[INFO] cloning repository https://github.com/martinjonsson01/symbolic-differentiator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/martinjonsson01/symbolic-differentiator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartinjonsson01%2Fsymbolic-differentiator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartinjonsson01%2Fsymbolic-differentiator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5c562fb454e1657af3e1bb1ee2adc99f9e2a7b94
[INFO] checking martinjonsson01/symbolic-differentiator against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartinjonsson01%2Fsymbolic-differentiator" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/martinjonsson01/symbolic-differentiator
[INFO] finished tweaking git repo https://github.com/martinjonsson01/symbolic-differentiator
[INFO] tweaked toml for git repo https://github.com/martinjonsson01/symbolic-differentiator written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/martinjonsson01/symbolic-differentiator on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/martinjonsson01/symbolic-differentiator already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[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] e575b8dbccac6bbf5a074a4a268821abebf3d2a6676a3c072143100a38b69e05
[INFO] running `Command { std: "docker" "start" "-a" "e575b8dbccac6bbf5a074a4a268821abebf3d2a6676a3c072143100a38b69e05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e575b8dbccac6bbf5a074a4a268821abebf3d2a6676a3c072143100a38b69e05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e575b8dbccac6bbf5a074a4a268821abebf3d2a6676a3c072143100a38b69e05", kill_on_drop: false }`
[INFO] [stdout] e575b8dbccac6bbf5a074a4a268821abebf3d2a6676a3c072143100a38b69e05
[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] f8ff1a9fc7ed522606c3412dc775cf277c7bbf77c64cb5ace07011638843949c
[INFO] running `Command { std: "docker" "start" "-a" "f8ff1a9fc7ed522606c3412dc775cf277c7bbf77c64cb5ace07011638843949c", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling serde v1.0.144
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]    Compiling serde_json v1.0.85
[INFO] [stderr]     Checking regex-syntax v0.6.27
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[INFO] [stderr]     Checking itertools v0.10.3
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[INFO] [stderr]    Compiling anyhow v1.0.62
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]     Checking tint v1.0.1
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[INFO] [stderr]     Checking plotters v0.3.3
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]     Checking pretty_assertions v1.2.1
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling serde_derive v1.0.144
[INFO] [stderr]    Compiling clap_derive v3.2.17
[INFO] [stderr]    Compiling parameterized-macro v1.0.0
[INFO] [stderr]     Checking clap v3.2.17
[INFO] [stderr]     Checking clap-verbosity-flag v1.0.1
[INFO] [stderr]     Checking toml v0.5.9
[INFO] [stderr]     Checking serde-value v0.7.0
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking tinytemplate v1.2.1
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[INFO] [stderr]     Checking config v0.11.0
[INFO] [stderr]     Checking criterion v0.3.6
[INFO] [stderr]     Checking ptree v0.4.0
[INFO] [stderr]     Checking symbolic-differentiator v0.1.0 (/opt/rustwide/workdir/symbolic-differentiator-lib)
[INFO] [stdout] warning: unused import: `walk_composite`
[INFO] [stdout]  --> symbolic-differentiator-lib/src/interpreter/syntax/expression_tree.rs:4:28
[INFO] [stdout]   |
[INFO] [stdout] 4 |     walk_binary_operation, walk_composite, walk_unary_operation, SyntaxVisitor,
[INFO] [stdout]   |                            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]   --> symbolic-differentiator-lib/src/interpreter/operator.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl UnaryOperator {
[INFO] [stdout]    | ------------------ methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 30 |     fn associativity(&self) -> Associativity {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 34 |     fn precedence(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub(crate) fn precedence_eq(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     pub(crate) fn precedence_ne(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     pub(crate) fn precedence_gt(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     pub(crate) fn precedence_ge(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     pub(crate) fn precedence_lt(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 58 |     pub(crate) fn precedence_le(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `precedence_ne`, `precedence_ge`, and `precedence_lt` are never used
[INFO] [stdout]    --> symbolic-differentiator-lib/src/interpreter/operator.rs:103:19
[INFO] [stdout]     |
[INFO] [stdout]  70 | impl BinaryOperator {
[INFO] [stdout]     | ------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 103 |     pub(crate) fn precedence_ne(&self, other: &Self) -> bool {
[INFO] [stdout]     |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 111 |     pub(crate) fn precedence_ge(&self, other: &Self) -> bool {
[INFO] [stdout]     |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 115 |     pub(crate) fn precedence_lt(&self, other: &Self) -> bool {
[INFO] [stdout]     |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `child` is never used
[INFO] [stdout]   --> symbolic-differentiator-lib/src/interpreter/syntax/composite.rs:27:19
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl CompositeData {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub(crate) fn child(&self, which: CompositeChild) -> &[Node] {
[INFO] [stdout]    |                   ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking symbolic-differentiator-cli v0.1.0 (/opt/rustwide/workdir/symbolic-differentiator-cli)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> symbolic-differentiator-cli/src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     variable: String,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> symbolic-differentiator-cli/src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     variable: String,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `symbolic-differentiator-cli` (bin "symbolic-differentiator-cli" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `symbolic-differentiator-cli` (bin "symbolic-differentiator-cli") due to 1 previous error
[INFO] [stdout] warning: unused import: `walk_composite`
[INFO] [stdout]  --> symbolic-differentiator-lib/src/interpreter/syntax/expression_tree.rs:4:28
[INFO] [stdout]   |
[INFO] [stdout] 4 |     walk_binary_operation, walk_composite, walk_unary_operation, SyntaxVisitor,
[INFO] [stdout]   |                            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]   --> symbolic-differentiator-lib/src/interpreter/operator.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl UnaryOperator {
[INFO] [stdout]    | ------------------ methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 30 |     fn associativity(&self) -> Associativity {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 34 |     fn precedence(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub(crate) fn precedence_eq(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     pub(crate) fn precedence_ne(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     pub(crate) fn precedence_gt(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     pub(crate) fn precedence_ge(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     pub(crate) fn precedence_lt(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 58 |     pub(crate) fn precedence_le(&self, other: &Self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `child` is never used
[INFO] [stdout]   --> symbolic-differentiator-lib/src/interpreter/syntax/composite.rs:27:19
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl CompositeData {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub(crate) fn child(&self, which: CompositeChild) -> &[Node] {
[INFO] [stdout]    |                   ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f8ff1a9fc7ed522606c3412dc775cf277c7bbf77c64cb5ace07011638843949c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8ff1a9fc7ed522606c3412dc775cf277c7bbf77c64cb5ace07011638843949c", kill_on_drop: false }`
[INFO] [stdout] f8ff1a9fc7ed522606c3412dc775cf277c7bbf77c64cb5ace07011638843949c
