[INFO] fetching crate metre 0.2.6...
[INFO] checking metre-0.2.6 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate metre 0.2.6 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate metre 0.2.6
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate metre 0.2.6
[INFO] tweaked toml for crates.io crate metre 0.2.6 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate metre 0.2.6 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 209 packages to latest compatible versions
[INFO] [stderr]       Adding thiserror v1.0.69 (available: v2.0.17)
[INFO] [stderr]       Adding toml v0.8.23 (available: v0.9.8)
[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-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] 0f29e4fcb3b234a168fd4ee296e891126ec498b47cb3b1a4d8d848606e3c6eae
[INFO] running `Command { std: "docker" "start" "-a" "0f29e4fcb3b234a168fd4ee296e891126ec498b47cb3b1a4d8d848606e3c6eae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f29e4fcb3b234a168fd4ee296e891126ec498b47cb3b1a4d8d848606e3c6eae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f29e4fcb3b234a168fd4ee296e891126ec498b47cb3b1a4d8d848606e3c6eae", kill_on_drop: false }`
[INFO] [stdout] 0f29e4fcb3b234a168fd4ee296e891126ec498b47cb3b1a4d8d848606e3c6eae
[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] fc1fc9a9b207699efe80d6d638c599c3ca75480e48af2ffa3e4db8e9f160133f
[INFO] running `Command { std: "docker" "start" "-a" "fc1fc9a9b207699efe80d6d638c599c3ca75480e48af2ffa3e4db8e9f160133f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling regex-syntax v0.8.8
[INFO] [stderr]    Compiling regex-syntax v0.6.29
[INFO] [stderr]     Checking winnow v0.7.13
[INFO] [stderr]    Compiling aho-corasick v1.1.4
[INFO] [stderr]    Compiling darling_core v0.20.11
[INFO] [stderr]     Checking toml_write v0.1.2
[INFO] [stderr]     Checking serde_json v1.0.145
[INFO] [stderr]    Compiling regex-automata v0.4.13
[INFO] [stderr]    Compiling darling_macro v0.20.11
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]    Compiling darling v0.20.11
[INFO] [stderr]     Checking toml_datetime v0.6.11
[INFO] [stderr]     Checking serde_spanned v0.6.9
[INFO] [stderr]     Checking toml_edit v0.22.27
[INFO] [stderr]    Compiling regex_static_impl v0.1.0
[INFO] [stderr]    Compiling regex_static_macro v0.1.0
[INFO] [stderr]    Compiling regex v1.12.2
[INFO] [stderr]     Checking toml v0.8.23
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling regex_static v0.1.1
[INFO] [stderr]    Compiling metre-macros v0.2.6
[INFO] [stderr]     Checking metre v0.2.6 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<std::option::Option<std::string::String>, Infallible>
[INFO] [stdout]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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]    --> 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
[INFO] running `Command { std: "docker" "inspect" "fc1fc9a9b207699efe80d6d638c599c3ca75480e48af2ffa3e4db8e9f160133f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc1fc9a9b207699efe80d6d638c599c3ca75480e48af2ffa3e4db8e9f160133f", kill_on_drop: false }`
[INFO] [stdout] fc1fc9a9b207699efe80d6d638c599c3ca75480e48af2ffa3e4db8e9f160133f
