[INFO] fetching crate nop-json 2.0.5...
[INFO] checking nop-json-2.0.5 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate nop-json 2.0.5 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate nop-json 2.0.5
[INFO] finished tweaking crates.io crate nop-json 2.0.5
[INFO] tweaked toml for crates.io crate nop-json 2.0.5 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate nop-json 2.0.5 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]      Locking 7 packages to latest compatible versions
[INFO] [stderr]       Adding numtoa v0.2.4 (available: v0.3.1)
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2e8e4720c0edb2001bc324b66040fc316be566311bf9b69f2aedf4bf2cb61ed9
[INFO] running `Command { std: "docker" "start" "-a" "2e8e4720c0edb2001bc324b66040fc316be566311bf9b69f2aedf4bf2cb61ed9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2e8e4720c0edb2001bc324b66040fc316be566311bf9b69f2aedf4bf2cb61ed9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e8e4720c0edb2001bc324b66040fc316be566311bf9b69f2aedf4bf2cb61ed9", kill_on_drop: false }`
[INFO] [stdout] 2e8e4720c0edb2001bc324b66040fc316be566311bf9b69f2aedf4bf2cb61ed9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -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] 6fbbd5b59c73fd1e5e23b1639136097e4a1b06bea62208fc6040205c13a245ee
[INFO] running `Command { std: "docker" "start" "-a" "6fbbd5b59c73fd1e5e23b1639136097e4a1b06bea62208fc6040205c13a245ee", kill_on_drop: false }`
[INFO] [stderr]     Checking numtoa v0.2.4
[INFO] [stderr]     Checking read_iter v0.1.2
[INFO] [stderr]    Compiling nop-json-derive v2.0.5
[INFO] [stderr]     Checking nop-json v2.0.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: private item shadows public glob re-export
[INFO] [stdout]  --> src/write_to_json.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::debug_to_json::DebugToJson;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: the name `DebugToJson` in the macro namespace is supposed to be publicly re-exported here
[INFO] [stdout]  --> src/write_to_json.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub use nop_json_derive::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] note: but the private item here shadows it
[INFO] [stdout]  --> src/write_to_json.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::debug_to_json::DebugToJson;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   = note: `#[warn(hidden_glob_reexports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private item shadows public glob re-export
[INFO] [stdout]  --> src/write_to_json.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::debug_to_json::DebugToJson;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: the name `DebugToJson` in the macro namespace is supposed to be publicly re-exported here
[INFO] [stdout]  --> src/write_to_json.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub use nop_json_derive::*;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] note: but the private item here shadows it
[INFO] [stdout]  --> src/write_to_json.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::debug_to_json::DebugToJson;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   = note: `#[warn(hidden_glob_reexports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1169:4
[INFO] [stdout]      |
[INFO] [stdout] 1169 |             &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1169 |             let _ = &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1184:4
[INFO] [stdout]      |
[INFO] [stdout] 1184 |             &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1184 |             let _ = &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1200:4
[INFO] [stdout]      |
[INFO] [stdout] 1200 |             &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1200 |             let _ = &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2035:6
[INFO] [stdout]      |
[INFO] [stdout] 2035 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2035 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2039:6
[INFO] [stdout]      |
[INFO] [stdout] 2039 |             {    &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2039 |             {    let _ = &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2043:6
[INFO] [stdout]      |
[INFO] [stdout] 2043 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2043 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i128, Infallible>
[INFO] [stdout]    --> src/value.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |                         {    Self::try_from(i64::try_from(mantissa).map_err(|_| ())?.wrapping_neg()).map_err(|_| ())?
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 192 | impl_from_value_signed!(i128);
[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_from_value_signed` (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<i128, Infallible>
[INFO] [stdout]    --> src/value.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |                         {    Self::try_from(mantissa).map_err(|_| ())?
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 192 | impl_from_value_signed!(i128);
[INFO] [stdout]     | ----------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |                         {    Self::try_from(i64::try_from(mantissa).map_err(|_| ())?.wrapping_neg()).map_err(|_| ())?
