[INFO] fetching crate strcursor 0.2.5...
[INFO] checking strcursor-0.2.5 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate strcursor 0.2.5 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate strcursor 0.2.5 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 strcursor 0.2.5
[INFO] finished tweaking crates.io crate strcursor 0.2.5
[INFO] tweaked toml for crates.io crate strcursor 0.2.5 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 4 packages
[INFO] [stderr]       Adding rustc_version v0.1.7 (latest: v0.4.0)
[INFO] [stderr]       Adding semver v0.1.20 (latest: v1.0.22)
[INFO] [stderr]       Adding unicode-segmentation v0.1.2 (latest: v1.11.0)
[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 semver v0.1.20
[INFO] [stderr]   Downloaded rustc_version v0.1.7
[INFO] [stderr]   Downloaded unicode-segmentation v0.1.2
[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] 98b23d80363f710908129a196ab2bdb391ae0db242ba1f000942a3ee9b669ccb
[INFO] running `Command { std: "docker" "start" "-a" "98b23d80363f710908129a196ab2bdb391ae0db242ba1f000942a3ee9b669ccb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98b23d80363f710908129a196ab2bdb391ae0db242ba1f000942a3ee9b669ccb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98b23d80363f710908129a196ab2bdb391ae0db242ba1f000942a3ee9b669ccb", kill_on_drop: false }`
[INFO] [stdout] 98b23d80363f710908129a196ab2bdb391ae0db242ba1f000942a3ee9b669ccb
[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] f66f5b4c627f17ddc4cc978ee1b08cc3ba5f8432787438aaa0ae0d30b056b925
[INFO] running `Command { std: "docker" "start" "-a" "f66f5b4c627f17ddc4cc978ee1b08cc3ba5f8432787438aaa0ae0d30b056b925", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]     Checking unicode-segmentation v0.1.2
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]    Compiling strcursor v0.2.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `ToOwned` is imported redundantly
[INFO] [stdout]   --> src/grapheme.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::borrow::{Borrow, Cow, ToOwned};
[INFO] [stdout]    |                                ^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToOwned` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `AsRef` is imported redundantly
[INFO] [stdout]   --> src/grapheme.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::convert::AsRef;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `AsRef` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ToOwned` is imported redundantly
[INFO] [stdout]   --> src/grapheme.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::borrow::{Borrow, Cow, ToOwned};
[INFO] [stdout]    |                                ^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToOwned` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `AsRef` is imported redundantly
[INFO] [stdout]   --> src/grapheme.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::convert::AsRef;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `AsRef` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]   --> src/grapheme.rs:86:49
[INFO] [stdout]    |
[INFO] [stdout] 86 |             Some((Gc::from_str_unchecked(gr), s.slice_unchecked(gr.len(), s.len())))
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/grapheme.rs:143:43
[INFO] [stdout]     |
[INFO] [stdout] 143 |             Gc::from_str_unchecked(self.0.slice_unchecked(base_len, self.0.len()))
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/grapheme.rs:156:20
[INFO] [stdout]     |
[INFO] [stdout] 156 |             self.0.slice_unchecked(base_len, self.0.len())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/lib.rs:404:20
[INFO] [stdout]     |
[INFO] [stdout] 404 |             self.s.slice_unchecked(0, self.byte_pos())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/lib.rs:414:20
[INFO] [stdout]     |
[INFO] [stdout] 414 |             self.s.slice_unchecked(self.byte_pos(), self.s.len())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]   --> src/grapheme.rs:86:49
[INFO] [stdout]    |
[INFO] [stdout] 86 |             Some((Gc::from_str_unchecked(gr), s.slice_unchecked(gr.len(), s.len())))
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/grapheme.rs:143:43
[INFO] [stdout]     |
[INFO] [stdout] 143 |             Gc::from_str_unchecked(self.0.slice_unchecked(base_len, self.0.len()))
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/grapheme.rs:156:20
[INFO] [stdout]     |
[INFO] [stdout] 156 |             self.0.slice_unchecked(base_len, self.0.len())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/lib.rs:404:20
[INFO] [stdout]     |
[INFO] [stdout] 404 |             self.s.slice_unchecked(0, self.byte_pos())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/lib.rs:414:20
[INFO] [stdout]     |
[INFO] [stdout] 414 |             self.s.slice_unchecked(self.byte_pos(), self.s.len())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the type `Knowledge` does not permit zero-initialization
[INFO] [stdout]   --> src/util.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |     nirvana(::std::mem::transmute(()))
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
[INFO] [stdout]    |
[INFO] [stdout] note: enums with no inhabited variants have no valid value
[INFO] [stdout]   --> src/util.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     enum Knowledge {}
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the type `Knowledge` does not permit zero-initialization
[INFO] [stdout]   --> src/util.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |     nirvana(::std::mem::transmute(()))
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
[INFO] [stdout]    |
[INFO] [stdout] note: enums with no inhabited variants have no valid value
[INFO] [stdout]   --> src/util.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     enum Knowledge {}
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.81s
[INFO] running `Command { std: "docker" "inspect" "f66f5b4c627f17ddc4cc978ee1b08cc3ba5f8432787438aaa0ae0d30b056b925", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f66f5b4c627f17ddc4cc978ee1b08cc3ba5f8432787438aaa0ae0d30b056b925", kill_on_drop: false }`
[INFO] [stdout] f66f5b4c627f17ddc4cc978ee1b08cc3ba5f8432787438aaa0ae0d30b056b925
