[INFO] cloning repository https://github.com/Mr-Helpful/scrabble.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Mr-Helpful/scrabble.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMr-Helpful%2Fscrabble.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMr-Helpful%2Fscrabble.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cb9662b2f6fb74bec5e1c6eed9181f118ed2fd63
[INFO] testing Mr-Helpful/scrabble.rs against master#1ef7943ee607160a564655b6596f83670ef95df5 for pr-146098-6
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMr-Helpful%2Fscrabble.rs" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Mr-Helpful/scrabble.rs
[INFO] finished tweaking git repo https://github.com/Mr-Helpful/scrabble.rs
[INFO] tweaked toml for git repo https://github.com/Mr-Helpful/scrabble.rs written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Mr-Helpful/scrabble.rs on toolchain 1ef7943ee607160a564655b6596f83670ef95df5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1ef7943ee607160a564655b6596f83670ef95df5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Mr-Helpful/scrabble.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" "+1ef7943ee607160a564655b6596f83670ef95df5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded weak-table v0.3.2
[INFO] [stderr]   Downloaded trees v0.4.2
[INFO] [stderr]   Downloaded memchr v2.6.2
[INFO] [stderr]   Downloaded allwords v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1ef7943ee607160a564655b6596f83670ef95df5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 244736b040a43c7f7f66c6c64887367d4f302e04944f73d9b3b53938707c694d
[INFO] running `Command { std: "docker" "start" "-a" "244736b040a43c7f7f66c6c64887367d4f302e04944f73d9b3b53938707c694d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "244736b040a43c7f7f66c6c64887367d4f302e04944f73d9b3b53938707c694d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "244736b040a43c7f7f66c6c64887367d4f302e04944f73d9b3b53938707c694d", kill_on_drop: false }`
[INFO] [stdout] 244736b040a43c7f7f66c6c64887367d4f302e04944f73d9b3b53938707c694d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1ef7943ee607160a564655b6596f83670ef95df5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef0708039ea48905c005a024a412f14db9b53648b57c47838fd11e45f96f2845
[INFO] running `Command { std: "docker" "start" "-a" "ef0708039ea48905c005a024a412f14db9b53648b57c47838fd11e45f96f2845", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.6.2
[INFO] [stderr]    Compiling allwords v0.1.2
[INFO] [stderr]    Compiling weak-table v0.3.2
[INFO] [stderr]    Compiling trees v0.4.2
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling scrabble v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/letter/unparse.rs:28:16
[INFO] [stdout]    |
[INFO] [stdout] 28 |   TooManyChars(usize),
[INFO] [stdout]    |   ------------ ^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 28 -   TooManyChars(usize),
[INFO] [stdout] 28 +   TooManyChars(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/letter/unparse.rs:29:15
[INFO] [stdout]    |
[INFO] [stdout] 29 |   TooFewChars(usize),
[INFO] [stdout]    |   ----------- ^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 29 -   TooFewChars(usize),
[INFO] [stdout] 29 +   TooFewChars(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StringIterator` is never constructed
[INFO] [stdout]    --> src/trie/node_trait.rs:255:12
[INFO] [stdout]     |
[INFO] [stdout] 255 | pub struct StringIterator<'a, T: TrieNode> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/dawg/ptrs.rs:68:20
[INFO] [stdout]    |
[INFO] [stdout] 68 |     self.0.as_ref().borrow()
[INFO] [stdout]    |                    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `Node` does not implement `Borrow`, so calling `borrow` on `&Node` 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] 68 -     self.0.as_ref().borrow()
[INFO] [stdout] 68 +     self.0.as_ref()
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `Node`, implement `Clone` for it
[INFO] [stdout]    |
[INFO] [stdout] 59 + #[derive(Clone)]
[INFO] [stdout] 60 | pub struct Node {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/dawg/ptrs.rs:74:20
[INFO] [stdout]    |
[INFO] [stdout] 74 |     self.0.as_ref().borrow()
[INFO] [stdout]    |                    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `Node` does not implement `Borrow`, so calling `borrow` on `&Node` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 74 -     self.0.as_ref().borrow()
[INFO] [stdout] 74 +     self.0.as_ref()
