[INFO] fetching crate suppositions 0.1.4...
[INFO] checking suppositions-0.1.4 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate suppositions 0.1.4 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate suppositions 0.1.4 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate suppositions 0.1.4
[INFO] finished tweaking crates.io crate suppositions 0.1.4
[INFO] tweaked toml for crates.io crate suppositions 0.1.4 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 23 packages
[INFO] [stderr]       Adding aho-corasick v0.6.10 (latest: v1.1.3)
[INFO] [stderr]       Adding env_logger v0.4.3 (latest: v0.11.3)
[INFO] [stderr]       Adding log v0.3.9 (latest: v0.4.21)
[INFO] [stderr]       Adding rand v0.3.23 (latest: v0.8.5)
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[INFO] [stderr]       Adding rand_core v0.3.1 (latest: v0.6.4)
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[INFO] [stderr]       Adding regex-syntax v0.5.6 (latest: v0.8.3)
[INFO] [stderr]       Adding thread_local v0.3.6 (latest: v1.1.8)
[INFO] [stderr]       Adding ucd-util v0.1.10 (latest: v0.2.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hex-slice v0.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 58344fa56967f1dbfbf08340d957c50d7c2e62ab7c984d02c2f84e32dfd513d6
[INFO] running `Command { std: "docker" "start" "-a" "58344fa56967f1dbfbf08340d957c50d7c2e62ab7c984d02c2f84e32dfd513d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "58344fa56967f1dbfbf08340d957c50d7c2e62ab7c984d02c2f84e32dfd513d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58344fa56967f1dbfbf08340d957c50d7c2e62ab7c984d02c2f84e32dfd513d6", kill_on_drop: false }`
[INFO] [stdout] 58344fa56967f1dbfbf08340d957c50d7c2e62ab7c984d02c2f84e32dfd513d6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 320965cd80130d778dae39c998ccb5d0e1e28fe95e0a895db169717ec367da04
[INFO] running `Command { std: "docker" "start" "-a" "320965cd80130d778dae39c998ccb5d0e1e28fe95e0a895db169717ec367da04", kill_on_drop: false }`
[INFO] [stderr]     Checking ucd-util v0.1.10
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking utf8-ranges v1.0.5
[INFO] [stderr]     Checking hex-slice v0.1.4
[INFO] [stderr]     Checking suppositions v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:157:38
[INFO] [stdout]     |
[INFO] [stdout] 157 |     fn generate_obj(&self, src: &mut Iterator<Item = u8>) -> Maybe<Self::Item>;
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 157 |     fn generate_obj(&self, src: &mut dyn Iterator<Item = u8>) -> Maybe<Self::Item>;
[INFO] [stdout]     |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:167:27
[INFO] [stdout]     |
[INFO] [stdout] 167 |     fn boxed(self) -> Box<GeneratorObject<Item = Self::Item>>;
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 167 |     fn boxed(self) -> Box<dyn GeneratorObject<Item = Self::Item>>;
[INFO] [stdout]     |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:175:27
[INFO] [stdout]     |
[INFO] [stdout] 175 |     fn boxed(self) -> Box<GeneratorObject<Item = Self::Item>> {
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 175 |     fn boxed(self) -> Box<dyn GeneratorObject<Item = Self::Item>> {
[INFO] [stdout]     |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:182:42
[INFO] [stdout]     |
[INFO] [stdout] 182 |     fn generate_obj(&self, mut src: &mut Iterator<Item = u8>) -> Maybe<Self::Item> {
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 182 |     fn generate_obj(&self, mut src: &mut dyn Iterator<Item = u8>) -> Maybe<Self::Item> {
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:187:27
[INFO] [stdout]     |
[INFO] [stdout] 187 | impl<T> Generator for Box<GeneratorObject<Item = T>> {
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 187 | impl<T> Generator for Box<dyn GeneratorObject<Item = T>> {
[INFO] [stdout]     |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:190:43
[INFO] [stdout]     |
[INFO] [stdout] 190 |         (**self).generate_obj(src as &mut Iterator<Item = u8>)
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 190 |         (**self).generate_obj(src as &mut dyn Iterator<Item = u8>)
