[INFO] fetching crate sudachiclone 0.2.1...
[INFO] checking sudachiclone-0.2.1 against master#bca37a20bd376ce3fd138e7cdee7fe704e0f8814 for pr-139493-3
[INFO] extracting crate sudachiclone 0.2.1 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate sudachiclone 0.2.1
[INFO] finished tweaking crates.io crate sudachiclone 0.2.1
[INFO] tweaked toml for crates.io crate sudachiclone 0.2.1 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate sudachiclone 0.2.1 on toolchain bca37a20bd376ce3fd138e7cdee7fe704e0f8814
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate sudachiclone 0.2.1 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" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
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[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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b959127065669ca12f7721bad49e639546dfbff945d18171e6538e5c4354bb48
[INFO] running `Command { std: "docker" "start" "-a" "b959127065669ca12f7721bad49e639546dfbff945d18171e6538e5c4354bb48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b959127065669ca12f7721bad49e639546dfbff945d18171e6538e5c4354bb48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b959127065669ca12f7721bad49e639546dfbff945d18171e6538e5c4354bb48", kill_on_drop: false }`
[INFO] [stdout] b959127065669ca12f7721bad49e639546dfbff945d18171e6538e5c4354bb48
[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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b3d10570335463b3f420427a3d0a33cce79c346cd2c6da8d140469b5fbcb1a5
[INFO] running `Command { std: "docker" "start" "-a" "8b3d10570335463b3f420427a3d0a33cce79c346cd2c6da8d140469b5fbcb1a5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling memchr v2.3.0
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]    Compiling encoding_rs v0.8.22
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking smallvec v1.1.0
[INFO] [stderr]     Checking regex-syntax v0.6.13
[INFO] [stderr]     Checking regex-automata v0.1.8
[INFO] [stderr]     Checking symlink v0.1.0
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[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rand_core v0.5.1
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[INFO] [stderr]     Checking csv-core v0.1.6
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[INFO] [stderr]     Checking bstr v0.2.9
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking csv v1.1.2
[INFO] [stderr]    Compiling thiserror-impl v1.0.9
[INFO] [stderr]     Checking regex v1.3.3
[INFO] [stderr]     Checking thiserror v1.0.9
[INFO] [stderr]     Checking sudachiclone v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/dictionary_lib/word_id_table.rs:22:20
[INFO] [stdout]    |
[INFO] [stdout] 22 |         self.bytes[(offset + i * 4)],
[INFO] [stdout]    |                    ^              ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 22 -         self.bytes[(offset + i * 4)],
[INFO] [stdout] 22 +         self.bytes[offset + i * 4 ],
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/dictionary_lib/word_id_table.rs:23:20
[INFO] [stdout]    |
[INFO] [stdout] 23 |         self.bytes[(offset + i * 4 + 1)],
[INFO] [stdout]    |                    ^                  ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 23 -         self.bytes[(offset + i * 4 + 1)],
[INFO] [stdout] 23 +         self.bytes[offset + i * 4 + 1 ],
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/dictionary_lib/word_id_table.rs:24:20
[INFO] [stdout]    |
[INFO] [stdout] 24 |         self.bytes[(offset + i * 4 + 2)],
[INFO] [stdout]    |                    ^                  ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 24 -         self.bytes[(offset + i * 4 + 2)],
[INFO] [stdout] 24 +         self.bytes[offset + i * 4 + 2 ],
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/dictionary_lib/word_id_table.rs:25:20
[INFO] [stdout]    |
[INFO] [stdout] 25 |         self.bytes[(offset + i * 4 + 3)],
[INFO] [stdout]    |                    ^                  ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 25 -         self.bytes[(offset + i * 4 + 3)],
[INFO] [stdout] 25 +         self.bytes[offset + i * 4 + 3 ],
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/dictionary_lib/word_id_table.rs:22:20
[INFO] [stdout]    |
[INFO] [stdout] 22 |         self.bytes[(offset + i * 4)],
[INFO] [stdout]    |                    ^              ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 22 -         self.bytes[(offset + i * 4)],
[INFO] [stdout] 22 +         self.bytes[offset + i * 4 ],
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/dictionary_lib/word_id_table.rs:23:20
[INFO] [stdout]    |
[INFO] [stdout] 23 |         self.bytes[(offset + i * 4 + 1)],