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `Node`, implement `Clone` for it
[INFO] [stdout]    |
[INFO] [stdout] 59 + #[derive(Clone)]
[INFO] [stdout] 60 | pub struct Node {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/trie/node_trait.rs:223:64
[INFO] [stdout]     |
[INFO] [stdout] 223 |   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout]     |                   --               --                          ^^ the same lifetime is elided here
[INFO] [stdout]     |                   |                |
[INFO] [stdout]     |                   |                the lifetime is named here
[INFO] [stdout]     |                   the lifetime is named 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: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 223 -   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout] 223 +   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'a, Self> {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.87s
[INFO] running `Command { std: "docker" "inspect" "ef0708039ea48905c005a024a412f14db9b53648b57c47838fd11e45f96f2845", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef0708039ea48905c005a024a412f14db9b53648b57c47838fd11e45f96f2845", kill_on_drop: false }`
[INFO] [stdout] ef0708039ea48905c005a024a412f14db9b53648b57c47838fd11e45f96f2845
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1ef7943ee607160a564655b6596f83670ef95df5" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 25028ac334582a6c09f643fac5dc8d352eaefa16f37c860cfd28ab698d3df87a
[INFO] running `Command { std: "docker" "start" "-a" "25028ac334582a6c09f643fac5dc8d352eaefa16f37c860cfd28ab698d3df87a", kill_on_drop: false }`
[INFO] [stderr]    Compiling scrabble v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/letter/unparse.rs:28:16
[INFO] [stdout]    |
[INFO] [stdout] 28 |   TooManyChars(usize),
[INFO] [stdout]    |   ------------ ^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 28 -   TooManyChars(usize),
[INFO] [stdout] 28 +   TooManyChars(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/letter/unparse.rs:29:15
[INFO] [stdout]    |
[INFO] [stdout] 29 |   TooFewChars(usize),
[INFO] [stdout]    |   ----------- ^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 29 -   TooFewChars(usize),
[INFO] [stdout] 29 +   TooFewChars(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StringIterator` is never constructed
[INFO] [stdout]    --> src/trie/node_trait.rs:255:12
[INFO] [stdout]     |
[INFO] [stdout] 255 | pub struct StringIterator<'a, T: TrieNode> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/dawg/ptrs.rs:68:20
[INFO] [stdout]    |
[INFO] [stdout] 68 |     self.0.as_ref().borrow()
[INFO] [stdout]    |                    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `Node` does not implement `Borrow`, so calling `borrow` on `&Node` 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] 68 -     self.0.as_ref().borrow()
[INFO] [stdout] 68 +     self.0.as_ref()
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `Node`, implement `Clone` for it
[INFO] [stdout]    |
[INFO] [stdout] 59 + #[derive(Clone)]
[INFO] [stdout] 60 | pub struct Node {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/dawg/ptrs.rs:74:20
[INFO] [stdout]    |
[INFO] [stdout] 74 |     self.0.as_ref().borrow()
[INFO] [stdout]    |                    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `Node` does not implement `Borrow`, so calling `borrow` on `&Node` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 74 -     self.0.as_ref().borrow()
[INFO] [stdout] 74 +     self.0.as_ref()
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `Node`, implement `Clone` for it
[INFO] [stdout]    |
[INFO] [stdout] 59 + #[derive(Clone)]
[INFO] [stdout] 60 | pub struct Node {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/trie/node_trait.rs:223:64
[INFO] [stdout]     |
[INFO] [stdout] 223 |   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout]     |                   --               --                          ^^ the same lifetime is elided here
[INFO] [stdout]     |                   |                |
[INFO] [stdout]     |                   |                the lifetime is named here
[INFO] [stdout]     |                   the lifetime is named 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: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 223 -   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout] 223 +   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'a, Self> {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/letter/unparse.rs:28:16
