[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 try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMr-Helpful%2Fscrabble.rs" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-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-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Mr-Helpful/scrabble.rs on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "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 ...
[INFO] [stderr]   Downloaded allwords v0.1.2
[INFO] [stderr]   Downloaded minimal-lexical v0.2.1
[INFO] [stderr]   Downloaded trees v0.4.2
[INFO] [stderr]   Downloaded memchr v2.6.2
[INFO] [stderr]   Downloaded nom v7.1.3
[INFO] [stderr]   Downloaded weak-table v0.3.2
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.17
[INFO] [stderr]   Downloaded libc v0.2.137
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6b64b9fd373d1ffe16637090f393adff42af10480fce42fdc07802f277300ab1
[INFO] running `Command { std: "docker" "start" "-a" "6b64b9fd373d1ffe16637090f393adff42af10480fce42fdc07802f277300ab1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6b64b9fd373d1ffe16637090f393adff42af10480fce42fdc07802f277300ab1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b64b9fd373d1ffe16637090f393adff42af10480fce42fdc07802f277300ab1", kill_on_drop: false }`
[INFO] [stdout] 6b64b9fd373d1ffe16637090f393adff42af10480fce42fdc07802f277300ab1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] bca9655e676d9f79fc49ee13bd4ccf1e77ca6cceab415a9b5dfe1815264a2859
[INFO] running `Command { std: "docker" "start" "-a" "bca9655e676d9f79fc49ee13bd4ccf1e77ca6cceab415a9b5dfe1815264a2859", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.137
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling memchr v2.6.2
[INFO] [stderr]    Compiling minimal-lexical v0.2.1
[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 getrandom v0.2.8
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[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 `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 `Debug` and `Clone`, 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]     = note: `StringIterator` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[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: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/trie/node_trait.rs:223:19
[INFO] [stdout]     |
[INFO] [stdout] 223 |   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout]     |                   ^^               ^^                          -- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                   |                |
[INFO] [stdout]     |                   |                these lifetimes flow to the output
[INFO] [stdout]     |                   these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to 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 5.56s
[INFO] running `Command { std: "docker" "inspect" "bca9655e676d9f79fc49ee13bd4ccf1e77ca6cceab415a9b5dfe1815264a2859", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bca9655e676d9f79fc49ee13bd4ccf1e77ca6cceab415a9b5dfe1815264a2859", kill_on_drop: false }`
[INFO] [stdout] bca9655e676d9f79fc49ee13bd4ccf1e77ca6cceab415a9b5dfe1815264a2859
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--no-run" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 9b7619fcb7bf43e126888b1d671b7bdf909daf1b24b4023fdd8730d9f0c796a5
[INFO] running `Command { std: "docker" "start" "-a" "9b7619fcb7bf43e126888b1d671b7bdf909daf1b24b4023fdd8730d9f0c796a5", kill_on_drop: false }`
[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 `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 `Debug` and `Clone`, 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]     = note: `StringIterator` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling scrabble v0.1.0 (/opt/rustwide/workdir)
[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: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/trie/node_trait.rs:223:19
[INFO] [stdout]     |
[INFO] [stdout] 223 |   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout]     |                   ^^               ^^                          -- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                   |                |
[INFO] [stdout]     |                   |                these lifetimes flow to the output
[INFO] [stdout]     |                   these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to 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 `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 `Debug` and `Clone`, 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]     = note: `StringIterator` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[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: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/trie/node_trait.rs:223:19
[INFO] [stdout]     |
[INFO] [stdout] 223 |   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stdout]     |                   ^^               ^^                          -- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                   |                |
[INFO] [stdout]     |                   |                these lifetimes flow to the output
[INFO] [stdout]     |                   these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to 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 1.04s
[INFO] running `Command { std: "docker" "inspect" "9b7619fcb7bf43e126888b1d671b7bdf909daf1b24b4023fdd8730d9f0c796a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b7619fcb7bf43e126888b1d671b7bdf909daf1b24b4023fdd8730d9f0c796a5", kill_on_drop: false }`
[INFO] [stdout] 9b7619fcb7bf43e126888b1d671b7bdf909daf1b24b4023fdd8730d9f0c796a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 612dde2dcc6c195afa6eaaf6c81507c2d08131921a270ab0b67d2eb3f660e4b2
[INFO] running `Command { std: "docker" "start" "-a" "612dde2dcc6c195afa6eaaf6c81507c2d08131921a270ab0b67d2eb3f660e4b2", 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 `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` 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 `Debug` and `Clone`, 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]     = note: `StringIterator` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[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] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] running 22 tests
[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] [stdout] test trie_ptr::test::collection_tests::empty::is_empty ... ok
[INFO] [stderr]   --> src/dawg/ptrs.rs:74:20
[INFO] [stdout] test trie_ptr::test::collection_tests::empty::is_leaf ... ok
[INFO] [stderr]    |
[INFO] [stdout] test trie_ptr::test::collection_tests::empty::len_0 ... ok
[INFO] [stderr] 74 |     self.0.as_ref().borrow()
[INFO] [stdout] test trie_ptr::test::collection_tests::word::char_range_group ... ok
[INFO] [stderr]    |                    ^^^^^^^^^
[INFO] [stdout] test trie_ptr::test::collection_tests::word::char_group ... ok
[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: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stderr]    --> src/trie/node_trait.rs:223:19
[INFO] [stderr]     |
[INFO] [stderr] 223 |   fn extract<'a>(&'a self, other: &'a Self) -> ExtractIterator<'_, Self> {
[INFO] [stderr]     |                   ^^               ^^                          -- the lifetime gets resolved as `'a`
[INFO] [stderr]     |                   |                |
[INFO] [stderr]     |                   |                these lifetimes flow to the output
[INFO] [stderr]     |                   these lifetimes flow to the output
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: one option is to 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 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/x86_64-unknown-linux-musl/debug/deps/scrabble-dd1fbc16e8ece70b)
[INFO] [stdout] test trie_ptr::test::collection_tests::word::mixed_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::ranges ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::single_char ... 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::has::empty ... ok
[INFO] [stdout] test trie_ptr::test::collection_tests::word::wildcard ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::sub::empty_sub ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::has::nothing ... ok
[INFO] [stdout] test trie_ptr::test::set_tests::has::char ... 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::add::has ... 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/x86_64-unknown-linux-musl/debug/deps/scrabble-dd1fbc16e8ece70b` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "612dde2dcc6c195afa6eaaf6c81507c2d08131921a270ab0b67d2eb3f660e4b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "612dde2dcc6c195afa6eaaf6c81507c2d08131921a270ab0b67d2eb3f660e4b2", kill_on_drop: false }`
[INFO] [stdout] 612dde2dcc6c195afa6eaaf6c81507c2d08131921a270ab0b67d2eb3f660e4b2