[INFO] cloning repository https://github.com/bash/cauliflambda
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bash/cauliflambda" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbash%2Fcauliflambda", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbash%2Fcauliflambda'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 922e5413e9bf0b4f884c7464b74d2f4c755fc9b1
[INFO] building bash/cauliflambda against master#44f415c1d617ebc7b931a243b7b321ef8a6ca47c for pr-142134-abi-ast-error
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbash%2Fcauliflambda" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bash/cauliflambda on toolchain 44f415c1d617ebc7b931a243b7b321ef8a6ca47c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/bash/cauliflambda
[INFO] finished tweaking git repo https://github.com/bash/cauliflambda
[INFO] tweaked toml for git repo https://github.com/bash/cauliflambda written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/bash/cauliflambda 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" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating git repository `https://github.com/brendanzab/codespan`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded concolor-override v1.1.0
[INFO] [stderr]   Downloaded anstyle-stream v0.2.2
[INFO] [stderr]   Downloaded rustyline-derive v0.8.0
[INFO] [stderr]   Downloaded fmtastic v0.1.0
[INFO] [stderr]   Downloaded winnow v0.4.11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7ece39794f685a8b531c1ad74c95d23eb02e1109fd0191c5bfbe8980e96eadc
[INFO] running `Command { std: "docker" "start" "-a" "a7ece39794f685a8b531c1ad74c95d23eb02e1109fd0191c5bfbe8980e96eadc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7ece39794f685a8b531c1ad74c95d23eb02e1109fd0191c5bfbe8980e96eadc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7ece39794f685a8b531c1ad74c95d23eb02e1109fd0191c5bfbe8980e96eadc", kill_on_drop: false }`
[INFO] [stdout] a7ece39794f685a8b531c1ad74c95d23eb02e1109fd0191c5bfbe8980e96eadc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1b4ccb2dc92db07452fe0d6f781693ec88fbb2ed3e0d27af8e21721437950d3d
[INFO] running `Command { std: "docker" "start" "-a" "1b4ccb2dc92db07452fe0d6f781693ec88fbb2ed3e0d27af8e21721437950d3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.70
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling winnow v0.4.11
[INFO] [stderr]    Compiling fmtastic v0.1.0
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling trait-set v0.3.0
[INFO] [stderr]    Compiling cauliflambda v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/call_by_need.rs:99:14
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn deref<'a>(expr: Expression<'a>) -> Option<Expression<'a>> {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/call_by_need.rs:104:13
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn lift<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/call_by_need.rs:109:14
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn assoc<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expression` is never used
[INFO] [stdout]  --> src/call_by_need.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub enum Expression<'a> {
[INFO] [stdout]   |          ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Expression` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `value`, `answer`, and `evaluation_context` are never used
[INFO] [stdout]   --> src/call_by_need.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl<'a> Expression<'a> {
[INFO] [stdout]    | ----------------------- methods in this implementation
[INFO] [stdout] 14 |     pub fn value(&self) -> Option<Value<'a>> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn answer(&self) -> Option<Answer<'a>> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn evaluation_context(&self, hole: &Expression<'a>) -> Option<EvaluationContext<'a>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Abstraction` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct Abstraction<'a> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Abstraction` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Application` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub struct Application<'a> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Application` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Value` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:87:12
[INFO] [stdout]    |
[INFO] [stdout] 87 | pub struct Value<'a>(Abstraction<'a>);
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Answer` is never used
[INFO] [stdout]   --> src/call_by_need.rs:91:10
[INFO] [stdout]    |
[INFO] [stdout] 91 | pub enum Answer<'a> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Answer` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `deref` is never used
[INFO] [stdout]   --> src/call_by_need.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn deref<'a>(expr: Expression<'a>) -> Option<Expression<'a>> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lift` is never used
[INFO] [stdout]    --> src/call_by_need.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn lift<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `assoc` is never used
[INFO] [stdout]    --> src/call_by_need.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn assoc<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `EvaluationContext` is never used
[INFO] [stdout]    --> src/call_by_need.rs:118:6
[INFO] [stdout]     |
[INFO] [stdout] 118 | enum EvaluationContext<'a> {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `EvaluationContext` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.11s
[INFO] running `Command { std: "docker" "inspect" "1b4ccb2dc92db07452fe0d6f781693ec88fbb2ed3e0d27af8e21721437950d3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b4ccb2dc92db07452fe0d6f781693ec88fbb2ed3e0d27af8e21721437950d3d", kill_on_drop: false }`
[INFO] [stdout] 1b4ccb2dc92db07452fe0d6f781693ec88fbb2ed3e0d27af8e21721437950d3d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2de22312342e14d9c5a24a2538c174a94ee06a0dae0fe2f6b24964023a666a57
[INFO] running `Command { std: "docker" "start" "-a" "2de22312342e14d9c5a24a2538c174a94ee06a0dae0fe2f6b24964023a666a57", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/call_by_need.rs:99:14