[INFO] [stdout]    |
[INFO] [stdout] 28 |   TooManyChars(usize),
[INFO] [stdout]    |   ------------ ^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 28 -   TooManyChars(usize),
[INFO] [stdout] 28 +   TooManyChars(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/letter/unparse.rs:29:15
[INFO] [stdout]    |
[INFO] [stdout] 29 |   TooFewChars(usize),
[INFO] [stdout]    |   ----------- ^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 29 -   TooFewChars(usize),
[INFO] [stdout] 29 +   TooFewChars(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StringIterator` is never constructed
[INFO] [stdout]    --> src/trie/node_trait.rs:255:12
[INFO] [stdout]     |
[INFO] [stdout] 255 | pub struct StringIterator<'a, T: TrieNode> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/dawg/ptrs.rs:68:20
[INFO] [stdout]    |
[INFO] [stdout] 68 |     self.0.as_ref().borrow()
[INFO] [stdout]    |                    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `Node` does not implement `Borrow`, so calling `borrow` on `&Node` 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] 68 -     self.0.as_ref().borrow()
[INFO] [stdout] 68 +     self.0.as_ref()
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `Node`, implement `Clone` for it
[INFO] [stdout]    |
[INFO] [stdout] 59 + #[derive(Clone)]
[INFO] [stdout] 60 | pub struct Node {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/dawg/ptrs.rs:74:20
[INFO] [stdout]    |
[INFO] [stdout] 74 |     self.0.as_ref().borrow()
[INFO] [stdout]    |                    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `Node` does not implement `Borrow`, so calling `borrow` on `&Node` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 74 -     self.0.as_ref().borrow()
[INFO] [stdout] 74 +     self.0.as_ref()
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `Node`, implement `Clone` for it
[INFO] [stdout]    |
[INFO] [stdout] 59 + #[derive(Clone)]
[INFO] [stdout] 60 | pub struct Node {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/trie/node_trait.rs:223:64
[INFO] [stdout]     |
[INFO] [stdout] 223 |   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout]     |                   --               --                          ^^ the same lifetime is elided here
[INFO] [stdout]     |                   |                |
[INFO] [stdout]     |                   |                the lifetime is named here
[INFO] [stdout]     |                   the lifetime is named 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: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 223 -   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout] 223 +   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'a, Self> {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.27s
[INFO] running `Command { std: "docker" "inspect" "25028ac334582a6c09f643fac5dc8d352eaefa16f37c860cfd28ab698d3df87a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25028ac334582a6c09f643fac5dc8d352eaefa16f37c860cfd28ab698d3df87a", kill_on_drop: false }`
[INFO] [stdout] 25028ac334582a6c09f643fac5dc8d352eaefa16f37c860cfd28ab698d3df87a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1ef7943ee607160a564655b6596f83670ef95df5" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4f683ec35ea2eae45a3d90d7c929d831abd6340aabbd3884054340a7594b863f
[INFO] running `Command { std: "docker" "start" "-a" "4f683ec35ea2eae45a3d90d7c929d831abd6340aabbd3884054340a7594b863f", kill_on_drop: false }`
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/letter/unparse.rs:28:16
[INFO] [stderr]    |
[INFO] [stderr] 28 |   TooManyChars(usize),
[INFO] [stderr]    |   ------------ ^^^^^
[INFO] [stderr]    |   |
[INFO] [stderr]    |   field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 28 -   TooManyChars(usize),
[INFO] [stderr] 28 +   TooManyChars(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/letter/unparse.rs:29:15
[INFO] [stderr]    |
[INFO] [stderr] 29 |   TooFewChars(usize),
[INFO] [stderr]    |   ----------- ^^^^^
[INFO] [stderr]    |   |
[INFO] [stderr]    |   field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `ErrorKind` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 29 -   TooFewChars(usize),
[INFO] [stderr] 29 +   TooFewChars(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: struct `StringIterator` is never constructed
[INFO] [stderr]    --> src/trie/node_trait.rs:255:12
[INFO] [stderr]     |
