[INFO] cloning repository https://github.com/novoru/simia
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/novoru/simia" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnovoru%2Fsimia", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnovoru%2Fsimia'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] df2ac25c4b33f70f6c0e99003fe583f7e5654fb4
[INFO] checking novoru/simia against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnovoru%2Fsimia" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/novoru/simia on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/novoru/simia
[INFO] finished tweaking git repo https://github.com/novoru/simia
[INFO] tweaked toml for git repo https://github.com/novoru/simia written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/novoru/simia 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 12636d9df6c6ba152978babbc344467d76b78002a28ab87f1e17392161afe0a5
[INFO] running `Command { std: "docker" "start" "-a" "12636d9df6c6ba152978babbc344467d76b78002a28ab87f1e17392161afe0a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12636d9df6c6ba152978babbc344467d76b78002a28ab87f1e17392161afe0a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12636d9df6c6ba152978babbc344467d76b78002a28ab87f1e17392161afe0a5", kill_on_drop: false }`
[INFO] [stdout] 12636d9df6c6ba152978babbc344467d76b78002a28ab87f1e17392161afe0a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0be875711e9e4e845bcc41812ab43c224b4cc700537f95caa5305c997b2cbf32
[INFO] running `Command { std: "docker" "start" "-a" "0be875711e9e4e845bcc41812ab43c224b4cc700537f95caa5305c997b2cbf32", kill_on_drop: false }`
[INFO] [stderr]     Checking simia v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:63:16
[INFO] [stdout]    |
[INFO] [stdout] 63 |             'a'...'z' | 'A' ... 'Z' | '_' => {
[INFO] [stdout]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:63:29
[INFO] [stdout]    |
[INFO] [stdout] 63 |             'a'...'z' | 'A' ... 'Z' | '_' => {
[INFO] [stdout]    |                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |             '0' ... '9' => return Token {kind: TokenKind::Integer, literal: self.read_integer()},
[INFO] [stdout]    |                 ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ast`
[INFO] [stdout]  --> src/repl.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ast:: { Ast };
[INFO] [stdout]   |                    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenKind`
[INFO] [stdout]  --> src/repl.rs:5:21
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::token::{ TokenKind };
[INFO] [stdout]   |                     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lexier`
[INFO] [stdout]  --> src/eval.rs:4:22
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::lexier::{ Lexier };
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Parser`
[INFO] [stdout]  --> src/eval.rs:6:22
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::parser::{ Parser };
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenKind`
[INFO] [stdout]  --> src/eval.rs:7:21
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::token::{ TokenKind };
[INFO] [stdout]   |                     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/eval.rs:459:43
[INFO] [stdout]     |
[INFO] [stdout] 459 |         Object::Array { ref elements } => (&elements.len() - 1),
[INFO] [stdout]     |                                           ^                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 459 -         Object::Array { ref elements } => (&elements.len() - 1),
[INFO] [stdout] 459 +         Object::Array { ref elements } => &elements.len() - 1,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ast`
[INFO] [stdout]  --> src/builtins.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ast::{ Ast };
[INFO] [stdout]   |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:63:16
[INFO] [stdout]    |
[INFO] [stdout] 63 |             'a'...'z' | 'A' ... 'Z' | '_' => {
[INFO] [stdout]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:63:29
[INFO] [stdout]    |
[INFO] [stdout] 63 |             'a'...'z' | 'A' ... 'Z' | '_' => {
[INFO] [stdout]    |                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |             '0' ... '9' => return Token {kind: TokenKind::Integer, literal: self.read_integer()},
[INFO] [stdout]    |                 ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ast`
[INFO] [stdout]  --> src/repl.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ast:: { Ast };
[INFO] [stdout]   |                    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenKind`
[INFO] [stdout]  --> src/repl.rs:5:21
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::token::{ TokenKind };
[INFO] [stdout]   |                     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TokenKind`, `Token`
[INFO] [stdout]    --> src/parser.rs:901:26
[INFO] [stdout]     |
[INFO] [stdout] 901 |     use crate::token:: { TokenKind, Token};
[INFO] [stdout]     |                          ^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lexier`
