[INFO] cloning repository https://github.com/dajinchu/boggle
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dajinchu/boggle" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdajinchu%2Fboggle", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdajinchu%2Fboggle'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d74f689c074b6440704c1958596777ba9ad7ac6c
[INFO] testing dajinchu/boggle against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdajinchu%2Fboggle" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dajinchu/boggle on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dajinchu/boggle
[INFO] finished tweaking git repo https://github.com/dajinchu/boggle
[INFO] tweaked toml for git repo https://github.com/dajinchu/boggle written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/dajinchu/boggle already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded yada v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 74ed87d58aa520f75231261b696ae0e3b5dfd1ac8a90e39ec1c2d95e9e761a2a
[INFO] running `Command { std: "docker" "start" "-a" "74ed87d58aa520f75231261b696ae0e3b5dfd1ac8a90e39ec1c2d95e9e761a2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "74ed87d58aa520f75231261b696ae0e3b5dfd1ac8a90e39ec1c2d95e9e761a2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74ed87d58aa520f75231261b696ae0e3b5dfd1ac8a90e39ec1c2d95e9e761a2a", kill_on_drop: false }`
[INFO] [stdout] 74ed87d58aa520f75231261b696ae0e3b5dfd1ac8a90e39ec1c2d95e9e761a2a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] de803c4514b872765da8b710de09ac805e5f4820387a11fad87ac73f1506fae8
[INFO] running `Command { std: "docker" "start" "-a" "de803c4514b872765da8b710de09ac805e5f4820387a11fad87ac73f1506fae8", kill_on_drop: false }`
[INFO] [stderr]    Compiling endian-type v0.1.2
[INFO] [stderr]    Compiling typed-arena v2.0.1
[INFO] [stderr]    Compiling yada v0.5.0
[INFO] [stderr]    Compiling nibble_vec v0.1.0
[INFO] [stderr]    Compiling radix_trie v0.2.1
[INFO] [stderr]    Compiling boggle v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::Trie`
[INFO] [stdout]  --> src/word_dict/radix_lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use super::Trie;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/word_dict/yada.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::Trie`
[INFO] [stdout]  --> src/word_dict/yada.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use super::Trie;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::word_dict::Trie`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::word_dict::Trie;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::word_dict::hashmap::TrieHashMap`
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use crate::word_dict::hashmap::TrieHashMap;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::word_dict::linkedlist::TrieLinkedList`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use crate::word_dict::linkedlist::TrieLinkedList;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `debug`
[INFO] [stdout]   --> src/word_dict/linkedlist.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |         let debug = word.starts_with("spoon");
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_debug`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/word_dict/linkedlist.rs:58:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |         while let Some((i, c)) = chars.next() {
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/word_dict/radix_lib.rs:13:18
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn blank(c: char) -> TrieRadix {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `blank`
[INFO] [stdout]   --> src/word_dict/hashmap.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn blank() -> TrieHashMap {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_file`
[INFO] [stdout]   --> src/word_dict/hashmap.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn from_file(filename: &str) -> Result<TrieHashMap, Error> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_word`
[INFO] [stdout]   --> src/word_dict/hashmap.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn add_word(&mut self, word: &str) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `blank`
[INFO] [stdout]   --> src/word_dict/linkedlist.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn blank<'a>(c: char) -> TrieLinkedList {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_file`
[INFO] [stdout]   --> src/word_dict/linkedlist.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |     pub fn from_file(filename: &str) -> Result<TrieLinkedList, Error> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_word`
[INFO] [stdout]   --> src/word_dict/linkedlist.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 |     fn add_word(&mut self, word: &str) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `blank`
[INFO] [stdout]   --> src/word_dict/vec.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub fn blank() -> TrieVec {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_file`
[INFO] [stdout]   --> src/word_dict/vec.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn from_file(filename: &str) -> Result<TrieVec, Error> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_word`
[INFO] [stdout]   --> src/word_dict/vec.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn add_word(&mut self, word: &str) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `vec`
[INFO] [stdout]  --> src/word_dict/naive.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     vec: Vec<String>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `TrieNaive` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/word_dict/naive.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[derive(Clone, Debug)]
[INFO] [stdout]   |          ^^^^^  ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `blank`
[INFO] [stdout]   --> src/word_dict/naive.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn blank() -> TrieNaive {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_file`
[INFO] [stdout]   --> src/word_dict/naive.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub fn from_file(filename: &str) -> Result<TrieNaive, Error> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_word`
[INFO] [stdout]   --> src/word_dict/naive.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn add_word(&mut self, word: &str) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_word`
[INFO] [stdout]   --> src/word_dict/naive.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn is_word(&self, word: &str) -> bool {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_prefix`
[INFO] [stdout]   --> src/word_dict/naive.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn is_prefix(&self, word: &str) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `trie`
[INFO] [stdout]  --> src/word_dict/radix_lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     trie: radix_trie::Trie<String, bool>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `TrieRadix` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/word_dict/radix_lib.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | #[derive(Debug)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `blank`
[INFO] [stdout]   --> src/word_dict/radix_lib.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn blank(c: char) -> TrieRadix {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_file`
[INFO] [stdout]   --> src/word_dict/radix_lib.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn from_file(filename: &str) -> Result<TrieRadix, Error> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_word`
[INFO] [stdout]   --> src/word_dict/radix_lib.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn add_word(&mut self, word: &str) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `TrieYada`
[INFO] [stdout]   --> src/word_dict/yada.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct TrieYada {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_file`
[INFO] [stdout]   --> src/word_dict/yada.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn from_file(filename: &str) -> Result<TrieYada, Error> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_words`
[INFO] [stdout]   --> src/word_dict/yada.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn from_words(words: Vec<String>) -> TrieYada {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `boggle` due to 2 previous errors; 31 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "de803c4514b872765da8b710de09ac805e5f4820387a11fad87ac73f1506fae8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de803c4514b872765da8b710de09ac805e5f4820387a11fad87ac73f1506fae8", kill_on_drop: false }`
[INFO] [stdout] de803c4514b872765da8b710de09ac805e5f4820387a11fad87ac73f1506fae8