[INFO] cloning repository https://github.com/xchg-rax-rax/pop3_client_lib
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xchg-rax-rax/pop3_client_lib" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxchg-rax-rax%2Fpop3_client_lib", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxchg-rax-rax%2Fpop3_client_lib'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3878d0c207171427ee0deef75f29562f21a3009d
[INFO] checking xchg-rax-rax/pop3_client_lib against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxchg-rax-rax%2Fpop3_client_lib" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/xchg-rax-rax/pop3_client_lib
[INFO] finished tweaking git repo https://github.com/xchg-rax-rax/pop3_client_lib
[INFO] tweaked toml for git repo https://github.com/xchg-rax-rax/pop3_client_lib written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/xchg-rax-rax/pop3_client_lib on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/xchg-rax-rax/pop3_client_lib 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb31d29d720b82f15f10e3679f5a4775237e74f555c2420e86d97803db11f220
[INFO] running `Command { std: "docker" "start" "-a" "eb31d29d720b82f15f10e3679f5a4775237e74f555c2420e86d97803db11f220", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb31d29d720b82f15f10e3679f5a4775237e74f555c2420e86d97803db11f220", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb31d29d720b82f15f10e3679f5a4775237e74f555c2420e86d97803db11f220", kill_on_drop: false }`
[INFO] [stdout] eb31d29d720b82f15f10e3679f5a4775237e74f555c2420e86d97803db11f220
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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 -Dunmustuse_in_always_ok" "-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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 09360975061fba256a2f0a72a14ff3e8795dc5a082901c140805cbc52bd8dd1b
[INFO] running `Command { std: "docker" "start" "-a" "09360975061fba256a2f0a72a14ff3e8795dc5a082901c140805cbc52bd8dd1b", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]     Checking regex-syntax v0.8.5
[INFO] [stderr]     Checking md5 v0.7.0
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]     Checking regex-automata v0.4.9
[INFO] [stderr]     Checking regex v1.11.1
[INFO] [stderr]     Checking pop3_client_lib v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `headers` and `body` are never read
[INFO] [stdout]   --> src/lib.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | pub struct Message {
[INFO] [stdout]    |            ------- fields in this struct
[INFO] [stdout] 10 |     headers: HashMap<String, String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 11 |     body: Vec<String>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]   --> src/lib.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct MessageInfo {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 16 |     maildrop_number: u32,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 17 |     size: u32,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 18 |     origination_date: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 19 |     from: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 20 |     to: Option<String>,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 21 |     cc: Option<String>,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 22 |     bcc: Option<String>,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 23 |     subject: Option<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `noop` and `uidl` are never used
[INFO] [stdout]     --> src/lib.rs:937:8
[INFO] [stdout]      |
[INFO] [stdout]  826 | impl POP3ClientSessionAPI {
[INFO] [stdout]      | ------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  937 |     fn noop(&mut self) -> Result<(bool, String), String> {
[INFO] [stdout]      |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1039 |     fn uidl(&mut self, message_number: Option<u32>) -> Result<(bool, String), String> {
[INFO] [stdout]      |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `headers` and `body` are never read
[INFO] [stdout]   --> src/lib.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | pub struct Message {
[INFO] [stdout]    |            ------- fields in this struct
[INFO] [stdout] 10 |     headers: HashMap<String, String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 11 |     body: Vec<String>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]   --> src/lib.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct MessageInfo {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 16 |     maildrop_number: u32,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 17 |     size: u32,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 18 |     origination_date: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 19 |     from: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 20 |     to: Option<String>,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 21 |     cc: Option<String>,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 22 |     bcc: Option<String>,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 23 |     subject: Option<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `noop` and `uidl` are never used
[INFO] [stdout]     --> src/lib.rs:937:8
[INFO] [stdout]      |
[INFO] [stdout]  826 | impl POP3ClientSessionAPI {
[INFO] [stdout]      | ------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  937 |     fn noop(&mut self) -> Result<(bool, String), String> {
[INFO] [stdout]      |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 1039 |     fn uidl(&mut self, message_number: Option<u32>) -> Result<(bool, String), String> {
[INFO] [stdout]      |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/lib.rs:519:44
[INFO] [stdout]     |
[INFO] [stdout] 519 |             let field_name: String = match captures[0].parse() {
[INFO] [stdout]     |                                            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/lib.rs:525:45
[INFO] [stdout]     |
[INFO] [stdout] 525 |             let field_value: String = match captures[1].parse() {
[INFO] [stdout]     |                                             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/lib.rs:519:44
[INFO] [stdout]     |
[INFO] [stdout] 519 |             let field_name: String = match captures[0].parse() {
[INFO] [stdout]     |                                            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/lib.rs:525:45
[INFO] [stdout]     |
[INFO] [stdout] 525 |             let field_value: String = match captures[1].parse() {
[INFO] [stdout]     |                                             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pop3_client_lib` (lib test) due to 2 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `pop3_client_lib` (lib) due to 2 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "09360975061fba256a2f0a72a14ff3e8795dc5a082901c140805cbc52bd8dd1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09360975061fba256a2f0a72a14ff3e8795dc5a082901c140805cbc52bd8dd1b", kill_on_drop: false }`
[INFO] [stdout] 09360975061fba256a2f0a72a14ff3e8795dc5a082901c140805cbc52bd8dd1b