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn deref<'a>(expr: Expression<'a>) -> Option<Expression<'a>> {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling cauliflambda v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/call_by_need.rs:104:13
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn lift<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/call_by_need.rs:109:14
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn assoc<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expression` is never used
[INFO] [stdout]  --> src/call_by_need.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub enum Expression<'a> {
[INFO] [stdout]   |          ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Expression` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `value`, `answer`, and `evaluation_context` are never used
[INFO] [stdout]   --> src/call_by_need.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl<'a> Expression<'a> {
[INFO] [stdout]    | ----------------------- methods in this implementation
[INFO] [stdout] 14 |     pub fn value(&self) -> Option<Value<'a>> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn answer(&self) -> Option<Answer<'a>> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn evaluation_context(&self, hole: &Expression<'a>) -> Option<EvaluationContext<'a>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Abstraction` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct Abstraction<'a> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Abstraction` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Application` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub struct Application<'a> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Application` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Value` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:87:12
[INFO] [stdout]    |
[INFO] [stdout] 87 | pub struct Value<'a>(Abstraction<'a>);
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Answer` is never used
[INFO] [stdout]   --> src/call_by_need.rs:91:10
[INFO] [stdout]    |
[INFO] [stdout] 91 | pub enum Answer<'a> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Answer` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `deref` is never used
[INFO] [stdout]   --> src/call_by_need.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn deref<'a>(expr: Expression<'a>) -> Option<Expression<'a>> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lift` is never used
[INFO] [stdout]    --> src/call_by_need.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn lift<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `assoc` is never used
[INFO] [stdout]    --> src/call_by_need.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn assoc<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `EvaluationContext` is never used
[INFO] [stdout]    --> src/call_by_need.rs:118:6
[INFO] [stdout]     |
[INFO] [stdout] 118 | enum EvaluationContext<'a> {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `EvaluationContext` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/call_by_need.rs:99:14
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn deref<'a>(expr: Expression<'a>) -> Option<Expression<'a>> {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/call_by_need.rs:104:13
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn lift<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/call_by_need.rs:109:14
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn assoc<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expression` is never used
[INFO] [stdout]  --> src/call_by_need.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub enum Expression<'a> {
[INFO] [stdout]   |          ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Expression` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `value`, `answer`, and `evaluation_context` are never used
[INFO] [stdout]   --> src/call_by_need.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl<'a> Expression<'a> {
[INFO] [stdout]    | ----------------------- methods in this implementation
[INFO] [stdout] 14 |     pub fn value(&self) -> Option<Value<'a>> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn answer(&self) -> Option<Answer<'a>> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn evaluation_context(&self, hole: &Expression<'a>) -> Option<EvaluationContext<'a>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Abstraction` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct Abstraction<'a> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Abstraction` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Application` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | pub struct Application<'a> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Application` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Value` is never constructed
[INFO] [stdout]   --> src/call_by_need.rs:87:12
[INFO] [stdout]    |
[INFO] [stdout] 87 | pub struct Value<'a>(Abstraction<'a>);
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Answer` is never used
[INFO] [stdout]   --> src/call_by_need.rs:91:10
[INFO] [stdout]    |
[INFO] [stdout] 91 | pub enum Answer<'a> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Answer` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `deref` is never used
[INFO] [stdout]   --> src/call_by_need.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn deref<'a>(expr: Expression<'a>) -> Option<Expression<'a>> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lift` is never used
[INFO] [stdout]    --> src/call_by_need.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn lift<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `assoc` is never used
[INFO] [stdout]    --> src/call_by_need.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn assoc<'a>(expr: Expression<'a>) -> Expression<'a> {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `EvaluationContext` is never used
[INFO] [stdout]    --> src/call_by_need.rs:118:6
[INFO] [stdout]     |
[INFO] [stdout] 118 | enum EvaluationContext<'a> {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `EvaluationContext` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `Command { std: "docker" "inspect" "2de22312342e14d9c5a24a2538c174a94ee06a0dae0fe2f6b24964023a666a57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2de22312342e14d9c5a24a2538c174a94ee06a0dae0fe2f6b24964023a666a57", kill_on_drop: false }`
[INFO] [stdout] 2de22312342e14d9c5a24a2538c174a94ee06a0dae0fe2f6b24964023a666a57