[INFO] fetching crate rss-watch 0.1.0... [INFO] checking rss-watch-0.1.0 against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248 [INFO] extracting crate rss-watch 0.1.0 into /workspace/builds/worker-4/source [INFO] validating manifest of crates.io crate rss-watch 0.1.0 on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate rss-watch 0.1.0 [INFO] finished tweaking crates.io crate rss-watch 0.1.0 [INFO] tweaked toml for crates.io crate rss-watch 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded atom_syndication v0.9.1 [INFO] [stderr] Downloaded atom_syndication v0.6.0 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] a769d875ab17a7b0ecfd8e8be5546ae96f9f84aff1f27d77f59dbe1042f51e44 [INFO] running `Command { std: "docker" "start" "-a" "a769d875ab17a7b0ecfd8e8be5546ae96f9f84aff1f27d77f59dbe1042f51e44", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "a769d875ab17a7b0ecfd8e8be5546ae96f9f84aff1f27d77f59dbe1042f51e44", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a769d875ab17a7b0ecfd8e8be5546ae96f9f84aff1f27d77f59dbe1042f51e44", kill_on_drop: false }` [INFO] [stdout] a769d875ab17a7b0ecfd8e8be5546ae96f9f84aff1f27d77f59dbe1042f51e44 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] e63d743d67b13597c914b54dd254cb559f7847e52e8dbf3bd50bb0f44f81598a [INFO] running `Command { std: "docker" "start" "-a" "e63d743d67b13597c914b54dd254cb559f7847e52e8dbf3bd50bb0f44f81598a", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.98 [INFO] [stderr] Checking cfg-if v0.1.10 [INFO] [stderr] Compiling syn v1.0.74 [INFO] [stderr] Compiling log v0.4.14 [INFO] [stderr] Compiling memchr v2.4.0 [INFO] [stderr] Checking lazy_static v1.4.0 [INFO] [stderr] Checking either v1.6.1 [INFO] [stderr] Checking itoa v0.4.7 [INFO] [stderr] Compiling serde v1.0.126 [INFO] [stderr] Compiling fnv v1.0.7 [INFO] [stderr] Compiling strsim v0.9.3 [INFO] [stderr] Compiling ident_case v1.0.1 [INFO] [stderr] Compiling unicode-xid v0.0.4 [INFO] [stderr] Compiling quote v0.3.15 [INFO] [stderr] Compiling derive_builder v0.9.0 [INFO] [stderr] Checking once_cell v1.8.0 [INFO] [stderr] Compiling derive_builder v0.5.1 [INFO] [stderr] Checking unicode-width v0.1.8 [INFO] [stderr] Checking linked-hash-map v0.5.4 [INFO] [stderr] Checking termcolor v1.1.2 [INFO] [stderr] Compiling num-traits v0.2.14 [INFO] [stderr] Compiling indexmap v1.7.0 [INFO] [stderr] Compiling num-integer v0.1.44 [INFO] [stderr] Compiling unicase v2.6.0 [INFO] [stderr] Compiling libsqlite3-sys v0.11.1 [INFO] [stderr] Checking app_dirs v1.2.1 [INFO] [stderr] Compiling openssl-sys v0.9.65 [INFO] [stderr] Checking encoding_rs v0.8.28 [INFO] [stderr] Checking crc32fast v1.2.1 [INFO] [stderr] Compiling hyper v0.12.36 [INFO] [stderr] Checking publicsuffix v1.5.6 [INFO] [stderr] Compiling openssl v0.10.35 [INFO] [stderr] Compiling native-tls v0.2.7 [INFO] [stderr] Checking try_from v0.3.2 [INFO] [stderr] Checking crossbeam-utils v0.7.2 [INFO] [stderr] Compiling synom v0.11.3 [INFO] [stderr] Checking lru-cache v0.1.2 [INFO] [stderr] Compiling syn v0.11.11 [INFO] [stderr] Checking tokio-executor v0.1.10 [INFO] [stderr] Checking crossbeam-epoch v0.8.2 [INFO] [stderr] Checking crossbeam-queue v0.2.3 [INFO] [stderr] Checking want v0.2.0 [INFO] [stderr] Compiling mime_guess v2.0.3 [INFO] [stderr] Checking crossbeam-deque v0.7.3 [INFO] [stderr] Checking tokio-timer v0.2.13 [INFO] [stderr] Checking tokio-current-thread v0.1.7 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking time v0.1.44 [INFO] [stderr] Checking num_cpus v1.13.0 [INFO] [stderr] Checking net2 v0.2.37 [INFO] [stderr] Checking parking_lot_core v0.6.2 [INFO] [stderr] Checking rand_os v0.1.3 [INFO] [stderr] Checking term_size v0.3.2 [INFO] [stderr] Checking atty v0.2.14 [INFO] [stderr] Checking flate2 v1.0.20 [INFO] [stderr] Checking object v0.25.3 [INFO] [stderr] Checking aho-corasick v0.7.18 [INFO] [stderr] Checking textwrap v0.11.0 [INFO] [stderr] Checking tokio-threadpool v0.1.18 [INFO] [stderr] Checking futures-cpupool v0.1.8 [INFO] [stderr] Checking bytes v0.4.12 [INFO] [stderr] Checking chrono v0.4.19 [INFO] [stderr] Checking cookie v0.12.0 [INFO] [stderr] Checking rusqlite v0.16.0 [INFO] [stderr] Checking rand v0.6.5 [INFO] [stderr] Checking clap v2.33.3 [INFO] [stderr] Checking quick-xml v0.20.0 [INFO] [stderr] Checking mio v0.6.23 [INFO] [stderr] Checking parking_lot v0.9.0 [INFO] [stderr] Checking tokio-io v0.1.13 [INFO] [stderr] Checking http v0.1.21 [INFO] [stderr] Checking tokio-buf v0.1.1 [INFO] [stderr] Checking string v0.2.1 [INFO] [stderr] Compiling derive_builder_core v0.2.0 [INFO] [stderr] Checking regex v1.5.4 [INFO] [stderr] Checking diligent-date-parser v0.1.2 [INFO] [stderr] Checking tokio-reactor v0.1.12 [INFO] [stderr] Checking uuid v0.7.4 [INFO] [stderr] Checking tokio-tcp v0.1.4 [INFO] [stderr] Checking tokio v0.1.22 [INFO] [stderr] Checking env_logger v0.6.2 [INFO] [stderr] Checking http-body v0.1.0 [INFO] [stderr] Checking h2 v0.1.26 [INFO] [stderr] Checking backtrace v0.3.60 [INFO] [stderr] Compiling synstructure v0.12.5 [INFO] [stderr] Compiling darling_core v0.10.2 [INFO] [stderr] Checking hyper-tls v0.3.2 [INFO] [stderr] Compiling serde_derive v1.0.126 [INFO] [stderr] Compiling failure_derive v0.1.8 [INFO] [stderr] Compiling darling_macro v0.10.2 [INFO] [stderr] Checking failure v0.1.8 [INFO] [stderr] Checking quick-xml v0.12.4 [INFO] [stderr] Compiling darling v0.10.2 [INFO] [stderr] Compiling derive_builder_core v0.9.0 [INFO] [stderr] Checking atom_syndication v0.9.1 [INFO] [stderr] Checking rss v1.10.0 [INFO] [stderr] Checking serde_json v1.0.64 [INFO] [stderr] Checking serde_urlencoded v0.5.5 [INFO] [stderr] Checking atom_syndication v0.6.0 [INFO] [stderr] Checking cookie_store v0.7.0 [INFO] [stderr] Checking reqwest v0.9.24 [INFO] [stderr] Checking rss-watch v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/database.rs:35:36 [INFO] [stdout] | [INFO] [stdout] 35 | &[&feed_url, &kind as &ToSql], [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn ToSql` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/database.rs:66:46 [INFO] [stdout] | [INFO] [stdout] 66 | match stmt.exists(&[&feed_id as &ToSql, guid]) { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn ToSql` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/database.rs:81:28 [INFO] [stdout] | [INFO] [stdout] 81 | &[&feed_id as &ToSql, &guid], [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn ToSql` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:124:27 [INFO] [stdout] | [INFO] [stdout] 124 | entries: &'a [&'a FeedExt], [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:125:22 [INFO] [stdout] | [INFO] [stdout] 125 | ) -> Result, Error> { [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:132:31 [INFO] [stdout] | [INFO] [stdout] 132 | let new_entries: Vec<&FeedExt> = entries [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:143:29 [INFO] [stdout] | [INFO] [stdout] 143 | .collect::>(); [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:136:54 [INFO] [stdout] | [INFO] [stdout] 136 | |e| match stmt.exists(&[&feed_id as &ToSql, &e.guid().unwrap()]) { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn ToSql` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:158:27 [INFO] [stdout] | [INFO] [stdout] 158 | let entries: Vec<&FeedExt> = match &feed { [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:159:70 [INFO] [stdout] | [INFO] [stdout] 159 | Ok(Feed::Rss(feed)) => feed.items().iter().map(|i| i as &FeedExt).collect(), [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:160:73 [INFO] [stdout] | [INFO] [stdout] 160 | Ok(Feed::Atom(feed)) => feed.entries().iter().map(|i| i as &FeedExt).collect(), [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/database.rs:35:36 [INFO] [stdout] | [INFO] [stdout] 35 | &[&feed_url, &kind as &ToSql], [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn ToSql` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stdout] = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021! [INFO] [stdout] = note: for more information, see issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/database.rs:66:46 [INFO] [stdout] | [INFO] [stdout] 66 | match stmt.exists(&[&feed_id as &ToSql, guid]) { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn ToSql` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/database.rs:81:28 [INFO] [stdout] | [INFO] [stdout] 81 | &[&feed_id as &ToSql, &guid], [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn ToSql` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:124:27 [INFO] [stdout] | [INFO] [stdout] 124 | entries: &'a [&'a FeedExt], [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:125:22 [INFO] [stdout] | [INFO] [stdout] 125 | ) -> Result, Error> { [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:132:31 [INFO] [stdout] | [INFO] [stdout] 132 | let new_entries: Vec<&FeedExt> = entries [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:143:29 [INFO] [stdout] | [INFO] [stdout] 143 | .collect::>(); [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:136:54 [INFO] [stdout] | [INFO] [stdout] 136 | |e| match stmt.exists(&[&feed_id as &ToSql, &e.guid().unwrap()]) { [INFO] [stdout] | ^^^^^ help: use `dyn`: `dyn ToSql` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:158:27 [INFO] [stdout] | [INFO] [stdout] 158 | let entries: Vec<&FeedExt> = match &feed { [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:159:70 [INFO] [stdout] | [INFO] [stdout] 159 | Ok(Feed::Rss(feed)) => feed.items().iter().map(|i| i as &FeedExt).collect(), [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stdout] --> src/watcher.rs:160:73 [INFO] [stdout] | [INFO] [stdout] 160 | Ok(Feed::Atom(feed)) => feed.entries().iter().map(|i| i as &FeedExt).collect(), [INFO] [stdout] | ^^^^^^^ help: use `dyn`: `dyn FeedExt` [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 issue #80165 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 11 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 48.40s [INFO] [stdout] warning: 11 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "e63d743d67b13597c914b54dd254cb559f7847e52e8dbf3bd50bb0f44f81598a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e63d743d67b13597c914b54dd254cb559f7847e52e8dbf3bd50bb0f44f81598a", kill_on_drop: false }` [INFO] [stdout] e63d743d67b13597c914b54dd254cb559f7847e52e8dbf3bd50bb0f44f81598a