[INFO] cloning repository https://github.com/soichiro121/Fluno-lang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/soichiro121/Fluno-lang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsoichiro121%2FFluno-lang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsoichiro121%2FFluno-lang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f1c006d88948f1cebd9904f3d03cf3513c29625c
[INFO] testing soichiro121/Fluno-lang against try#0abe69e6c16114311cc2700e972492e64d69c28f for pr-154065
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsoichiro121%2FFluno-lang" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
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[INFO] started tweaking git repo https://github.com/soichiro121/Fluno-lang
[INFO] finished tweaking git repo https://github.com/soichiro121/Fluno-lang
[INFO] tweaked toml for git repo https://github.com/soichiro121/Fluno-lang written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/soichiro121/Fluno-lang on toolchain 0abe69e6c16114311cc2700e972492e64d69c28f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/soichiro121/Fluno-lang 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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e99181ca67d14050559ceeb94ed64ec47519df91d42e674e86d3d0bd0c550a3f
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[INFO] running `Command { std: "docker" "rm" "-f" "e99181ca67d14050559ceeb94ed64ec47519df91d42e674e86d3d0bd0c550a3f", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6ce7e4586e2b69b3221e0162651f8ae12e709270b269c4f05ff80b790599a9bd
[INFO] running `Command { std: "docker" "start" "-a" "6ce7e4586e2b69b3221e0162651f8ae12e709270b269c4f05ff80b790599a9bd", kill_on_drop: false }`
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[INFO] [stderr]    Compiling statrs v0.18.0
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[INFO] [stderr]    Compiling fluno v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `call_span`
[INFO] [stdout]     --> src/vm/mod.rs:1936:29
[INFO] [stdout]      |
[INFO] [stdout] 1936 |                         let call_span = *call_span;
[INFO] [stdout]      |                             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_call_span`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/vm/mod.rs:3930:37
[INFO] [stdout]      |
[INFO] [stdout] 3930 |                         if let Some(mut map) = self.store.with_dict_mut(*handle, |d| {
[INFO] [stdout]      |                                     ----^^^
[INFO] [stdout]      |                                     |
[INFO] [stdout]      |                                     help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]     --> src/vm/mod.rs:3930:37
[INFO] [stdout]      |
[INFO] [stdout] 3930 |                         if let Some(mut map) = self.store.with_dict_mut(*handle, |d| {
[INFO] [stdout]      |                                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 15s
[INFO] running `Command { std: "docker" "inspect" "6ce7e4586e2b69b3221e0162651f8ae12e709270b269c4f05ff80b790599a9bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ce7e4586e2b69b3221e0162651f8ae12e709270b269c4f05ff80b790599a9bd", kill_on_drop: false }`
[INFO] [stdout] 6ce7e4586e2b69b3221e0162651f8ae12e709270b269c4f05ff80b790599a9bd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c2c8e63a7f55db0da762cf5638aeea3ac360f96df2e14c754afcdb056a755f71
[INFO] running `Command { std: "docker" "start" "-a" "c2c8e63a7f55db0da762cf5638aeea3ac360f96df2e14c754afcdb056a755f71", kill_on_drop: false }`
[INFO] [stderr]    Compiling zerocopy v0.8.27
[INFO] [stderr]    Compiling zerocopy-derive v0.8.27
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling ciborium-io v0.2.2
[INFO] [stderr]    Compiling regex-syntax v0.8.8
[INFO] [stderr]    Compiling plotters-backend v0.3.7
[INFO] [stderr]    Compiling rustix v1.1.2
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling cast v0.3.0
[INFO] [stderr]    Compiling linux-raw-sys v0.11.0
[INFO] [stderr]    Compiling rayon v1.11.0
[INFO] [stderr]    Compiling walkdir v2.5.0
[INFO] [stderr]    Compiling getrandom v0.3.4
[INFO] [stderr]    Compiling is-terminal v0.4.16
[INFO] [stderr]    Compiling anes v0.1.6
[INFO] [stderr]    Compiling oorandom v11.1.5
[INFO] [stderr]    Compiling plotters-svg v0.3.7
[INFO] [stderr]    Compiling plotters v0.3.7
[INFO] [stderr]    Compiling url v2.5.8
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling regex-automata v0.4.13
[INFO] [stderr]    Compiling lsp-types v0.94.1
[INFO] [stderr]    Compiling criterion-plot v0.5.0
[INFO] [stderr]    Compiling tempfile v3.23.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling half v2.7.1