[INFO] [stdout]  --> src/eval.rs:4:22
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::lexier::{ Lexier };
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Parser`
[INFO] [stdout]  --> src/eval.rs:6:22
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::parser::{ Parser };
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenKind`
[INFO] [stdout]  --> src/eval.rs:7:21
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::token::{ TokenKind };
[INFO] [stdout]   |                     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/eval.rs:459:43
[INFO] [stdout]     |
[INFO] [stdout] 459 |         Object::Array { ref elements } => (&elements.len() - 1),
[INFO] [stdout]     |                                           ^                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 459 -         Object::Array { ref elements } => (&elements.len() - 1),
[INFO] [stdout] 459 +         Object::Array { ref elements } => &elements.len() - 1,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ast`
[INFO] [stdout]  --> src/builtins.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ast::{ Ast };
[INFO] [stdout]   |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `position`
[INFO] [stdout]    --> src/lexier.rs:129:13
[INFO] [stdout]     |
[INFO] [stdout] 129 |         let position = self.position + 1;
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_position`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 |         let mut value = match self.parse_expression(Precedence::Lowest) {
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `left_exp` is never read
[INFO] [stdout]    --> src/parser.rs:184:17
[INFO] [stdout]     |
[INFO] [stdout] 184 |         let mut left_exp = Ast::Expression {
[INFO] [stdout]     |                 ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/parser.rs:461:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 --- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 461 |                 _ => return None,
[INFO] [stdout]     |                 ^ unreachable pattern
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ast`
[INFO] [stdout]    --> src/parser.rs:456:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_Ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:450:17
[INFO] [stdout]     |
[INFO] [stdout] 450 |             let mut statement = match self.parse_statement() {
[INFO] [stdout]     |                 ----^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string` is never read
[INFO] [stdout]   --> src/object.rs:53:25
[INFO] [stdout]    |
[INFO] [stdout] 53 |                 let mut string = String::new();
[INFO] [stdout]    |                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string` is never read
[INFO] [stdout]   --> src/object.rs:67:54
[INFO] [stdout]    |
[INFO] [stdout] 67 |             Object::Array { elements }   => {let mut string = String::new();
[INFO] [stdout]    |                                                      ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `position`
[INFO] [stdout]    --> src/lexier.rs:129:13
[INFO] [stdout]     |
[INFO] [stdout] 129 |         let position = self.position + 1;
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_position`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]    --> src/eval.rs:113:39
[INFO] [stdout]     |
[INFO] [stdout] 113 |         Ast::ArrayLiteral { elements, token } => {
[INFO] [stdout]     |                                       ^^^^^ help: try ignoring the field: `token: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `function`
[INFO] [stdout]    --> src/eval.rs:419:30
[INFO] [stdout]     |
[INFO] [stdout] 419 |     if let Object::Builtin { function } = builtins(value.clone()) {
[INFO] [stdout]     |                              ^^^^^^^^ help: try ignoring the field: `function: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 |         let mut value = match self.parse_expression(Precedence::Lowest) {
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `parse_call_arguments` and `parse_error` are never used
[INFO] [stdout]    --> src/parser.rs:555:8
[INFO] [stdout]     |
[INFO] [stdout] 42  | impl Parser {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 555 |     fn parse_call_arguments(&mut self) -> Vec<Box<Ast>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 679 |     fn parse_error(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval_statements` is never used
[INFO] [stdout]    --> src/eval.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn eval_statements(statements: Vec<Box<Ast>>, env: &mut Env) -> Option<Object> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `left_exp` is never read
[INFO] [stdout]    --> src/parser.rs:184:17
[INFO] [stdout]     |
[INFO] [stdout] 184 |         let mut left_exp = Ast::Expression {
[INFO] [stdout]     |                 ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/parser.rs:461:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 --- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 461 |                 _ => return None,