[INFO] [stdout]    |                    ^                  ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 23 -         self.bytes[(offset + i * 4 + 1)],
[INFO] [stdout] 23 +         self.bytes[offset + i * 4 + 1 ],
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/dictionary_lib/word_id_table.rs:24:20
[INFO] [stdout]    |
[INFO] [stdout] 24 |         self.bytes[(offset + i * 4 + 2)],
[INFO] [stdout]    |                    ^                  ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 24 -         self.bytes[(offset + i * 4 + 2)],
[INFO] [stdout] 24 +         self.bytes[offset + i * 4 + 2 ],
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/dictionary_lib/word_id_table.rs:25:20
[INFO] [stdout]    |
[INFO] [stdout] 25 |         self.bytes[(offset + i * 4 + 3)],
[INFO] [stdout]    |                    ^                  ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 25 -         self.bytes[(offset + i * 4 + 3)],
[INFO] [stdout] 25 +         self.bytes[offset + i * 4 + 3 ],
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/morpheme_list.rs:56:15
[INFO] [stdout]    |
[INFO] [stdout] 56 |   pub fn iter(&self) -> MorphemeIterator {
[INFO] [stdout]    |               ^^^^^     ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |               |
[INFO] [stdout]    |               the lifetime is elided 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] 56 |   pub fn iter(&self) -> MorphemeIterator<'_> {
[INFO] [stdout]    |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/tokenizer.rs:89:33
[INFO] [stdout]    |
[INFO] [stdout] 89 |           process_oov(oov_plugin.deref(), input, i, &mut has_words, &mut lattice);
[INFO] [stdout]    |                                 ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `OovProviderPlugin` does not implement `Deref`, so calling `deref` on `&OovProviderPlugin` copies the reference, which does not do anything and can be removed
[INFO] [stdout]    = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 89 -           process_oov(oov_plugin.deref(), input, i, &mut has_words, &mut lattice);
[INFO] [stdout] 89 +           process_oov(oov_plugin, input, i, &mut has_words, &mut lattice);
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `OovProviderPlugin`, implement `Clone` for it
[INFO] [stdout]   --> src/plugin/oov_provider_plugin.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 + #[derive(Clone)]
[INFO] [stdout] 14 | pub enum OovProviderPlugin {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/tokenizer.rs:94:33
[INFO] [stdout]    |
[INFO] [stdout] 94 |           process_oov(oov_plugin.deref(), input, i, &mut has_words, &mut lattice);
[INFO] [stdout]    |                                 ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `OovProviderPlugin` does not implement `Deref`, so calling `deref` on `&OovProviderPlugin` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 94 -           process_oov(oov_plugin.deref(), input, i, &mut has_words, &mut lattice);
[INFO] [stdout] 94 +           process_oov(oov_plugin, input, i, &mut has_words, &mut lattice);
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `OovProviderPlugin`, implement `Clone` for it
[INFO] [stdout]   --> src/plugin/oov_provider_plugin.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 + #[derive(Clone)]
[INFO] [stdout] 14 | pub enum OovProviderPlugin {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/tokenizer.rs:98:16
[INFO] [stdout]    |
[INFO] [stdout] 98 |         panic!(format!("there is no morpheme at {}", i));
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `panic!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 98 -         panic!(format!("there is no morpheme at {}", i));
[INFO] [stdout] 98 +         panic!("there is no morpheme at {}", i);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/utf8_input_text.rs:21:20
[INFO] [stdout]    |
[INFO] [stdout] 21 |   fn get_substring(&self, start: usize, end: usize) -> Result<Cow<str>, ()>;
[INFO] [stdout]    |                    ^^^^^ the lifetime is elided here          ^^^^^^^^ 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] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 21 |   fn get_substring(&self, start: usize, end: usize) -> Result<Cow<'_, str>, ()>;
[INFO] [stdout]    |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/utf8_input_text.rs:75:20
[INFO] [stdout]    |
[INFO] [stdout] 75 |   fn get_substring(&self, start: usize, end: usize) -> Result<Cow<str>, ()> {
[INFO] [stdout]    |                    ^^^^^ the lifetime is elided here          ^^^^^^^^ 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] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 75 |   fn get_substring(&self, start: usize, end: usize) -> Result<Cow<'_, str>, ()> {
