[INFO] cloning repository https://github.com/remi-dupre/enum-spanner-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/remi-dupre/enum-spanner-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fremi-dupre%2Fenum-spanner-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fremi-dupre%2Fenum-spanner-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fafbc7f04dc891d11b057460c7c964a0967c18bd
[INFO] checking remi-dupre/enum-spanner-rs against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fremi-dupre%2Fenum-spanner-rs" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/remi-dupre/enum-spanner-rs
[INFO] finished tweaking git repo https://github.com/remi-dupre/enum-spanner-rs
[INFO] tweaked toml for git repo https://github.com/remi-dupre/enum-spanner-rs written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/remi-dupre/enum-spanner-rs on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/remi-dupre/enum-spanner-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1276c4b97f543f1cc893e1f7330e7b9f6061ecde0054a10097e0bd505d9fc3a2
[INFO] running `Command { std: "docker" "start" "-a" "1276c4b97f543f1cc893e1f7330e7b9f6061ecde0054a10097e0bd505d9fc3a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1276c4b97f543f1cc893e1f7330e7b9f6061ecde0054a10097e0bd505d9fc3a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1276c4b97f543f1cc893e1f7330e7b9f6061ecde0054a10097e0bd505d9fc3a2", kill_on_drop: false }`
[INFO] [stdout] 1276c4b97f543f1cc893e1f7330e7b9f6061ecde0054a10097e0bd505d9fc3a2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d5f3862ed8772bda8f89b4a676d9091e0f76a2908b42d4aff4432b5750e0a22a
[INFO] running `Command { std: "docker" "start" "-a" "d5f3862ed8772bda8f89b4a676d9091e0f76a2908b42d4aff4432b5750e0a22a", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling libc v0.2.54
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking utf8-ranges v1.0.3
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking regex-syntax v0.6.6
[INFO] [stderr]     Checking aho-corasick v0.7.4
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking enum-spanner-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait `ColMul` is never used
[INFO] [stdout]   --> src/matrix.rs:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub trait ColMul<U> {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/mapping/indexed_dag.rs:38:15
[INFO] [stdout]    |
[INFO] [stdout] 38 |         text: &str,
[INFO] [stdout]    |               ^^^^ the lifetime is elided here
[INFO] [stdout] 39 |         toggle_progress: ToggleProgress,
[INFO] [stdout] 40 |     ) -> IndexedDag {
[INFO] [stdout]    |          ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 40 |     ) -> IndexedDag<'_> {
[INFO] [stdout]    |                    ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/progress.rs:139:30
[INFO] [stdout]     |
[INFO] [stdout] 139 |           let max_iterations = iterator
[INFO] [stdout]     |  ______________________________^
[INFO] [stdout] 140 | |             .len()
[INFO] [stdout] 141 | |             .try_into()
[INFO] [stdout]     | |_______________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `enum-spanner-rs` (bin "enum-spanner-rs") due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: trait `ColMul` is never used
[INFO] [stdout]   --> src/matrix.rs:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub trait ColMul<U> {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/mapping/indexed_dag.rs:38:15
[INFO] [stdout]    |
[INFO] [stdout] 38 |         text: &str,
[INFO] [stdout]    |               ^^^^ the lifetime is elided here
[INFO] [stdout] 39 |         toggle_progress: ToggleProgress,
[INFO] [stdout] 40 |     ) -> IndexedDag {
[INFO] [stdout]    |          ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 40 |     ) -> IndexedDag<'_> {
[INFO] [stdout]    |                    ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/mapping/tests.rs:22:23
[INFO] [stdout]    |
[INFO] [stdout] 22 |     for text in texts.into_iter() {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout]    = note: `#[warn(array_into_iter)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 22 -     for text in texts.into_iter() {
[INFO] [stdout] 22 +     for text in texts.iter() {
[INFO] [stdout]    |
[INFO] [stdout] help: or remove `.into_iter()` to iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 22 -     for text in texts.into_iter() {
[INFO] [stdout] 22 +     for text in texts {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/mapping/tests.rs:32:23
[INFO] [stdout]    |
[INFO] [stdout] 32 |     for text in texts.into_iter() {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 32 -     for text in texts.into_iter() {
[INFO] [stdout] 32 +     for text in texts.iter() {
[INFO] [stdout]    |
[INFO] [stdout] help: or remove `.into_iter()` to iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 32 -     for text in texts.into_iter() {
[INFO] [stdout] 32 +     for text in texts {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/mapping/tests.rs:42:23
[INFO] [stdout]    |
[INFO] [stdout] 42 |     for text in texts.into_iter() {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 42 -     for text in texts.into_iter() {
[INFO] [stdout] 42 +     for text in texts.iter() {
[INFO] [stdout]    |
[INFO] [stdout] help: or remove `.into_iter()` to iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 42 -     for text in texts.into_iter() {
[INFO] [stdout] 42 +     for text in texts {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/mapping/tests.rs:53:23
[INFO] [stdout]    |
[INFO] [stdout] 53 |     for text in texts.into_iter() {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 53 -     for text in texts.into_iter() {
[INFO] [stdout] 53 +     for text in texts.iter() {
[INFO] [stdout]    |
[INFO] [stdout] help: or remove `.into_iter()` to iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 53 -     for text in texts.into_iter() {
[INFO] [stdout] 53 +     for text in texts {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/mapping/tests.rs:63:23
[INFO] [stdout]    |
[INFO] [stdout] 63 |     for text in texts.into_iter() {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 63 -     for text in texts.into_iter() {
[INFO] [stdout] 63 +     for text in texts.iter() {
[INFO] [stdout]    |
[INFO] [stdout] help: or remove `.into_iter()` to iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 63 -     for text in texts.into_iter() {
[INFO] [stdout] 63 +     for text in texts {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/mapping/tests.rs:80:23
[INFO] [stdout]    |
[INFO] [stdout] 80 |     for text in texts.into_iter() {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 80 -     for text in texts.into_iter() {
[INFO] [stdout] 80 +     for text in texts.iter() {
[INFO] [stdout]    |
[INFO] [stdout] help: or remove `.into_iter()` to iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 80 -     for text in texts.into_iter() {
[INFO] [stdout] 80 +     for text in texts {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/progress.rs:139:30
[INFO] [stdout]     |
[INFO] [stdout] 139 |           let max_iterations = iterator
[INFO] [stdout]     |  ______________________________^
[INFO] [stdout] 140 | |             .len()
[INFO] [stdout] 141 | |             .try_into()
[INFO] [stdout]     | |_______________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `enum-spanner-rs` (bin "enum-spanner-rs" test) due to 1 previous error; 8 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "d5f3862ed8772bda8f89b4a676d9091e0f76a2908b42d4aff4432b5750e0a22a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5f3862ed8772bda8f89b4a676d9091e0f76a2908b42d4aff4432b5750e0a22a", kill_on_drop: false }`
[INFO] [stdout] d5f3862ed8772bda8f89b4a676d9091e0f76a2908b42d4aff4432b5750e0a22a