[INFO] checking strcursor-0.2.5 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate strcursor 0.2.5 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate strcursor 0.2.5 on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate strcursor 0.2.5
[INFO] finished tweaking crates.io crate strcursor 0.2.5
[INFO] tweaked toml for crates.io crate strcursor 0.2.5 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 875b6555a973fcf5113c774b84715b0fd89374f73756ce6331afb22665d58839
[INFO] running `Command { std: "docker" "start" "-a" "875b6555a973fcf5113c774b84715b0fd89374f73756ce6331afb22665d58839", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "875b6555a973fcf5113c774b84715b0fd89374f73756ce6331afb22665d58839", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "875b6555a973fcf5113c774b84715b0fd89374f73756ce6331afb22665d58839", kill_on_drop: false }`
[INFO] [stdout] 875b6555a973fcf5113c774b84715b0fd89374f73756ce6331afb22665d58839
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "-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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f6e83d70400e9041fe67b5750c2de57e84ee35cce726b9387bbcde10d53c939e
[INFO] running `Command { std: "docker" "start" "-a" "f6e83d70400e9041fe67b5750c2de57e84ee35cce726b9387bbcde10d53c939e", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]     Checking unicode-segmentation v0.1.2
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]    Compiling strcursor v0.2.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `ToOwned` is imported redundantly
[INFO] [stdout]   --> src/grapheme.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::borrow::{Borrow, Cow, ToOwned};
[INFO] [stdout]    |                                ^^^^^^^
[INFO] [stdout]   --> /rustc/645bb72776a6a56a1a8f52631a44bd082b2ba509/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToOwned` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `AsRef` is imported redundantly
[INFO] [stdout]   --> src/grapheme.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::convert::AsRef;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/645bb72776a6a56a1a8f52631a44bd082b2ba509/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `AsRef` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ToOwned` is imported redundantly
[INFO] [stdout]   --> src/grapheme.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::borrow::{Borrow, Cow, ToOwned};
[INFO] [stdout]    |                                ^^^^^^^
[INFO] [stdout]   --> /rustc/645bb72776a6a56a1a8f52631a44bd082b2ba509/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToOwned` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `AsRef` is imported redundantly
[INFO] [stdout]   --> src/grapheme.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::convert::AsRef;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/645bb72776a6a56a1a8f52631a44bd082b2ba509/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `AsRef` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]   --> src/grapheme.rs:86:49
[INFO] [stdout]    |
[INFO] [stdout] 86 |             Some((Gc::from_str_unchecked(gr), s.slice_unchecked(gr.len(), s.len())))
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/grapheme.rs:143:43
[INFO] [stdout]     |
[INFO] [stdout] 143 |             Gc::from_str_unchecked(self.0.slice_unchecked(base_len, self.0.len()))
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/grapheme.rs:156:20
[INFO] [stdout]     |
[INFO] [stdout] 156 |             self.0.slice_unchecked(base_len, self.0.len())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/lib.rs:404:20
[INFO] [stdout]     |
[INFO] [stdout] 404 |             self.s.slice_unchecked(0, self.byte_pos())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/lib.rs:414:20
[INFO] [stdout]     |
[INFO] [stdout] 414 |             self.s.slice_unchecked(self.byte_pos(), self.s.len())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]   --> src/grapheme.rs:86:49
[INFO] [stdout]    |
[INFO] [stdout] 86 |             Some((Gc::from_str_unchecked(gr), s.slice_unchecked(gr.len(), s.len())))
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/grapheme.rs:143:43
[INFO] [stdout]     |
[INFO] [stdout] 143 |             Gc::from_str_unchecked(self.0.slice_unchecked(base_len, self.0.len()))
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/grapheme.rs:156:20
[INFO] [stdout]     |
[INFO] [stdout] 156 |             self.0.slice_unchecked(base_len, self.0.len())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/lib.rs:404:20
[INFO] [stdout]     |
[INFO] [stdout] 404 |             self.s.slice_unchecked(0, self.byte_pos())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::slice_unchecked`: use `get_unchecked(begin..end)` instead
[INFO] [stdout]    --> src/lib.rs:414:20
[INFO] [stdout]     |
[INFO] [stdout] 414 |             self.s.slice_unchecked(self.byte_pos(), self.s.len())
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the type `Knowledge` does not permit zero-initialization
[INFO] [stdout]   --> src/util.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |     nirvana(::std::mem::transmute(()))
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
[INFO] [stdout]    |
[INFO] [stdout] note: enums with no inhabited variants have no valid value
[INFO] [stdout]   --> src/util.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     enum Knowledge {}
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the type `Knowledge` does not permit zero-initialization
[INFO] [stdout]   --> src/util.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |     nirvana(::std::mem::transmute(()))
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
[INFO] [stdout]    |
[INFO] [stdout] note: enums with no inhabited variants have no valid value
[INFO] [stdout]   --> src/util.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     enum Knowledge {}
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.70s
[INFO] running `Command { std: "docker" "inspect" "f6e83d70400e9041fe67b5750c2de57e84ee35cce726b9387bbcde10d53c939e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f6e83d70400e9041fe67b5750c2de57e84ee35cce726b9387bbcde10d53c939e", kill_on_drop: false }`
[INFO] [stdout] f6e83d70400e9041fe67b5750c2de57e84ee35cce726b9387bbcde10d53c939e