[INFO] [stderr]    Compiling ciborium-ll v0.2.2
[INFO] [stderr]    Compiling regex v1.12.2
[INFO] [stderr]    Compiling ciborium v0.2.2
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling criterion v0.5.1
[INFO] [stderr]    Compiling rand_distr v0.4.3
[INFO] [stderr]    Compiling nalgebra v0.33.2
[INFO] [stderr]    Compiling ndarray-rand v0.15.0
[INFO] [stderr]    Compiling tower-lsp v0.20.0
[INFO] [stderr]    Compiling statrs v0.18.0
[INFO] [stderr]    Compiling fluno v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::ad::cpu_backend::NdarrayStorage`
[INFO] [stdout]    --> src/ad/optimizer.rs:370:9
[INFO] [stdout]     |
[INFO] [stdout] 370 |     use crate::ad::cpu_backend::NdarrayStorage;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ad::types::ADFloat`
[INFO] [stdout]    --> src/ad/optimizer.rs:458:13
[INFO] [stdout]     |
[INFO] [stdout] 458 |         use crate::ad::types::ADFloat;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y_id`
[INFO] [stdout]    --> src/ad/optimizer.rs:412:13
[INFO] [stdout]     |
[INFO] [stdout] 412 |         let y_id = match &y {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_y_id`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `call_span`
[INFO] [stdout]     --> src/vm/mod.rs:1936:29
[INFO] [stdout]      |
[INFO] [stdout] 1936 |                         let call_span = *call_span;
[INFO] [stdout]      |                             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_call_span`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/vm/mod.rs:3930:37
[INFO] [stdout]      |
[INFO] [stdout] 3930 |                         if let Some(mut map) = self.store.with_dict_mut(*handle, |d| {
[INFO] [stdout]      |                                     ----^^^
[INFO] [stdout]      |                                     |
[INFO] [stdout]      |                                     help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]     --> src/vm/mod.rs:3930:37
[INFO] [stdout]      |
[INFO] [stdout] 3930 |                         if let Some(mut map) = self.store.with_dict_mut(*handle, |d| {
[INFO] [stdout]      |                                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `call_span`
[INFO] [stdout]     --> src/vm/mod.rs:1936:29
[INFO] [stdout]      |
[INFO] [stdout] 1936 |                         let call_span = *call_span;
[INFO] [stdout]      |                             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_call_span`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/vm/mod.rs:3930:37
[INFO] [stdout]      |
[INFO] [stdout] 3930 |                         if let Some(mut map) = self.store.with_dict_mut(*handle, |d| {
[INFO] [stdout]      |                                     ----^^^
[INFO] [stdout]      |                                     |
[INFO] [stdout]      |                                     help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]     --> src/vm/mod.rs:3930:37
[INFO] [stdout]      |
[INFO] [stdout] 3930 |                         if let Some(mut map) = self.store.with_dict_mut(*handle, |d| {
[INFO] [stdout]      |                                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `weak_observer` is never read
[INFO] [stdout]   --> src/gc_cycle_tests.rs:55:62
[INFO] [stdout]    |
[INFO] [stdout] 55 |         let mut weak_observer: Option<Weak<RefCell<Node>>> = None;
[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: unused variable: `s2`
[INFO] [stdout]   --> src/gc_tests.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let s2 = s1.clone();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/gc_cycle_tests.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     struct Node {
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 7 |         value: i32,
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 54.06s
[INFO] running `Command { std: "docker" "inspect" "c2c8e63a7f55db0da762cf5638aeea3ac360f96df2e14c754afcdb056a755f71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2c8e63a7f55db0da762cf5638aeea3ac360f96df2e14c754afcdb056a755f71", kill_on_drop: false }`
[INFO] [stdout] c2c8e63a7f55db0da762cf5638aeea3ac360f96df2e14c754afcdb056a755f71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 957004a82e24b6fe2b228cce0a650899c38ffc73c8490c58fd33c6262c1cd10e
[INFO] running `Command { std: "docker" "start" "-a" "957004a82e24b6fe2b228cce0a650899c38ffc73c8490c58fd33c6262c1cd10e", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `call_span`
[INFO] [stderr]     --> src/vm/mod.rs:1936:29
[INFO] [stderr]      |
[INFO] [stderr] 1936 |                         let call_span = *call_span;