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 193 | impl_from_value_signed!(i64);
[INFO] [stdout]     | ---------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<u128, Infallible>
[INFO] [stdout]    --> src/value.rs:167:24
[INFO] [stdout]     |
[INFO] [stdout] 167 |                         let mut result = Self::try_from(mantissa).map_err(|_| ())?;
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 | impl_from_value_unsigned!(u128);
[INFO] [stdout]     | ------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:167:24
[INFO] [stdout]     |
[INFO] [stdout] 167 |                         let mut result = Self::try_from(mantissa).map_err(|_| ())?;
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 199 | impl_from_value_unsigned!(u64);
[INFO] [stdout]     | ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:376:24
[INFO] [stdout]     |
[INFO] [stdout] 376 |                 {    Ok(Value::Number(i64::try_from(value).map_err(|_| ())?.wrapping_neg() as u64, 0, true))
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 396 | impl_from_value_signed!(i64);
[INFO] [stdout]     | ---------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:376:24
[INFO] [stdout]     |
[INFO] [stdout] 376 |                 {    Ok(Value::Number(i64::try_from(value).map_err(|_| ())?.wrapping_neg() as u64, 0, true))
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 397 | impl_from_value_signed!(i32);
[INFO] [stdout]     | ---------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:376:24
[INFO] [stdout]     |
[INFO] [stdout] 376 |                 {    Ok(Value::Number(i64::try_from(value).map_err(|_| ())?.wrapping_neg() as u64, 0, true))
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 398 | impl_from_value_signed!(i16);
[INFO] [stdout]     | ---------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:376:24
[INFO] [stdout]     |
[INFO] [stdout] 376 |                 {    Ok(Value::Number(i64::try_from(value).map_err(|_| ())?.wrapping_neg() as u64, 0, true))
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 399 | impl_from_value_signed!(i8);
[INFO] [stdout]     | --------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:389:23
[INFO] [stdout]     |
[INFO] [stdout] 389 |             {    Ok(Value::Number(value.try_into().map_err(|_| ())?, 0, false))
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 401 | impl_from_value_unsigned!(u64);
[INFO] [stdout]     | ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:389:23
[INFO] [stdout]     |
[INFO] [stdout] 389 |             {    Ok(Value::Number(value.try_into().map_err(|_| ())?, 0, false))
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 402 | impl_from_value_unsigned!(u32);
[INFO] [stdout]     | ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:389:23
[INFO] [stdout]     |
[INFO] [stdout] 389 |             {    Ok(Value::Number(value.try_into().map_err(|_| ())?, 0, false))
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 403 | impl_from_value_unsigned!(u16);
[INFO] [stdout]     | ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:389:23
[INFO] [stdout]     |
[INFO] [stdout] 389 |             {    Ok(Value::Number(value.try_into().map_err(|_| ())?, 0, false))
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 404 | impl_from_value_unsigned!(u8);
[INFO] [stdout]     | ----------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/debug_to_json.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 let _ = &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/escape.rs:17:18
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn escape(s: &str) -> Cow<str>
[INFO] [stdout]    |                  ^^^^     ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn escape(s: &str) -> Cow<'_, str>
[INFO] [stdout]    |                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/escape.rs:28:28
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn escape_bytes(bytes: &[u8]) -> Cow<[u8]>
[INFO] [stdout]    |                            ^^^^^     ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                            |
[INFO] [stdout]    |                            the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn escape_bytes(bytes: &[u8]) -> Cow<'_, [u8]>
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nop-json` (lib test) due to 13 previous errors; 10 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1169:4
[INFO] [stdout]      |
[INFO] [stdout] 1169 |             &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1169 |             let _ = &mut buffer[pos+len .. pos+len+e].copy_from_slice(&FORMAT_NUM_WIDTH_Z[0 .. e]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1184:4
[INFO] [stdout]      |
[INFO] [stdout] 1184 |             &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1184 |             let _ = &mut buffer[pos .. pos+e-len+2].copy_from_slice(&FORMAT_NUM_WIDTH_0Z[0 .. e-len+2]);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:1200:4
[INFO] [stdout]      |
[INFO] [stdout] 1200 |             &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1200 |             let _ = &mut buffer[len .. len+exponent_str.len()].copy_from_slice(exponent_str);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2035:6
[INFO] [stdout]      |
[INFO] [stdout] 2035 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2035 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"null");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2039:6
[INFO] [stdout]      |
[INFO] [stdout] 2039 |             {    &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2039 |             {    let _ = &mut self.buffer[0 .. 5].copy_from_slice(b"false");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/nop_json.rs:2043:6
[INFO] [stdout]      |
[INFO] [stdout] 2043 |             {    &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]      |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 2043 |             {    let _ = &mut self.buffer[0 .. 4].copy_from_slice(b"true");
[INFO] [stdout]      |                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<i128, Infallible>
[INFO] [stdout]    --> src/value.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |                         {    Self::try_from(i64::try_from(mantissa).map_err(|_| ())?.wrapping_neg()).map_err(|_| ())?
