[INFO] cloning repository https://github.com/ramiroaisen/metre
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ramiroaisen/metre" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Framiroaisen%2Fmetre", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Framiroaisen%2Fmetre'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cbc47827e0e959fb39e27ced1bb2b0893723c8ce
[INFO] checking ramiroaisen/metre 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%2Framiroaisen%2Fmetre" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ramiroaisen/metre
[INFO] finished tweaking git repo https://github.com/ramiroaisen/metre
[INFO] tweaked toml for git repo https://github.com/ramiroaisen/metre written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ramiroaisen/metre 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/ramiroaisen/metre 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 4c311fe367f2b23ffc2c1fe36cdb4f4ac1cf487a64b23b5681844f5d366ba432
[INFO] running `Command { std: "docker" "start" "-a" "4c311fe367f2b23ffc2c1fe36cdb4f4ac1cf487a64b23b5681844f5d366ba432", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c311fe367f2b23ffc2c1fe36cdb4f4ac1cf487a64b23b5681844f5d366ba432", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c311fe367f2b23ffc2c1fe36cdb4f4ac1cf487a64b23b5681844f5d366ba432", kill_on_drop: false }`
[INFO] [stdout] 4c311fe367f2b23ffc2c1fe36cdb4f4ac1cf487a64b23b5681844f5d366ba432
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] c751581cdf55a59c4360be7e1b05aa51bbe32453d2889c523dc8107b10adc9b7
[INFO] running `Command { std: "docker" "start" "-a" "c751581cdf55a59c4360be7e1b05aa51bbe32453d2889c523dc8107b10adc9b7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.84
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling regex-syntax v0.6.29
[INFO] [stderr]    Compiling memchr v2.7.2
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]     Checking regex-syntax v0.8.3
[INFO] [stderr]     Checking winnow v0.6.9
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking ident_case v1.0.1
[INFO] [stderr]     Checking strsim v0.11.1
[INFO] [stderr]     Checking quote v1.0.36
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]     Checking owo-colors v4.0.0
[INFO] [stderr]     Checking syn v2.0.66
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking darling_core v0.20.9
[INFO] [stderr]    Compiling regex_static_impl v0.1.0
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]     Checking Inflector v0.11.4
[INFO] [stderr]    Compiling regex_static_macro v0.1.0
[INFO] [stderr]     Checking regex_static v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.203
[INFO] [stderr]    Compiling thiserror-impl v1.0.61
[INFO] [stderr]     Checking thiserror v1.0.61
[INFO] [stderr]    Compiling darling_macro v0.20.9
[INFO] [stderr]    Compiling darling v0.20.9
[INFO] [stderr]    Compiling metre-macros v0.2.6 (/opt/rustwide/workdir/metre-macros)
[INFO] [stderr]     Checking serde v1.0.203
[INFO] [stderr]     Checking toml_datetime v0.6.6
[INFO] [stderr]     Checking serde_spanned v0.6.6
[INFO] [stderr]     Checking serde_json v1.0.117
[INFO] [stderr]     Checking toml_edit v0.22.13
[INFO] [stderr]     Checking toml v0.8.13
[INFO] [stderr]     Checking metre v0.2.6 (/opt/rustwide/workdir/metre)
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> metre/src/error.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     source: Arc<std::io::Error>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> metre/src/error.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     source: Arc<serde_json::Error>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> metre/src/error.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 |     source: toml::de::Error,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 301 |   impl_env_provider_for_map!(HashMap<String, String>);
[INFO] [stdout]     |   --------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 301 | impl_env_provider_for_map!(HashMap<String, String>);
[INFO] [stdout]     | --------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 303 |   impl_env_provider_for_map!(HashMap<&str, String>);
[INFO] [stdout]     |   ------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 303 | impl_env_provider_for_map!(HashMap<&str, String>);
[INFO] [stdout]     | ------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 305 |   impl_env_provider_for_map!(HashMap<String, &str>);
[INFO] [stdout]     |   ------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 305 | impl_env_provider_for_map!(HashMap<String, &str>);
[INFO] [stdout]     | ------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 307 |   impl_env_provider_for_map!(HashMap<&str, &str>);
[INFO] [stdout]     |   ----------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 307 | impl_env_provider_for_map!(HashMap<&str, &str>);
[INFO] [stdout]     | ----------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 309 |   impl_env_provider_for_map!(BTreeMap<String, String>);