[INFO] [stdout]    |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/morpheme_list.rs:56:15
[INFO] [stdout]    |
[INFO] [stdout] 56 |   pub fn iter(&self) -> MorphemeIterator {
[INFO] [stdout]    |               ^^^^^     ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |               |
[INFO] [stdout]    |               the lifetime is elided 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] 56 |   pub fn iter(&self) -> MorphemeIterator<'_> {
[INFO] [stdout]    |                                         ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/plugin/mecab_oov_plugin.rs:317:22
[INFO] [stdout]     |
[INFO] [stdout] 317 |     fn get_substring(&self, start: usize, end: usize) -> Result<Cow<str>, ()> {
[INFO] [stdout]     |                      ^^^^^ the lifetime is elided here          ^^^^^^^^ 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] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 317 |     fn get_substring(&self, start: usize, end: usize) -> Result<Cow<'_, str>, ()> {
[INFO] [stdout]     |                                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/tokenizer.rs:89:33
[INFO] [stdout]    |
[INFO] [stdout] 89 |           process_oov(oov_plugin.deref(), input, i, &mut has_words, &mut lattice);
[INFO] [stdout]    |                                 ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `OovProviderPlugin` does not implement `Deref`, so calling `deref` on `&OovProviderPlugin` copies the reference, which does not do anything and can be removed
[INFO] [stdout]    = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 89 -           process_oov(oov_plugin.deref(), input, i, &mut has_words, &mut lattice);
[INFO] [stdout] 89 +           process_oov(oov_plugin, input, i, &mut has_words, &mut lattice);
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `OovProviderPlugin`, implement `Clone` for it
[INFO] [stdout]   --> src/plugin/oov_provider_plugin.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 + #[derive(Clone)]
[INFO] [stdout] 14 | pub enum OovProviderPlugin {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/tokenizer.rs:94:33
[INFO] [stdout]    |
[INFO] [stdout] 94 |           process_oov(oov_plugin.deref(), input, i, &mut has_words, &mut lattice);
[INFO] [stdout]    |                                 ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `OovProviderPlugin` does not implement `Deref`, so calling `deref` on `&OovProviderPlugin` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 94 -           process_oov(oov_plugin.deref(), input, i, &mut has_words, &mut lattice);
[INFO] [stdout] 94 +           process_oov(oov_plugin, input, i, &mut has_words, &mut lattice);
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `OovProviderPlugin`, implement `Clone` for it
[INFO] [stdout]   --> src/plugin/oov_provider_plugin.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 + #[derive(Clone)]
[INFO] [stdout] 14 | pub enum OovProviderPlugin {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/tokenizer.rs:98:16
[INFO] [stdout]    |
[INFO] [stdout] 98 |         panic!(format!("there is no morpheme at {}", i));
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `panic!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 98 -         panic!(format!("there is no morpheme at {}", i));
[INFO] [stdout] 98 +         panic!("there is no morpheme at {}", i);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/utf8_input_text.rs:21:20
[INFO] [stdout]    |
[INFO] [stdout] 21 |   fn get_substring(&self, start: usize, end: usize) -> Result<Cow<str>, ()>;
[INFO] [stdout]    |                    ^^^^^ the lifetime is elided here          ^^^^^^^^ 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] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 21 |   fn get_substring(&self, start: usize, end: usize) -> Result<Cow<'_, str>, ()>;
[INFO] [stdout]    |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/utf8_input_text.rs:75:20
[INFO] [stdout]    |
[INFO] [stdout] 75 |   fn get_substring(&self, start: usize, end: usize) -> Result<Cow<str>, ()> {
[INFO] [stdout]    |                    ^^^^^ the lifetime is elided here          ^^^^^^^^ 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] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 75 |   fn get_substring(&self, start: usize, end: usize) -> Result<Cow<'_, str>, ()> {
[INFO] [stdout]    |                                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.95s
[INFO] running `Command { std: "docker" "inspect" "8b3d10570335463b3f420427a3d0a33cce79c346cd2c6da8d140469b5fbcb1a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b3d10570335463b3f420427a3d0a33cce79c346cd2c6da8d140469b5fbcb1a5", kill_on_drop: false }`
[INFO] [stdout] 8b3d10570335463b3f420427a3d0a33cce79c346cd2c6da8d140469b5fbcb1a5