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> tests/smoketest.rs:57:14
[INFO] [stdout]    |
[INFO] [stdout] 57 |     property((booleans())).check(|_| false)
[INFO] [stdout]    |              ^          ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 57 -     property((booleans())).check(|_| false)
[INFO] [stdout] 57 +     property(booleans()).check(|_| false)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> tests/smoketest.rs:62:14
[INFO] [stdout]    |
[INFO] [stdout] 62 |     property((booleans())).check(|_| true)
[INFO] [stdout]    |              ^          ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 62 -     property((booleans())).check(|_| true)
[INFO] [stdout] 62 +     property(booleans()).check(|_| true)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> tests/smoketest.rs:77:14
[INFO] [stdout]    |
[INFO] [stdout] 77 |     property((booleans())).check(|_| -> Result<(), ()> { Err(()) })
[INFO] [stdout]    |              ^          ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 77 -     property((booleans())).check(|_| -> Result<(), ()> { Err(()) })
[INFO] [stdout] 77 +     property(booleans()).check(|_| -> Result<(), ()> { Err(()) })
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> tests/smoketest.rs:83:14
[INFO] [stdout]    |
[INFO] [stdout] 83 |     property((booleans())).check(|_| -> Result<(), &'static str> { Err("horrible failure") })
[INFO] [stdout]    |              ^          ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 83 -     property((booleans())).check(|_| -> Result<(), &'static str> { Err("horrible failure") })
[INFO] [stdout] 83 +     property(booleans()).check(|_| -> Result<(), &'static str> { Err("horrible failure") })
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> tests/smoketest.rs:89:14
[INFO] [stdout]    |
[INFO] [stdout] 89 |     property((booleans())).check(|_| -> Result<(), ()> { Ok(()) })
[INFO] [stdout]    |              ^          ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 89 -     property((booleans())).check(|_| -> Result<(), ()> { Ok(()) })
[INFO] [stdout] 89 +     property(booleans()).check(|_| -> Result<(), ()> { Ok(()) })
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> tests/smoketest.rs:95:14
[INFO] [stdout]    |
[INFO] [stdout] 95 |     property((booleans())).check(|_| -> () { panic!("Big bad boom") })
[INFO] [stdout]    |              ^          ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 95 -     property((booleans())).check(|_| -> () { panic!("Big bad boom") })
[INFO] [stdout] 95 +     property(booleans()).check(|_| -> () { panic!("Big bad boom") })
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]    --> tests/smoketest.rs:101:14
[INFO] [stdout]     |
[INFO] [stdout] 101 |     property((booleans())).check(|_| -> () { panic!("Big bad boom") })
[INFO] [stdout]     |              ^          ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 101 -     property((booleans())).check(|_| -> () { panic!("Big bad boom") })
[INFO] [stdout] 101 +     property(booleans()).check(|_| -> () { panic!("Big bad boom") })
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> examples/die-hard.rs:70:17
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn ops() -> Box<GeneratorObject<Item = Op>> {
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn ops() -> Box<dyn GeneratorObject<Item = Op>> {
[INFO] [stdout]    |                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `iter` is imported redundantly
[INFO] [stdout]    --> src/generators.rs:713:9
[INFO] [stdout]     |
[INFO] [stdout] 713 |     use std::iter;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 716 |     use super::*;
[INFO] [stdout]     |         -------- the item `iter` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `InfoPool` is imported redundantly
[INFO] [stdout]    --> src/generators.rs:717:9
[INFO] [stdout]     |
[INFO] [stdout] 716 |     use super::*;
[INFO] [stdout]     |         -------- the item `InfoPool` is already imported here