[INFO] [stdout]     |                 ^ unreachable pattern
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ast` should have a snake case name
[INFO] [stdout]    --> src/parser.rs:456:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 ^^^ help: convert the identifier to snake case: `ast`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ast`
[INFO] [stdout]    --> src/parser.rs:456:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_Ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:450:17
[INFO] [stdout]     |
[INFO] [stdout] 450 |             let mut statement = match self.parse_statement() {
[INFO] [stdout]     |                 ----^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/eval.rs:463:8
[INFO] [stdout]     |
[INFO] [stdout] 463 |     if idx < 0 || idx > max {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/parser.rs:994:13
[INFO] [stdout]     |
[INFO] [stdout] 994 |             _ => {
[INFO] [stdout]     |             ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]     --> src/parser.rs:1089:42
[INFO] [stdout]      |
[INFO] [stdout] 1089 |                     Ast::IfExpression  { ref token, ref condition, ref consequence, ref alternative } => {
[INFO] [stdout]      |                                          ^^^^^^^^^ help: try ignoring the field: `token: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alternative`
[INFO] [stdout]     --> src/parser.rs:1089:85
[INFO] [stdout]      |
[INFO] [stdout] 1089 |                     Ast::IfExpression  { ref token, ref condition, ref consequence, ref alternative } => {
[INFO] [stdout]      |                                                                                     ^^^^^^^^^^^^^^^ help: try ignoring the field: `alternative: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]     --> src/parser.rs:1129:42
[INFO] [stdout]      |
[INFO] [stdout] 1129 |                     Ast::IfExpression  { ref token, ref condition, ref consequence, ref alternative } => {
[INFO] [stdout]      |                                          ^^^^^^^^^ help: try ignoring the field: `token: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string` is never read
[INFO] [stdout]   --> src/object.rs:53:25
[INFO] [stdout]    |
[INFO] [stdout] 53 |                 let mut string = String::new();
[INFO] [stdout]    |                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string` is never read
[INFO] [stdout]   --> src/object.rs:67:54
[INFO] [stdout]    |
[INFO] [stdout] 67 |             Object::Array { elements }   => {let mut string = String::new();
[INFO] [stdout]    |                                                      ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]    --> src/eval.rs:113:39
[INFO] [stdout]     |
[INFO] [stdout] 113 |         Ast::ArrayLiteral { elements, token } => {
[INFO] [stdout]     |                                       ^^^^^ help: try ignoring the field: `token: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `function`
[INFO] [stdout]    --> src/eval.rs:419:30
[INFO] [stdout]     |
[INFO] [stdout] 419 |     if let Object::Builtin { function } = builtins(value.clone()) {
[INFO] [stdout]     |                              ^^^^^^^^ help: try ignoring the field: `function: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `parse_call_arguments` and `parse_error` are never used
[INFO] [stdout]    --> src/parser.rs:555:8
[INFO] [stdout]     |
[INFO] [stdout] 42  | impl Parser {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 555 |     fn parse_call_arguments(&mut self) -> Vec<Box<Ast>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 679 |     fn parse_error(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval_statements` is never used
[INFO] [stdout]    --> src/eval.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn eval_statements(statements: Vec<Box<Ast>>, env: &mut Env) -> Option<Object> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ast` should have a snake case name
[INFO] [stdout]    --> src/parser.rs:456:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 ^^^ help: convert the identifier to snake case: `ast`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/eval.rs:463:8
[INFO] [stdout]     |
[INFO] [stdout] 463 |     if idx < 0 || idx > max {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> tests/eval_test.rs:339:6
[INFO] [stdout]     |
[INFO] [stdout] 339 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> tests/eval_test.rs:379:38
[INFO] [stdout]     |
[INFO] [stdout] 379 |                     Object::String { value } => (),
[INFO] [stdout]     |                                      ^^^^^ help: try ignoring the field: `value: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `Command { std: "docker" "inspect" "0be875711e9e4e845bcc41812ab43c224b4cc700537f95caa5305c997b2cbf32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0be875711e9e4e845bcc41812ab43c224b4cc700537f95caa5305c997b2cbf32", kill_on_drop: false }`
