[INFO] cloning repository https://github.com/maxastyler/scheme-llvm
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[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxastyler%2Fscheme-llvm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] def48bf96fb943e82aec56e4251ea63f11fd44a1
[INFO] checking maxastyler/scheme-llvm against master#bca37a20bd376ce3fd138e7cdee7fe704e0f8814 for pr-139493-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxastyler%2Fscheme-llvm" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/maxastyler/scheme-llvm
[INFO] finished tweaking git repo https://github.com/maxastyler/scheme-llvm
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[INFO] validating manifest of git repo https://github.com/maxastyler/scheme-llvm on toolchain bca37a20bd376ce3fd138e7cdee7fe704e0f8814
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/maxastyler/scheme-llvm 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" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded llvm-sys v170.0.1
[INFO] [stderr]   Downloaded inkwell_internals v0.9.0
[INFO] [stderr]   Downloaded regex-lite v0.1.5
[INFO] [stderr]   Downloaded inkwell v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "inspect" "dd031b7182cf106a7212d46f32cc56d5e83b7c2420cf3f41e8d7ad452bb2fd90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd031b7182cf106a7212d46f32cc56d5e83b7c2420cf3f41e8d7ad452bb2fd90", kill_on_drop: false }`
[INFO] [stdout] dd031b7182cf106a7212d46f32cc56d5e83b7c2420cf3f41e8d7ad452bb2fd90
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[INFO] [stdout] 51904522b9c7da115dd1e0dc44044d214ff92e2bc512b7029b498a18a1ca4ac5
[INFO] running `Command { std: "docker" "start" "-a" "51904522b9c7da115dd1e0dc44044d214ff92e2bc512b7029b498a18a1ca4ac5", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.21
[INFO] [stderr]    Compiling regex-lite v0.1.5
[INFO] [stderr]    Compiling inkwell v0.3.0
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]    Compiling anyhow v1.0.79
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling llvm-sys v170.0.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]    Compiling inkwell_internals v0.9.0
[INFO] [stderr]     Checking thiserror v1.0.56
[INFO] [stderr]     Checking scheme-llvm v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[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 imports: `FunctionType`, `module::Module`, and `values::FloatMathValue`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     module::Module,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 8 |     types::{BasicType, FunctionType},
[INFO] [stdout]   |                        ^^^^^^^^^^^^
[INFO] [stdout] 9 |     values::FloatMathValue,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str::Bytes`
[INFO] [stdout]  --> src/parser.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::str::Bytes;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `f_func` should have an upper camel case name
[INFO] [stdout]   --> src/main.rs:48:6
[INFO] [stdout]    |
[INFO] [stdout] 48 | type f_func = unsafe extern "C" fn() -> f64;
[INFO] [stdout]    |      ^^^^^^ help: convert the identifier to upper camel case: `FFunc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BasicType`
[INFO] [stdout]  --> src/main.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     types::{BasicType, FunctionType},
[INFO] [stdout]   |             ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/parser.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let mut split_index = input
[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 import: `std::collections::HashMap`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[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 imports: `FunctionType`, `module::Module`, and `values::FloatMathValue`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     module::Module,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 8 |     types::{BasicType, FunctionType},
[INFO] [stdout]   |                        ^^^^^^^^^^^^
[INFO] [stdout] 9 |     values::FloatMathValue,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str::Bytes`
[INFO] [stdout]  --> src/parser.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::str::Bytes;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `f_func` should have an upper camel case name
[INFO] [stdout]   --> src/main.rs:48:6
[INFO] [stdout]    |
[INFO] [stdout] 48 | type f_func = unsafe extern "C" fn() -> f64;
[INFO] [stdout]    |      ^^^^^^ help: convert the identifier to upper camel case: `FFunc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BasicType`
[INFO] [stdout]  --> src/main.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     types::{BasicType, FunctionType},
[INFO] [stdout]   |             ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `identifier`
[INFO] [stdout]   --> src/main.rs:26:34
[INFO] [stdout]    |
[INFO] [stdout] 26 |             Expression::Define { identifier, value } => todo!(),
[INFO] [stdout]    |                                  ^^^^^^^^^^ help: try ignoring the field: `identifier: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/main.rs:26:46
[INFO] [stdout]    |
[INFO] [stdout] 26 |             Expression::Define { identifier, value } => todo!(),
[INFO] [stdout]    |                                              ^^^^^ help: try ignoring the field: `value: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pairs`
[INFO] [stdout]   --> src/main.rs:27:31
[INFO] [stdout]    |
[INFO] [stdout] 27 |             Expression::Let { pairs, body } => todo!(),
[INFO] [stdout]    |                               ^^^^^ help: try ignoring the field: `pairs: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]   --> src/main.rs:27:38
[INFO] [stdout]    |
[INFO] [stdout] 27 |             Expression::Let { pairs, body } => todo!(),
[INFO] [stdout]    |                                      ^^^^ help: try ignoring the field: `body: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arguments`
[INFO] [stdout]   --> src/main.rs:28:34
[INFO] [stdout]    |
[INFO] [stdout] 28 |             Expression::Lambda { arguments, body } => todo!(),
[INFO] [stdout]    |                                  ^^^^^^^^^ help: try ignoring the field: `arguments: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]   --> src/main.rs:28:45
[INFO] [stdout]    |
[INFO] [stdout] 28 |             Expression::Lambda { arguments, body } => todo!(),
[INFO] [stdout]    |                                             ^^^^ help: try ignoring the field: `body: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/parser.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let mut split_index = input
[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: variant `Nil` is never constructed
[INFO] [stdout]  --> src/parser.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub enum Atom<'a> {