[INFO] [stderr]      |                             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_call_span`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/vm/mod.rs:3930:37
[INFO] [stderr]      |
[INFO] [stderr] 3930 |                         if let Some(mut map) = self.store.with_dict_mut(*handle, |d| {
[INFO] [stderr]      |                                     ----^^^
[INFO] [stderr]      |                                     |
[INFO] [stderr]      |                                     help: remove this `mut`
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `map`
[INFO] [stderr]     --> src/vm/mod.rs:3930:37
[INFO] [stderr]      |
[INFO] [stderr] 3930 |                         if let Some(mut map) = self.store.with_dict_mut(*handle, |d| {
[INFO] [stderr]      |                                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stderr] 
[INFO] [stderr] warning: `fluno` (lib) generated 3 warnings (run `cargo fix --lib -p fluno` to apply 3 suggestions)
[INFO] [stderr] warning: unused import: `crate::ad::cpu_backend::NdarrayStorage`
[INFO] [stderr]    --> src/ad/optimizer.rs:370:9
[INFO] [stderr]     |
[INFO] [stderr] 370 |     use crate::ad::cpu_backend::NdarrayStorage;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::ad::types::ADFloat`
[INFO] [stderr]    --> src/ad/optimizer.rs:458:13
[INFO] [stderr]     |
[INFO] [stderr] 458 |         use crate::ad::types::ADFloat;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y_id`
[INFO] [stderr]    --> src/ad/optimizer.rs:412:13
[INFO] [stderr]     |
[INFO] [stderr] 412 |         let y_id = match &y {
[INFO] [stderr]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_y_id`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `call_span`
[INFO] [stderr]     --> src/vm/mod.rs:1936:29
[INFO] [stderr]      |
[INFO] [stderr] 1936 |                         let call_span = *call_span;
[INFO] [stderr]      |                             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_call_span`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `weak_observer` is never read
[INFO] [stderr]   --> src/gc_cycle_tests.rs:55:62
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let mut weak_observer: Option<Weak<RefCell<Node>>> = None;
[INFO] [stderr]    |                                                              ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]   --> src/gc_tests.rs:37:13
[INFO] [stderr]    |
[INFO] [stderr] 37 |         let s2 = s1.clone();
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stderr] 
[INFO] [stderr] warning: field `value` is never read
[INFO] [stderr]  --> src/gc_cycle_tests.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     struct Node {
[INFO] [stderr]   |            ---- field in this struct
[INFO] [stderr] 7 |         value: i32,
[INFO] [stderr]   |         ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `fluno` (lib test) generated 9 warnings (2 duplicates) (run `cargo fix --lib -p fluno --tests` to apply 5 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.34s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/fluno-8139cff03e069ee9)
[INFO] [stdout] 
[INFO] [stdout] running 94 tests
[INFO] [stdout] test ad::backward::tests::test_lgamma_grad ... ok
[INFO] [stdout] test ad::backward::tests::test_custom_vjp ... ok
[INFO] [stdout] test ad::optimizer::tests::test_algebraic_simplification_mul_one ... ok
[INFO] [stdout] test ad::backward::tests::test_simple_gradient ... ok
[INFO] [stdout] test ad::optimizer::tests::test_algebraic_simplification_mul_zero ... ok
[INFO] [stdout] test ad::optimizer::tests::test_cse ... ok
[INFO] [stdout] test ad::optimizer::tests::test_double_negation ... ok
[INFO] [stdout] test ad::tensor::tests::test_lazy_tensor_eval ... ok
[INFO] [stdout] test ad::types::tests::test_concrete_arithmetic ... ok
[INFO] [stdout] test ad::optimizer::tests::test_constant_folding ... ok
[INFO] [stdout] test ad::optimizer::tests::test_tensor_fusion ... ok
[INFO] [stdout] test ad::types::tests::test_complex_expression ... ok
[INFO] [stdout] test ad::types::tests::test_gradient_add ... ok
[INFO] [stdout] test ad::types::tests::test_gradient_div ... ok
[INFO] [stdout] test ad::types::tests::test_gradient_exp ... ok
[INFO] [stderr] error: test failed, to rerun pass `--lib`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/deps/fluno-8139cff03e069ee9` (signal: 11, SIGSEGV: invalid memory reference)
[INFO] running `Command { std: "docker" "inspect" "957004a82e24b6fe2b228cce0a650899c38ffc73c8490c58fd33c6262c1cd10e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "957004a82e24b6fe2b228cce0a650899c38ffc73c8490c58fd33c6262c1cd10e", kill_on_drop: false }`
[INFO] [stdout] 957004a82e24b6fe2b228cce0a650899c38ffc73c8490c58fd33c6262c1cd10e