[INFO] [stdout] 0be875711e9e4e845bcc41812ab43c224b4cc700537f95caa5305c997b2cbf32
[INFO] checking novoru/simia against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnovoru%2Fsimia" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/novoru/simia on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/novoru/simia
[INFO] finished tweaking git repo https://github.com/novoru/simia
[INFO] tweaked toml for git repo https://github.com/novoru/simia written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/novoru/simia 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 086c4f0715fac5189414e66bea28a2e0f73fce8b8a75f17750c779c896ac5eb3
[INFO] running `Command { std: "docker" "start" "-a" "086c4f0715fac5189414e66bea28a2e0f73fce8b8a75f17750c779c896ac5eb3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "086c4f0715fac5189414e66bea28a2e0f73fce8b8a75f17750c779c896ac5eb3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "086c4f0715fac5189414e66bea28a2e0f73fce8b8a75f17750c779c896ac5eb3", kill_on_drop: false }`
[INFO] [stdout] 086c4f0715fac5189414e66bea28a2e0f73fce8b8a75f17750c779c896ac5eb3
[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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 481194578a99ba826357be064cec12904bab6abe940807391ca6a28687a6d317
[INFO] running `Command { std: "docker" "start" "-a" "481194578a99ba826357be064cec12904bab6abe940807391ca6a28687a6d317", kill_on_drop: false }`
[INFO] [stderr]     Checking simia v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:63:16
[INFO] [stdout]    |
[INFO] [stdout] 63 |             'a'...'z' | 'A' ... 'Z' | '_' => {
[INFO] [stdout]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:63:29
[INFO] [stdout]    |
[INFO] [stdout] 63 |             'a'...'z' | 'A' ... 'Z' | '_' => {
[INFO] [stdout]    |                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |             '0' ... '9' => return Token {kind: TokenKind::Integer, literal: self.read_integer()},
[INFO] [stdout]    |                 ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ast`
[INFO] [stdout]  --> src/repl.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ast:: { Ast };
[INFO] [stdout]   |                    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenKind`
[INFO] [stdout]  --> src/repl.rs:5:21
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::token::{ TokenKind };
[INFO] [stdout]   |                     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lexier`
[INFO] [stdout]  --> src/eval.rs:4:22
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::lexier::{ Lexier };
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Parser`
[INFO] [stdout]  --> src/eval.rs:6:22
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::parser::{ Parser };
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenKind`
[INFO] [stdout]  --> src/eval.rs:7:21
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::token::{ TokenKind };
[INFO] [stdout]   |                     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/eval.rs:459:43
[INFO] [stdout]     |
[INFO] [stdout] 459 |         Object::Array { ref elements } => (&elements.len() - 1),
[INFO] [stdout]     |                                           ^                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 459 -         Object::Array { ref elements } => (&elements.len() - 1),
[INFO] [stdout] 459 +         Object::Array { ref elements } => &elements.len() - 1,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ast`
[INFO] [stdout]  --> src/builtins.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ast::{ Ast };
[INFO] [stdout]   |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:63:16
[INFO] [stdout]    |
[INFO] [stdout] 63 |             'a'...'z' | 'A' ... 'Z' | '_' => {
[INFO] [stdout]    |                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:63:29
[INFO] [stdout]    |
[INFO] [stdout] 63 |             'a'...'z' | 'A' ... 'Z' | '_' => {
[INFO] [stdout]    |                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/lexier.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |             '0' ... '9' => return Token {kind: TokenKind::Integer, literal: self.read_integer()},
[INFO] [stdout]    |                 ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ast`
[INFO] [stdout]  --> src/repl.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ast:: { Ast };
[INFO] [stdout]   |                    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenKind`
[INFO] [stdout]  --> src/repl.rs:5:21
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::token::{ TokenKind };
[INFO] [stdout]   |                     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TokenKind`, `Token`
[INFO] [stdout]    --> src/parser.rs:901:26
[INFO] [stdout]     |
[INFO] [stdout] 901 |     use crate::token:: { TokenKind, Token};
[INFO] [stdout]     |                          ^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lexier`
[INFO] [stdout]  --> src/eval.rs:4:22