[INFO] [stdout] 717 |     use data::InfoPool;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `BTreeMap` is imported redundantly
[INFO] [stdout]     --> src/generators.rs:1080:13
[INFO] [stdout]      |
[INFO] [stdout] 1079 |         use super::*;
[INFO] [stdout]      |             -------- the item `BTreeMap` is already imported here
[INFO] [stdout] 1080 |         use std::collections::BTreeMap;
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `BTreeMap` is imported redundantly
[INFO] [stdout]     --> src/generators.rs:1137:32
[INFO] [stdout]      |
[INFO] [stdout] 1136 |         use super::*;
[INFO] [stdout]      |             -------- the item `BTreeMap` is already imported here
[INFO] [stdout] 1137 |         use std::collections::{BTreeMap, LinkedList};
[INFO] [stdout]      |                                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> tests/recursive.rs:36:22
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn expr_gen() -> Box<GeneratorObject<Item=Expr>> {
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn expr_gen() -> Box<dyn GeneratorObject<Item=Expr>> {
[INFO] [stdout]    |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:157:38
[INFO] [stdout]     |
[INFO] [stdout] 157 |     fn generate_obj(&self, src: &mut Iterator<Item = u8>) -> Maybe<Self::Item>;
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 157 |     fn generate_obj(&self, src: &mut dyn Iterator<Item = u8>) -> Maybe<Self::Item>;
[INFO] [stdout]     |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:167:27
[INFO] [stdout]     |
[INFO] [stdout] 167 |     fn boxed(self) -> Box<GeneratorObject<Item = Self::Item>>;
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 167 |     fn boxed(self) -> Box<dyn GeneratorObject<Item = Self::Item>>;
[INFO] [stdout]     |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:175:27
[INFO] [stdout]     |
[INFO] [stdout] 175 |     fn boxed(self) -> Box<GeneratorObject<Item = Self::Item>> {
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 175 |     fn boxed(self) -> Box<dyn GeneratorObject<Item = Self::Item>> {
[INFO] [stdout]     |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:182:42
[INFO] [stdout]     |
[INFO] [stdout] 182 |     fn generate_obj(&self, mut src: &mut Iterator<Item = u8>) -> Maybe<Self::Item> {
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 182 |     fn generate_obj(&self, mut src: &mut dyn Iterator<Item = u8>) -> Maybe<Self::Item> {
[INFO] [stdout]     |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:187:27
[INFO] [stdout]     |
[INFO] [stdout] 187 | impl<T> Generator for Box<GeneratorObject<Item = T>> {
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 187 | impl<T> Generator for Box<dyn GeneratorObject<Item = T>> {
[INFO] [stdout]     |                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/data.rs:321:17
[INFO] [stdout]     |
[INFO] [stdout] 321 |         let _: &Iterator<Item = u8> = &p.replay();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 321 |         let _: &dyn Iterator<Item = u8> = &p.replay();
[INFO] [stdout]     |                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/data.rs:330:17
[INFO] [stdout]     |
[INFO] [stdout] 330 |         let _: &Iterator<Item = u8> = &p.replay();
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 330 |         let _: &dyn Iterator<Item = u8> = &p.replay();
[INFO] [stdout]     |                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/generators.rs:190:43
[INFO] [stdout]     |
[INFO] [stdout] 190 |         (**self).generate_obj(src as &mut Iterator<Item = u8>)
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 190 |         (**self).generate_obj(src as &mut dyn Iterator<Item = u8>)
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.22s
[INFO] running `Command { std: "docker" "inspect" "320965cd80130d778dae39c998ccb5d0e1e28fe95e0a895db169717ec367da04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "320965cd80130d778dae39c998ccb5d0e1e28fe95e0a895db169717ec367da04", kill_on_drop: false }`
[INFO] [stdout] 320965cd80130d778dae39c998ccb5d0e1e28fe95e0a895db169717ec367da04