[INFO] [stderr] 255 | pub struct StringIterator<'a, T: TrieNode> {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stderr]   --> src/dawg/ptrs.rs:68:20
[INFO] [stderr]    |
[INFO] [stderr] 68 |     self.0.as_ref().borrow()
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: the type `Node` does not implement `Borrow`, so calling `borrow` on `&Node` copies the reference, which does not do anything and can be removed
[INFO] [stderr]    = note: `#[warn(noop_method_call)]` on by default
[INFO] [stderr] help: remove this redundant call
[INFO] [stderr]    |
[INFO] [stderr] 68 -     self.0.as_ref().borrow()
[INFO] [stderr] 68 +     self.0.as_ref()
[INFO] [stderr]    |
[INFO] [stderr] help: if you meant to clone `Node`, implement `Clone` for it
[INFO] [stderr]    |
[INFO] [stderr] 59 + #[derive(Clone)]
[INFO] [stderr] 60 | pub struct Node {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stderr]   --> src/dawg/ptrs.rs:74:20
[INFO] [stderr]    |
[INFO] [stderr] 74 |     self.0.as_ref().borrow()
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: the type `Node` does not implement `Borrow`, so calling `borrow` on `&Node` copies the reference, which does not do anything and can be removed
[INFO] [stderr] help: remove this redundant call
[INFO] [stderr]    |
[INFO] [stderr] 74 -     self.0.as_ref().borrow()
[INFO] [stderr] 74 +     self.0.as_ref()
[INFO] [stderr]    |
[INFO] [stderr] help: if you meant to clone `Node`, implement `Clone` for it
[INFO] [stderr]    |
[INFO] [stderr] 59 + #[derive(Clone)]
[INFO] [stderr] 60 | pub struct Node {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stderr]    --> src/trie/node_trait.rs:223:64
[INFO] [stderr]     |
[INFO] [stderr] 223 |   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stderr]     |                   --               --                          ^^ the same lifetime is elided here
[INFO] [stderr]     |                   |                |
[INFO] [stderr]     |                   |                the lifetime is named here
[INFO] [stderr]     |                   the lifetime is named here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: consistently use `'a`
[INFO] [stderr]     |
[INFO] [stderr] 223 -   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stderr] 223 +   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'a, Self> {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: `scrabble` (lib) generated 6 warnings (run `cargo fix --lib -p scrabble` to apply 3 suggestions)
[INFO] [stderr] warning: `scrabble` (lib test) generated 6 warnings (6 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/scrabble-6aa2903cc16ee615)
[INFO] [stdout] 
[INFO] [stdout] running 22 tests
[INFO] [stdout] test trie_ptr::test::collection_tests::empty::is_leaf ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::empty::is_empty ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::empty::len_0 ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::char_range_group ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::char_group ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::empty ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::mixed_all ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::single_char ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::ranges ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::single_word ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::two_group ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::add::has ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::mixed_group ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::wildcard ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::has::char ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::has::nothing ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::has::empty ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::sub::empty_sub ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::sub::add_sub ... FAILED
[INFO] [stdout] test trie_ptr::test::set_tests::has::word ... FAILED
[INFO] [stdout] test trie_ptr::test::set_tests::sub::word_sub ... FAILED
[INFO] [stderr] error: test failed, to rerun pass `--lib`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/deps/scrabble-6aa2903cc16ee615` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "4f683ec35ea2eae45a3d90d7c929d831abd6340aabbd3884054340a7594b863f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f683ec35ea2eae45a3d90d7c929d831abd6340aabbd3884054340a7594b863f", kill_on_drop: false }`
[INFO] [stdout] 4f683ec35ea2eae45a3d90d7c929d831abd6340aabbd3884054340a7594b863f