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::lexier::{ Lexier };
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Parser`
[INFO] [stdout]  --> src/eval.rs:6:22
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::parser::{ Parser };
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenKind`
[INFO] [stdout]  --> src/eval.rs:7:21
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::token::{ TokenKind };
[INFO] [stdout]   |                     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/eval.rs:459:43
[INFO] [stdout]     |
[INFO] [stdout] 459 |         Object::Array { ref elements } => (&elements.len() - 1),
[INFO] [stdout]     |                                           ^                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 459 -         Object::Array { ref elements } => (&elements.len() - 1),
[INFO] [stdout] 459 +         Object::Array { ref elements } => &elements.len() - 1,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ast`
[INFO] [stdout]  --> src/builtins.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::ast::{ Ast };
[INFO] [stdout]   |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `position`
[INFO] [stdout]    --> src/lexier.rs:129:13
[INFO] [stdout]     |
[INFO] [stdout] 129 |         let position = self.position + 1;
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_position`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 |         let mut value = match self.parse_expression(Precedence::Lowest) {
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `left_exp` is never read
[INFO] [stdout]    --> src/parser.rs:184:17
[INFO] [stdout]     |
[INFO] [stdout] 184 |         let mut left_exp = Ast::Expression {
[INFO] [stdout]     |                 ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/parser.rs:461:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 --- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 461 |                 _ => return None,
[INFO] [stdout]     |                 ^ unreachable pattern
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ast`
[INFO] [stdout]    --> src/parser.rs:456:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_Ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:450:17
[INFO] [stdout]     |
[INFO] [stdout] 450 |             let mut statement = match self.parse_statement() {
[INFO] [stdout]     |                 ----^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string` is never read
[INFO] [stdout]   --> src/object.rs:53:25
[INFO] [stdout]    |
[INFO] [stdout] 53 |                 let mut string = String::new();
[INFO] [stdout]    |                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string` is never read
[INFO] [stdout]   --> src/object.rs:67:54
[INFO] [stdout]    |
[INFO] [stdout] 67 |             Object::Array { elements }   => {let mut string = String::new();
[INFO] [stdout]    |                                                      ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]    --> src/eval.rs:113:39
[INFO] [stdout]     |
[INFO] [stdout] 113 |         Ast::ArrayLiteral { elements, token } => {
[INFO] [stdout]     |                                       ^^^^^ help: try ignoring the field: `token: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `position`
[INFO] [stdout]    --> src/lexier.rs:129:13
[INFO] [stdout]     |
[INFO] [stdout] 129 |         let position = self.position + 1;
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_position`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `function`
[INFO] [stdout]    --> src/eval.rs:419:30
[INFO] [stdout]     |
[INFO] [stdout] 419 |     if let Object::Builtin { function } = builtins(value.clone()) {
[INFO] [stdout]     |                              ^^^^^^^^ help: try ignoring the field: `function: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `parse_call_arguments` and `parse_error` are never used
[INFO] [stdout]    --> src/parser.rs:555:8
[INFO] [stdout]     |
[INFO] [stdout] 42  | impl Parser {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 555 |     fn parse_call_arguments(&mut self) -> Vec<Box<Ast>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 679 |     fn parse_error(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval_statements` is never used
[INFO] [stdout]    --> src/eval.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn eval_statements(statements: Vec<Box<Ast>>, env: &mut Env) -> Option<Object> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ast` should have a snake case name
[INFO] [stdout]    --> src/parser.rs:456:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 ^^^ help: convert the identifier to snake case: `ast`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/eval.rs:463:8
[INFO] [stdout]     |
[INFO] [stdout] 463 |     if idx < 0 || idx > max {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 |         let mut value = match self.parse_expression(Precedence::Lowest) {
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `left_exp` is never read
[INFO] [stdout]    --> src/parser.rs:184:17