[INFO] [stdout]   |          ---- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 7 |     Nil,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Atom` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:39:21
[INFO] [stdout]    |
[INFO] [stdout] 39 |                     self.builder.build_return(Some(&f));
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[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] 39 |                     let _ = self.builder.build_return(Some(&f));
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `identifier`
[INFO] [stdout]   --> src/main.rs:26:34
[INFO] [stdout]    |
[INFO] [stdout] 26 |             Expression::Define { identifier, value } => todo!(),
[INFO] [stdout]    |                                  ^^^^^^^^^^ help: try ignoring the field: `identifier: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/main.rs:26:46
[INFO] [stdout]    |
[INFO] [stdout] 26 |             Expression::Define { identifier, value } => todo!(),
[INFO] [stdout]    |                                              ^^^^^ help: try ignoring the field: `value: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pairs`
[INFO] [stdout]   --> src/main.rs:27:31
[INFO] [stdout]    |
[INFO] [stdout] 27 |             Expression::Let { pairs, body } => todo!(),
[INFO] [stdout]    |                               ^^^^^ help: try ignoring the field: `pairs: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]   --> src/main.rs:27:38
[INFO] [stdout]    |
[INFO] [stdout] 27 |             Expression::Let { pairs, body } => todo!(),
[INFO] [stdout]    |                                      ^^^^ help: try ignoring the field: `body: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arguments`
[INFO] [stdout]   --> src/main.rs:28:34
[INFO] [stdout]    |
[INFO] [stdout] 28 |             Expression::Lambda { arguments, body } => todo!(),
[INFO] [stdout]    |                                  ^^^^^^^^^ help: try ignoring the field: `arguments: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]   --> src/main.rs:28:45
[INFO] [stdout]    |
[INFO] [stdout] 28 |             Expression::Lambda { arguments, body } => todo!(),
[INFO] [stdout]    |                                             ^^^^ help: try ignoring the field: `body: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Nil` is never constructed
[INFO] [stdout]  --> src/parser.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub enum Atom<'a> {
[INFO] [stdout]   |          ---- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 7 |     Nil,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Atom` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Define`, `Let`, `Lambda`, `Begin`, and `List` are never constructed
[INFO] [stdout]   --> src/parser.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub enum Expression<'a> {
[INFO] [stdout]    |          ---------- variants in this enum
[INFO] [stdout] 36 |     Define {
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |     Let {
[INFO] [stdout]    |     ^^^
[INFO] [stdout] ...
[INFO] [stdout] 44 |     Lambda {
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     Begin(Vec<Expression<'a>>),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 49 |     List(Vec<Expression<'a>>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Expression` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_identifier` is never used
[INFO] [stdout]   --> src/parser.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn parse_identifier<'a>(input: &'a str) -> Option<(&'a str, &'a str)> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_to_first_whitespace` is never used
[INFO] [stdout]   --> src/parser.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn split_to_first_whitespace<'a>(input: &'a str) -> Option<(&'a str, &'a str)> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_expression` is never used
[INFO] [stdout]   --> src/parser.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn parse_expression<'a>(input: &'a str) -> Option<(Expression<'a>, &'a str)> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_atom` is never used
[INFO] [stdout]   --> src/parser.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn parse_atom<'a>(input: &'a str) -> Option<(Atom<'a>, &'a str)> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_define` is never used
[INFO] [stdout]   --> src/parser.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn parse_define<'a>(input: &'a str) -> Option<(Expression<'a>, &'a str)> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_binding_pair` is never used
[INFO] [stdout]    --> src/parser.rs:103:4
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn parse_binding_pair<'a>(input: &'a str) -> Option<((&'a str, Expression<'a>), &'a str)> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_let` is never used
[INFO] [stdout]    --> src/parser.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn parse_let<'a>(input: &'a str) -> Option<(Expression<'a>, &'a str)> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_lambda` is never used
[INFO] [stdout]    --> src/parser.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn parse_lambda<'a>(input: &'a str) -> Option<(Expression<'a>, &'a str)> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_begin` is never used
[INFO] [stdout]    --> src/parser.rs:165:4
[INFO] [stdout]     |
[INFO] [stdout] 165 | fn parse_begin<'a>(input: &'a str) -> Option<(Expression<'a>, &'a str)> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_list` is never used
[INFO] [stdout]    --> src/parser.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 | pub fn parse_list<'a>(mut i: &'a str) -> Option<(Vec<Expression<'a>>, &'a str)> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bracketed` is never used
[INFO] [stdout]    --> src/parser.rs:192:4
[INFO] [stdout]     |
[INFO] [stdout] 192 | fn bracketed<'a, A, F>(f: F, input: &'a str) -> Option<(A, &'a str)>
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_bracketed` is never used
[INFO] [stdout]    --> src/parser.rs:202:4
[INFO] [stdout]     |
[INFO] [stdout] 202 | fn parse_bracketed<'a>(input: &'a str) -> Option<(Expression<'a>, &'a str)> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:39:21
[INFO] [stdout]    |
[INFO] [stdout] 39 |                     self.builder.build_return(Some(&f));
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[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] 39 |                     let _ = self.builder.build_return(Some(&f));
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.15s
[INFO] running `Command { std: "docker" "inspect" "51904522b9c7da115dd1e0dc44044d214ff92e2bc512b7029b498a18a1ca4ac5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "51904522b9c7da115dd1e0dc44044d214ff92e2bc512b7029b498a18a1ca4ac5", kill_on_drop: false }`
[INFO] [stdout] 51904522b9c7da115dd1e0dc44044d214ff92e2bc512b7029b498a18a1ca4ac5
