[INFO] fetching crate trie-generic 1.1.8...
[INFO] checking trie-generic-1.1.8 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate trie-generic 1.1.8 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate trie-generic 1.1.8 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate trie-generic 1.1.8
[INFO] finished tweaking crates.io crate trie-generic 1.1.8
[INFO] tweaked toml for crates.io crate trie-generic 1.1.8 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate trie-generic 1.1.8 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8d8b13882596e751f0df02c539b194372c9a7983a2bd0c4371b9dab8bac4415c
[INFO] running `Command { std: "docker" "start" "-a" "8d8b13882596e751f0df02c539b194372c9a7983a2bd0c4371b9dab8bac4415c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d8b13882596e751f0df02c539b194372c9a7983a2bd0c4371b9dab8bac4415c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d8b13882596e751f0df02c539b194372c9a7983a2bd0c4371b9dab8bac4415c", kill_on_drop: false }`
[INFO] [stdout] 8d8b13882596e751f0df02c539b194372c9a7983a2bd0c4371b9dab8bac4415c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa1d75b9818ec5f5796b133fdcebe03748412b9ee47c78f80203ad65b65761e0
[INFO] running `Command { std: "docker" "start" "-a" "fa1d75b9818ec5f5796b133fdcebe03748412b9ee47c78f80203ad65b65761e0", kill_on_drop: false }`
[INFO] [stderr]     Checking trie-generic v1.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `BTreeMap` is imported redundantly
[INFO] [stdout]    --> src/trie.rs:413:9
[INFO] [stdout]     |
[INFO] [stdout] 413 |     use std::collections::BTreeMap;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 414 |
[INFO] [stdout] 415 |     use super::*;
[INFO] [stdout]     |         -------- the item `BTreeMap` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LongestPrefFlags` is never constructed
[INFO] [stdout]   --> src/trie.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct LongestPrefFlags {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `LongestPrefResult` is never used
[INFO] [stdout]   --> src/trie.rs:39:6
[INFO] [stdout]    |
[INFO] [stdout] 39 | type LongestPrefResult = Option<(Vec<char>, LongestPrefFlags)>;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/trie.rs:82:8
[INFO] [stdout]     |
[INFO] [stdout] 81  | impl<'a, T: Display + Debug> TNode<'a, T> {
[INFO] [stdout]     | ----------------------------------------- methods in this implementation
[INFO] [stdout] 82  |     fn to_leaf(&mut self) {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 95  |     fn to_empty(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 122 |     fn is_childless(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 130 |     fn is_empty(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 138 |     fn content(&self) -> &Option<T> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 349 |     fn remove(&mut self, str_left: &'a str, remove_subtree: bool) -> bool {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 353 |     fn remove_fn(&mut self, str_left: &'a str, remove_subtree: bool) -> (bool, bool) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LongestPrefFlags` is never constructed
[INFO] [stdout]   --> src/trie.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct LongestPrefFlags {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `LongestPrefResult` is never used
[INFO] [stdout]   --> src/trie.rs:39:6
[INFO] [stdout]    |
[INFO] [stdout] 39 | type LongestPrefResult = Option<(Vec<char>, LongestPrefFlags)>;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_empty` is never used
[INFO] [stdout]   --> src/trie.rs:95:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | impl<'a, T: Display + Debug> TNode<'a, T> {
[INFO] [stdout]    | ----------------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 95 |     fn to_empty(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "fa1d75b9818ec5f5796b133fdcebe03748412b9ee47c78f80203ad65b65761e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa1d75b9818ec5f5796b133fdcebe03748412b9ee47c78f80203ad65b65761e0", kill_on_drop: false }`
[INFO] [stdout] fa1d75b9818ec5f5796b133fdcebe03748412b9ee47c78f80203ad65b65761e0
[INFO] checking trie-generic-1.1.8 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate trie-generic 1.1.8 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate trie-generic 1.1.8 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate trie-generic 1.1.8
[INFO] finished tweaking crates.io crate trie-generic 1.1.8
[INFO] tweaked toml for crates.io crate trie-generic 1.1.8 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate trie-generic 1.1.8 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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e441c78d5953a0a0979ee54de03bb50d473ba547307b20f682a11a39f3f4e1a5
[INFO] running `Command { std: "docker" "start" "-a" "e441c78d5953a0a0979ee54de03bb50d473ba547307b20f682a11a39f3f4e1a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e441c78d5953a0a0979ee54de03bb50d473ba547307b20f682a11a39f3f4e1a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e441c78d5953a0a0979ee54de03bb50d473ba547307b20f682a11a39f3f4e1a5", kill_on_drop: false }`
[INFO] [stdout] e441c78d5953a0a0979ee54de03bb50d473ba547307b20f682a11a39f3f4e1a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7510927db3b5269636567da15d3651827427054790a2783de207c5e24e8b783e
[INFO] running `Command { std: "docker" "start" "-a" "7510927db3b5269636567da15d3651827427054790a2783de207c5e24e8b783e", kill_on_drop: false }`
[INFO] [stderr]     Checking trie-generic v1.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `BTreeMap` is imported redundantly
[INFO] [stdout]    --> src/trie.rs:413:9
[INFO] [stdout]     |
[INFO] [stdout] 413 |     use std::collections::BTreeMap;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 414 |
[INFO] [stdout] 415 |     use super::*;
[INFO] [stdout]     |         -------- the item `BTreeMap` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/trie.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout] 148 | /             if self.is_terminal() {
[INFO] [stdout] 149 | |                 return Err(KeyExists);
[INFO] [stdout] 150 | |             } else {
[INFO] [stdout] 151 | |                 match self {
[INFO] [stdout] ...   |
[INFO] [stdout] 171 | |                 };
[INFO] [stdout] 172 | |             };
[INFO] [stdout]     | |_____________^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/trie.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout] 148 | /             if self.is_terminal() {
[INFO] [stdout] 149 | |                 return Err(KeyExists);
[INFO] [stdout] 150 | |             } else {
[INFO] [stdout] 151 | |                 match self {
[INFO] [stdout] ...   |
[INFO] [stdout] 171 | |                 };
[INFO] [stdout] 172 | |             };
[INFO] [stdout]     | |_____________^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `trie-generic` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `trie-generic` (lib test) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "7510927db3b5269636567da15d3651827427054790a2783de207c5e24e8b783e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7510927db3b5269636567da15d3651827427054790a2783de207c5e24e8b783e", kill_on_drop: false }`
[INFO] [stdout] 7510927db3b5269636567da15d3651827427054790a2783de207c5e24e8b783e