'a mut[T], Box<Error + 'static>> {
[INFO] [stderr]     |                                                                          ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 137 |     pub fn slice_mut(self, relative_to: usize) -> Result<&'a mut[T], Box<dyn Error + 'static>> {
[INFO] [stderr]     |                                                                          +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/slice_mut.rs:143:64
[INFO] [stderr]     |
[INFO] [stderr] 143 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<Error + 'static>> {
[INFO] [stderr]     |                                                                   ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 143 |     fn validate(len: usize, relative_to: usize) -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stderr]     |                                                                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/slice.rs:57:19
[INFO] [stderr]    |
[INFO] [stderr] 57 |     type Error = Box<Error + 'static>;
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 57 |     type Error = Box<dyn Error + 'static>;
[INFO] [stderr]    |                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/slice.rs:76:19
[INFO] [stderr]    |
[INFO] [stderr] 76 |     type Error = Box<Error + 'static>;
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 76 |     type Error = Box<dyn Error + 'static>;
[INFO] [stderr]    |                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/slice_mut.rs:81:19
[INFO] [stderr]    |
[INFO] [stderr] 81 |     type Error = Box<Error + 'static>;
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 81 |     type Error = Box<dyn Error + 'static>;
[INFO] [stderr]    |                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/slice_mut.rs:100:19
[INFO] [stderr]     |
[INFO] [stderr] 100 |     type Error = Box<Error + 'static>;
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 100 |     type Error = Box<dyn Error + 'static>;
[INFO] [stderr]     |                      +++
[INFO] [stderr] 
[INFO] [stderr] warning: `len_constraints` (lib) generated 16 warnings (run `cargo fix --lib -p len_constraints` to apply 16 suggestions)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/constraint_macro.rs:10:29
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn test() -> Result<(), Box<Error + 'static>> {
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn test() -> Result<(), Box<dyn Error + 'static>> {
[INFO] [stderr]    |                             +++
[INFO] [stderr] 
[INFO] [stderr] warning: `len_constraints` (test "constraint_macro") generated 1 warning (run `cargo fix --test "constraint_macro"` to apply 1 suggestion)
[INFO] [stderr] warning: `len_constraints` (lib test) generated 16 warnings (16 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/len_constraints-265071a7cc0a0a1f)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running tests/constraint_macro.rs (/opt/rustwide/target/debug/deps/constraint_macro-95ad30bacfd987a1)
[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] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- test stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'test' (25) panicked at tests/constraint_macro.rs:25:5:
[INFO] [stdout] assertion `left == right` failed
[INFO] [stdout]   left: "buf: RelativeMut { slice: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], constraint: PhantomData<(len_constraints::type_math::Add, len_constraints::type_math::_16)> }"
[INFO] [stdout]  right: "buf: RelativeMut { slice: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], constraint: PhantomData }"
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x64d0903a6e32 - std::backtrace_rs::backtrace::libunwind::trace::h0fb8082ca5562a61
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x64d0903a6e32 - std::backtrace_rs::backtrace::trace_unsynchronized::hfaa258994374a3cd
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x64d0903a6e32 - std::sys::backtrace::_print_fmt::h11496fe34963a885
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/sys/backtrace.rs:66:9
[INFO] [stdout]    3:     0x64d0903a6e32 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hff1a9408d012ee89
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/sys/backtrace.rs:39:26
[INFO] [stdout]    4:     0x64d0903ca80f - core::fmt::rt::Argument::fmt::hf11195b61445f5d1
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/fmt/rt.rs:173:76
[INFO] [stdout]    5:     0x64d0903ca80f - core::fmt::write::h2f1fc679f228cc52
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/fmt/mod.rs:1468:25
[INFO] [stdout]    6:     0x64d0903939f3 - std::io::default_write_fmt::h12bd533187bc883d
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x64d0903939f3 - std::io::Write::write_fmt::h926a1fdfdcb90065
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/io/mod.rs:1954:13
[INFO] [stdout]    8:     0x64d0903a6c82 - std::sys::backtrace::BacktraceLock::print::h28bfdbcac6d3828b
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/sys/backtrace.rs:42:9
[INFO] [stdout]    9:     0x64d09039219c - std::panicking::default_hook::{{closure}}::h1f968e3a24b0e3b4
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:301:27
[INFO] [stdout]   10:     0x64d090392019 - std::panicking::default_hook::h43da101644971931
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:325:9
[INFO] [stdout]   11:     0x64d09033ab5e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h4b2012949041da5d
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   12:     0x64d09033ab5e - test::test_main_with_exit_callback::{{closure}}::h53c9154cdc260357