[INFO] [stdout]     |   ---------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 309 | impl_env_provider_for_map!(BTreeMap<String, String>);
[INFO] [stdout]     | ---------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 311 |   impl_env_provider_for_map!(BTreeMap<&str, String>);
[INFO] [stdout]     |   -------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 311 | impl_env_provider_for_map!(BTreeMap<&str, String>);
[INFO] [stdout]     | -------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 313 |   impl_env_provider_for_map!(BTreeMap<String, &str>);
[INFO] [stdout]     |   -------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 313 | impl_env_provider_for_map!(BTreeMap<String, &str>);
[INFO] [stdout]     | -------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 315 |   impl_env_provider_for_map!(BTreeMap<&str, &str>);
[INFO] [stdout]     |   ------------------------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 315 | impl_env_provider_for_map!(BTreeMap<&str, &str>);
[INFO] [stdout]     | ------------------------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `metre` (lib) due to 16 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> metre/src/error.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     source: Arc<std::io::Error>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> metre/src/error.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     source: Arc<serde_json::Error>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> metre/src/error.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 |     source: toml::de::Error,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 301 |   impl_env_provider_for_map!(HashMap<String, String>);
[INFO] [stdout]     |   --------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 301 | impl_env_provider_for_map!(HashMap<String, String>);
[INFO] [stdout]     | --------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 303 |   impl_env_provider_for_map!(HashMap<&str, String>);
[INFO] [stdout]     |   ------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 303 | impl_env_provider_for_map!(HashMap<&str, String>);
[INFO] [stdout]     | ------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 305 |   impl_env_provider_for_map!(HashMap<String, &str>);
[INFO] [stdout]     |   ------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 305 | impl_env_provider_for_map!(HashMap<String, &str>);
[INFO] [stdout]     | ------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 307 |   impl_env_provider_for_map!(HashMap<&str, &str>);
[INFO] [stdout]     |   ----------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 307 | impl_env_provider_for_map!(HashMap<&str, &str>);
[INFO] [stdout]     | ----------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 309 |   impl_env_provider_for_map!(BTreeMap<String, String>);
[INFO] [stdout]     |   ---------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 309 | impl_env_provider_for_map!(BTreeMap<String, String>);
[INFO] [stdout]     | ---------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 311 |   impl_env_provider_for_map!(BTreeMap<&str, String>);
[INFO] [stdout]     |   -------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 311 | impl_env_provider_for_map!(BTreeMap<&str, String>);
[INFO] [stdout]     | -------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 313 |   impl_env_provider_for_map!(BTreeMap<String, &str>);
[INFO] [stdout]     |   -------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 313 | impl_env_provider_for_map!(BTreeMap<String, &str>);
[INFO] [stdout]     | -------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:293:71
[INFO] [stdout]     |
[INFO] [stdout] 293 |         fn get(&self, key: &str) -> Result<Option<String>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 294 | |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout] 295 | |       }
[INFO] [stdout]     | |_______^
[INFO] [stdout] ...
[INFO] [stdout] 315 |   impl_env_provider_for_map!(BTreeMap<&str, &str>);
[INFO] [stdout]     |   ------------------------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> metre/src/lib.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         Ok(self.get(key).map(ToString::to_string))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 315 | impl_env_provider_for_map!(BTreeMap<&str, &str>);
[INFO] [stdout]     | ------------------------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_env_provider_for_map` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `metre` (lib test) due to 16 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "c751581cdf55a59c4360be7e1b05aa51bbe32453d2889c523dc8107b10adc9b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c751581cdf55a59c4360be7e1b05aa51bbe32453d2889c523dc8107b10adc9b7", kill_on_drop: false }`
[INFO] [stdout] c751581cdf55a59c4360be7e1b05aa51bbe32453d2889c523dc8107b10adc9b7
