[INFO] updating cached repository ANtlord/rtest
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ANtlord/rtest
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ANtlord/rtest" "work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/ANtlord/rtest"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/ANtlord/rtest'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ANtlord/rtest" "work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/ANtlord/rtest"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/ANtlord/rtest'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8dc929f821b55d5940f1d89c31bd4d889abb67eb
[INFO] sha for GitHub repo ANtlord/rtest: 8dc929f821b55d5940f1d89c31bd4d889abb67eb
[INFO] validating manifest of ANtlord/rtest on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ANtlord/rtest on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ANtlord/rtest
[INFO] finished frobbing ANtlord/rtest
[INFO] frobbed toml for ANtlord/rtest written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/ANtlord/rtest/Cargo.toml
[INFO] started frobbing ANtlord/rtest
[INFO] finished frobbing ANtlord/rtest
[INFO] frobbed toml for ANtlord/rtest written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/ANtlord/rtest/Cargo.toml
[INFO] crate ANtlord/rtest already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking ANtlord/rtest against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-3/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/ANtlord/rtest:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] cdc79581a3224d70e88eb4e9d0c1188a709e76e8beb47eacdbe98f154499affe
[INFO] running `"docker" "start" "-a" "cdc79581a3224d70e88eb4e9d0c1188a709e76e8beb47eacdbe98f154499affe"`
[INFO] [stderr]     Checking errno v0.2.3
[INFO] [stderr]     Checking hostname v0.1.3
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking serde_json v1.0.2
[INFO] [stderr]     Checking aho-corasick v0.6.3
[INFO] [stderr]     Checking thread_local v0.3.3
[INFO] [stderr]    Compiling openssl-sys v0.9.14
[INFO] [stderr]     Checking chrono v0.4.0
[INFO] [stderr]    Compiling openssl v0.9.14
[INFO] [stderr]     Checking regex v0.2.2
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking imap v0.3.2
[INFO] [stderr]     Checking iconv v0.0.1 (https://github.com/y-stm/rust-iconv#4bc8877c)
[INFO] [stderr]     Checking bson v0.9.0
[INFO] [stderr]     Checking rtest v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:5:13
[INFO] [stderr]   |
[INFO] [stderr] 5 | #[macro_use(bson, doc)]
[INFO] [stderr]   |             ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:5:19
[INFO] [stderr]   |
[INFO] [stderr] 5 | #[macro_use(bson, doc)]
[INFO] [stderr]   |                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/data_mining.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::str::FromStr`
[INFO] [stderr]  --> src/io.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::str::FromStr;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc::channel`
[INFO] [stderr]   --> src/account/mod.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::sync::mpsc::channel;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cell::RefCell`
[INFO] [stderr]   --> src/account/mod.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use std::cell::RefCell;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `folder`
[INFO] [stderr]   --> src/data_mining.rs:71:42
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn get_folder_content(&mut self, folder: &FolderData) -> Vec<String> {
[INFO] [stderr]    |                                          ^^^^^^ help: consider prefixing with an underscore: `_folder`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/account/mod.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |         let mut folder = self.folders.get_mut("INBOX").unwrap();
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `select`
[INFO] [stderr]   --> src/data_mining.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     pub fn select(&mut self, folder: &FolderData) -> Mailbox {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `search_new_messages`
[INFO] [stderr]   --> src/data_mining.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     pub fn search_new_messages(&mut self) -> Vec<String> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_folder_content`
[INFO] [stderr]   --> src/data_mining.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn get_folder_content(&mut self, folder: &FolderData) -> Vec<String> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `logout`
[INFO] [stderr]   --> src/data_mining.rs:78:5
[INFO] [stderr]    |
[INFO] [stderr] 78 |     pub fn logout(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `other`
[INFO] [stderr]    --> src/data_mining.rs:108:5
[INFO] [stderr]     |
[INFO] [stderr] 108 |     other: String,
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `serialize`
[INFO] [stderr]  --> src/io.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn serialize(mailbox: &Mailbox) -> Document {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `save`
[INFO] [stderr]   --> src/io.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn save(mailbox: &Mailbox) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `auth`
[INFO] [stderr]   --> src/account/mod.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     auth: Auth,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `sender`
[INFO] [stderr]   --> src/account/mod.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     sender: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `subject`
[INFO] [stderr]   --> src/account/mod.rs:41:5
[INFO] [stderr]    |
[INFO] [stderr] 41 |     subject: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/account/mod.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |         handle.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:5:13
[INFO] [stderr]   |
[INFO] [stderr] 5 | #[macro_use(bson, doc)]
[INFO] [stderr]   |             ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:5:19
[INFO] [stderr]   |
[INFO] [stderr] 5 | #[macro_use(bson, doc)]
[INFO] [stderr]   |                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Deref`
[INFO] [stderr]  --> src/data_mining.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::ops::Deref;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::str::FromStr`
[INFO] [stderr]  --> src/io.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::str::FromStr;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc::channel`
[INFO] [stderr]   --> src/account/mod.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::sync::mpsc::channel;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cell::RefCell`
[INFO] [stderr]   --> src/account/mod.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use std::cell::RefCell;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `folder`
[INFO] [stderr]   --> src/data_mining.rs:71:42
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn get_folder_content(&mut self, folder: &FolderData) -> Vec<String> {
[INFO] [stderr]    |                                          ^^^^^^ help: consider prefixing with an underscore: `_folder`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/account/mod.rs:99:13
[INFO] [stderr]    |
[INFO] [stderr] 99 |         let mut folder = self.folders.get_mut("INBOX").unwrap();
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `select`
[INFO] [stderr]   --> src/data_mining.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     pub fn select(&mut self, folder: &FolderData) -> Mailbox {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `search_new_messages`
[INFO] [stderr]   --> src/data_mining.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     pub fn search_new_messages(&mut self) -> Vec<String> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_folder_content`
[INFO] [stderr]   --> src/data_mining.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn get_folder_content(&mut self, folder: &FolderData) -> Vec<String> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `logout`
[INFO] [stderr]   --> src/data_mining.rs:78:5
[INFO] [stderr]    |
[INFO] [stderr] 78 |     pub fn logout(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `other`
[INFO] [stderr]    --> src/data_mining.rs:108:5
[INFO] [stderr]     |
[INFO] [stderr] 108 |     other: String,
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `serialize`
[INFO] [stderr]  --> src/io.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn serialize(mailbox: &Mailbox) -> Document {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `save`
[INFO] [stderr]   --> src/io.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn save(mailbox: &Mailbox) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `auth`
[INFO] [stderr]   --> src/account/mod.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     auth: Auth,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `sender`
[INFO] [stderr]   --> src/account/mod.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     sender: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `subject`
[INFO] [stderr]   --> src/account/mod.rs:41:5
[INFO] [stderr]    |
[INFO] [stderr] 41 |     subject: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/account/mod.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |         handle.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 21.23s
[INFO] running `"docker" "inspect" "cdc79581a3224d70e88eb4e9d0c1188a709e76e8beb47eacdbe98f154499affe"`
[INFO] running `"docker" "rm" "-f" "cdc79581a3224d70e88eb4e9d0c1188a709e76e8beb47eacdbe98f154499affe"`
[INFO] [stdout] cdc79581a3224d70e88eb4e9d0c1188a709e76e8beb47eacdbe98f154499affe