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x64d0903927a3 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h911f2e3e7e84b764
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   14:     0x64d0903927a3 - std::panicking::panic_with_hook::hb4e916c3e65eccec
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:842:13
[INFO] [stdout]   15:     0x64d0903a680a - std::panicking::panic_handler::{{closure}}::hbff715d0475cf1bd
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:707:13
[INFO] [stdout]   16:     0x64d0903a6769 - std::sys::backtrace::__rust_end_short_backtrace::hd6f43484e45a4955
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/sys/backtrace.rs:174:18
[INFO] [stdout]   17:     0x64d090392dcd - __rustc[b29d3319de9a3146]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:698:5
[INFO] [stdout]   18:     0x64d0903d0af0 - core::panicking::panic_fmt::h5f8d281875be5ff1
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/panicking.rs:75:14
[INFO] [stdout]   19:     0x64d0903d0933 - core::panicking::assert_failed_inner::he2d6c07cd4513ee3
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/panicking.rs:448:17
[INFO] [stdout]   20:     0x64d0903340a0 - core::panicking::assert_failed::hbf44bb286a1be0f6
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/panicking.rs:403:5
[INFO] [stdout]   21:     0x64d0903320a3 - constraint_macro::test::h07c05abaa7c0efdb
[INFO] [stdout]                                at /opt/rustwide/workdir/tests/constraint_macro.rs:25:2
[INFO] [stdout]   22:     0x64d090332457 - constraint_macro::test::{{closure}}::h0b5d044c0afa36a4
[INFO] [stdout]                                at /opt/rustwide/workdir/tests/constraint_macro.rs:10:14
[INFO] [stdout]   23:     0x64d0903343f6 - core::ops::function::FnOnce::call_once::h955a3e3fdf461192
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/ops/function.rs:253:5
[INFO] [stdout]   24:     0x64d09034009b - core::ops::function::FnOnce::call_once::haf4e03bb51ef1351
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/ops/function.rs:253:5
[INFO] [stdout]   25:     0x64d09034009b - test::__rust_begin_short_backtrace::h50f5566ee84f2f21
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x64d090343295 - test::run_test_in_process::{{closure}}::heb3733b71d876eca
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x64d090343295 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::he2fe41e1b161faa9
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   28:     0x64d090343295 - std::panicking::catch_unwind::do_call::h00aa383d8fd97a09
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:590:40
[INFO] [stdout]   29:     0x64d090343295 - std::panicking::catch_unwind::he482e1914bc21641
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:553:19
[INFO] [stderr] error: test failed, to rerun pass `--test constraint_macro`
[INFO] [stdout]   30:     0x64d090343295 - std::panic::catch_unwind::h86ac9705098f4f22
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x64d090343295 - test::run_test_in_process::h636a992821e3c6aa
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x64d090343295 - test::run_test::{{closure}}::he454cc9a192df79f
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x64d090368c44 - test::run_test::{{closure}}::haec47455908dff86
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x64d090368c44 - std::sys::backtrace::__rust_begin_short_backtrace::h230785972524cdc1
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/sys/backtrace.rs:158:18
[INFO] [stdout]   35:     0x64d09034f85a - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::haa5a562db4cde838
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/thread/mod.rs:559:17
[INFO] [stdout]   36:     0x64d09034f85a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h89254f37a55d0a87
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   37:     0x64d09034f85a - std::panicking::catch_unwind::do_call::h499f5a462f019d9d
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:590:40
[INFO] [stdout]   38:     0x64d09034f85a - std::panicking::catch_unwind::h6736fbbb1a264383
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panicking.rs:553:19
[INFO] [stdout]   39:     0x64d09034f85a - std::panic::catch_unwind::h49ea7bdd1cbee572
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x64d09034f85a - std::thread::Builder::spawn_unchecked_::{{closure}}::h653dfa62acf32f5a
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/thread/mod.rs:557:30
[INFO] [stdout]   41:     0x64d09034f85a - core::ops::function::FnOnce::call_once{{vtable.shim}}::h82582a626a045a45
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/core/src/ops/function.rs:253:5
[INFO] [stdout]   42:     0x64d09037d3bf - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4ab26c07513156cc
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/alloc/src/boxed.rs:1971:9
[INFO] [stdout]   43:     0x64d09037d3bf - std::sys::pal::unix::thread::Thread::new::thread_start::h66ff1bba185a50cf
[INFO] [stdout]                                at /rustc/350d0ef0ec0493e6d21cfb265cb8211a0e74d766/library/std/src/sys/pal/unix/thread.rs:107:17
[INFO] [stdout]   44:     0x7796ea4b7aa4 - <unknown>
[INFO] [stdout]   45:     0x7796ea544a34 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     test
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4e5df30ee318832ee6772cfc292c286fc588b33701fc54b88407c8ee1608d50f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e5df30ee318832ee6772cfc292c286fc588b33701fc54b88407c8ee1608d50f", kill_on_drop: false }`
[INFO] [stdout] 4e5df30ee318832ee6772cfc292c286fc588b33701fc54b88407c8ee1608d50f