[INFO] [stdout]     |
[INFO] [stdout] 184 |         let mut left_exp = Ast::Expression {
[INFO] [stdout]     |                 ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/parser.rs:461:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 --- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 461 |                 _ => return None,
[INFO] [stdout]     |                 ^ unreachable pattern
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ast`
[INFO] [stdout]    --> src/parser.rs:456:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_Ast`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser.rs:450:17
[INFO] [stdout]     |
[INFO] [stdout] 450 |             let mut statement = match self.parse_statement() {
[INFO] [stdout]     |                 ----^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/parser.rs:994:13
[INFO] [stdout]     |
[INFO] [stdout] 994 |             _ => {
[INFO] [stdout]     |             ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]     --> src/parser.rs:1089:42
[INFO] [stdout]      |
[INFO] [stdout] 1089 |                     Ast::IfExpression  { ref token, ref condition, ref consequence, ref alternative } => {
[INFO] [stdout]      |                                          ^^^^^^^^^ help: try ignoring the field: `token: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alternative`
[INFO] [stdout]     --> src/parser.rs:1089:85
[INFO] [stdout]      |
[INFO] [stdout] 1089 |                     Ast::IfExpression  { ref token, ref condition, ref consequence, ref alternative } => {
[INFO] [stdout]      |                                                                                     ^^^^^^^^^^^^^^^ help: try ignoring the field: `alternative: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]     --> src/parser.rs:1129:42
[INFO] [stdout]      |
[INFO] [stdout] 1129 |                     Ast::IfExpression  { ref token, ref condition, ref consequence, ref alternative } => {
[INFO] [stdout]      |                                          ^^^^^^^^^ help: try ignoring the field: `token: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string` is never read
[INFO] [stdout]   --> src/object.rs:53:25
[INFO] [stdout]    |
[INFO] [stdout] 53 |                 let mut string = String::new();
[INFO] [stdout]    |                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `string` is never read
[INFO] [stdout]   --> src/object.rs:67:54
[INFO] [stdout]    |
[INFO] [stdout] 67 |             Object::Array { elements }   => {let mut string = String::new();
[INFO] [stdout]    |                                                      ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]    --> src/eval.rs:113:39
[INFO] [stdout]     |
[INFO] [stdout] 113 |         Ast::ArrayLiteral { elements, token } => {
[INFO] [stdout]     |                                       ^^^^^ help: try ignoring the field: `token: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `function`
[INFO] [stdout]    --> src/eval.rs:419:30
[INFO] [stdout]     |
[INFO] [stdout] 419 |     if let Object::Builtin { function } = builtins(value.clone()) {
[INFO] [stdout]     |                              ^^^^^^^^ help: try ignoring the field: `function: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `parse_call_arguments` and `parse_error` are never used
[INFO] [stdout]    --> src/parser.rs:555:8
[INFO] [stdout]     |
[INFO] [stdout] 42  | impl Parser {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 555 |     fn parse_call_arguments(&mut self) -> Vec<Box<Ast>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 679 |     fn parse_error(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval_statements` is never used
[INFO] [stdout]    --> src/eval.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn eval_statements(statements: Vec<Box<Ast>>, env: &mut Env) -> Option<Object> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ast` should have a snake case name
[INFO] [stdout]    --> src/parser.rs:456:17
[INFO] [stdout]     |
[INFO] [stdout] 456 |                 Ast    => {
[INFO] [stdout]     |                 ^^^ help: convert the identifier to snake case: `ast`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/eval.rs:463:8
[INFO] [stdout]     |
[INFO] [stdout] 463 |     if idx < 0 || idx > max {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> tests/eval_test.rs:339:6
[INFO] [stdout]     |
[INFO] [stdout] 339 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> tests/eval_test.rs:379:38
[INFO] [stdout]     |
[INFO] [stdout] 379 |                     Object::String { value } => (),
[INFO] [stdout]     |                                      ^^^^^ help: try ignoring the field: `value: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "481194578a99ba826357be064cec12904bab6abe940807391ca6a28687a6d317", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "481194578a99ba826357be064cec12904bab6abe940807391ca6a28687a6d317", kill_on_drop: false }`
[INFO] [stdout] 481194578a99ba826357be064cec12904bab6abe940807391ca6a28687a6d317