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 192 | impl_from_value_signed!(i128);
[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_from_value_signed` (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<i128, Infallible>
[INFO] [stdout]    --> src/value.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |                         {    Self::try_from(mantissa).map_err(|_| ())?
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 192 | impl_from_value_signed!(i128);
[INFO] [stdout]     | ----------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |                         {    Self::try_from(i64::try_from(mantissa).map_err(|_| ())?.wrapping_neg()).map_err(|_| ())?
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 193 | impl_from_value_signed!(i64);
[INFO] [stdout]     | ---------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<u128, Infallible>
[INFO] [stdout]    --> src/value.rs:167:24
[INFO] [stdout]     |
[INFO] [stdout] 167 |                         let mut result = Self::try_from(mantissa).map_err(|_| ())?;
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 | impl_from_value_unsigned!(u128);
[INFO] [stdout]     | ------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:167:24
[INFO] [stdout]     |
[INFO] [stdout] 167 |                         let mut result = Self::try_from(mantissa).map_err(|_| ())?;
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 199 | impl_from_value_unsigned!(u64);
[INFO] [stdout]     | ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:376:24
[INFO] [stdout]     |
[INFO] [stdout] 376 |                 {    Ok(Value::Number(i64::try_from(value).map_err(|_| ())?.wrapping_neg() as u64, 0, true))
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 396 | impl_from_value_signed!(i64);
[INFO] [stdout]     | ---------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:376:24
[INFO] [stdout]     |
[INFO] [stdout] 376 |                 {    Ok(Value::Number(i64::try_from(value).map_err(|_| ())?.wrapping_neg() as u64, 0, true))
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 397 | impl_from_value_signed!(i32);
[INFO] [stdout]     | ---------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:376:24
[INFO] [stdout]     |
[INFO] [stdout] 376 |                 {    Ok(Value::Number(i64::try_from(value).map_err(|_| ())?.wrapping_neg() as u64, 0, true))
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 398 | impl_from_value_signed!(i16);
[INFO] [stdout]     | ---------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<i64, Infallible>
[INFO] [stdout]    --> src/value.rs:376:24
[INFO] [stdout]     |
[INFO] [stdout] 376 |                 {    Ok(Value::Number(i64::try_from(value).map_err(|_| ())?.wrapping_neg() as u64, 0, true))
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 399 | impl_from_value_signed!(i8);
[INFO] [stdout]     | --------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_signed` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:389:23
[INFO] [stdout]     |
[INFO] [stdout] 389 |             {    Ok(Value::Number(value.try_into().map_err(|_| ())?, 0, false))
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 401 | impl_from_value_unsigned!(u64);
[INFO] [stdout]     | ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:389:23
[INFO] [stdout]     |
[INFO] [stdout] 389 |             {    Ok(Value::Number(value.try_into().map_err(|_| ())?, 0, false))
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 402 | impl_from_value_unsigned!(u32);
[INFO] [stdout]     | ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:389:23
[INFO] [stdout]     |
[INFO] [stdout] 389 |             {    Ok(Value::Number(value.try_into().map_err(|_| ())?, 0, false))
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 403 | impl_from_value_unsigned!(u16);
[INFO] [stdout]     | ------------------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (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<u64, Infallible>
[INFO] [stdout]    --> src/value.rs:389:23
[INFO] [stdout]     |
[INFO] [stdout] 389 |             {    Ok(Value::Number(value.try_into().map_err(|_| ())?, 0, false))
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 404 | impl_from_value_unsigned!(u8);
[INFO] [stdout]     | ----------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `impl_from_value_unsigned` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/debug_to_json.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 176 |                 let _ = &mut buffer[0 .. mantissa.len()].copy_from_slice(&mantissa);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/escape.rs:17:18
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn escape(s: &str) -> Cow<str>
[INFO] [stdout]    |                  ^^^^     ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn escape(s: &str) -> Cow<'_, str>
[INFO] [stdout]    |                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/escape.rs:28:28
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn escape_bytes(bytes: &[u8]) -> Cow<[u8]>
[INFO] [stdout]    |                            ^^^^^     ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                            |
[INFO] [stdout]    |                            the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn escape_bytes(bytes: &[u8]) -> Cow<'_, [u8]>
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nop-json` (lib) due to 13 previous errors; 10 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "6fbbd5b59c73fd1e5e23b1639136097e4a1b06bea62208fc6040205c13a245ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fbbd5b59c73fd1e5e23b1639136097e4a1b06bea62208fc6040205c13a245ee", kill_on_drop: false }`
[INFO] [stdout] 6fbbd5b59c73fd1e5e23b1639136097e4a1b06bea62208fc6040205c13a245ee
