[INFO] fetching crate walc_model 0.5.2...
[INFO] linting walc_model-0.5.2 against nightly for clippy-nonminimal_bool-denied
[INFO] extracting crate walc_model 0.5.2 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate walc_model 0.5.2
[INFO] finished tweaking crates.io crate walc_model 0.5.2
[INFO] tweaked toml for crates.io crate walc_model 0.5.2 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate walc_model 0.5.2 on toolchain nightly
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 7 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 318219cb8dc942e2aafb7bc98ead5209413dbade91c0a13a45529e38283315f8
[INFO] running `Command { std: "docker" "start" "-a" "318219cb8dc942e2aafb7bc98ead5209413dbade91c0a13a45529e38283315f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "318219cb8dc942e2aafb7bc98ead5209413dbade91c0a13a45529e38283315f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "318219cb8dc942e2aafb7bc98ead5209413dbade91c0a13a45529e38283315f8", kill_on_drop: false }`
[INFO] [stdout] 318219cb8dc942e2aafb7bc98ead5209413dbade91c0a13a45529e38283315f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "clippy" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f29e0812c885ef151eb39382c8da77f2bf584a808133d41f1dcc215fbe385b9
[INFO] running `Command { std: "docker" "start" "-a" "1f29e0812c885ef151eb39382c8da77f2bf584a808133d41f1dcc215fbe385b9", kill_on_drop: false }`
[INFO] [stderr]     Checking walc_model v0.5.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `interpret` is never used
[INFO] [stdout]  --> src/ast/treewalk_interpreter.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn interpret(ast: &ASTNode) -> Result<f64, String> {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `PUSH` contains a capitalized acronym
[INFO] [stdout]  --> src/bytecode/bytecode_interpreter.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     PUSH,
[INFO] [stdout]   |     ^^^^ help: consider making the acronym lowercase, except the initial letter: `Push`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout]   = note: `#[warn(clippy::upper_case_acronyms)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `ADD` contains a capitalized acronym
[INFO] [stdout]  --> src/bytecode/bytecode_interpreter.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ADD,
[INFO] [stdout]   |     ^^^ help: consider making the acronym lowercase, except the initial letter: `Add`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `SUBTRACT` contains a capitalized acronym
[INFO] [stdout]  --> src/bytecode/bytecode_interpreter.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     SUBTRACT,
[INFO] [stdout]   |     ^^^^^^^^ help: consider making the acronym lowercase, except the initial letter: `Subtract`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `MULTIPLY` contains a capitalized acronym
[INFO] [stdout]   --> src/bytecode/bytecode_interpreter.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     MULTIPLY,
[INFO] [stdout]    |     ^^^^^^^^ help: consider making the acronym lowercase, except the initial letter: `Multiply`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `DIVIDE` contains a capitalized acronym
[INFO] [stdout]   --> src/bytecode/bytecode_interpreter.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     DIVIDE,
[INFO] [stdout]    |     ^^^^^^ help: consider making the acronym lowercase, except the initial letter: `Divide`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `EXP` contains a capitalized acronym
[INFO] [stdout]   --> src/bytecode/bytecode_interpreter.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     EXP,
[INFO] [stdout]    |     ^^^ help: consider making the acronym lowercase, except the initial letter: `Exp`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
[INFO] [stdout]   --> src/bytecode/bytecode_interpreter.rs:48:25
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub fn interpret(bytes: &Vec<u8>) -> Result<f64, String> {
[INFO] [stdout]    |                         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout]    = note: `#[warn(clippy::ptr_arg)]` on by default
[INFO] [stdout] help: change this to
[INFO] [stdout]    |
[INFO] [stdout] 48 - pub fn interpret(bytes: &Vec<u8>) -> Result<f64, String> {
[INFO] [stdout] 48 + pub fn interpret(bytes: &[u8]) -> Result<f64, String> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module has the same name as its containing module
[INFO] [stdout]   --> src/lib.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub mod ast;
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#module_inception
[INFO] [stdout]    = note: `#[warn(clippy::module_inception)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded unit return type
[INFO] [stdout]   --> src/ast/ast.rs:22:55
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn postorder_traverse<Visitor: FnMut(&ASTNode) -> ()>(&self, visit_fn: &mut Visitor) {
[INFO] [stdout]    |                                                       ^^^^^^ help: remove the `-> ()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stdout]    = note: `#[warn(clippy::unused_unit)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]   --> src/ast/ast.rs:36:18
[INFO] [stdout]    |
[INFO] [stdout] 36 |         visit_fn(&self);
[INFO] [stdout]    |                  ^^^^^ help: change this to: `self`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout]    = note: `#[warn(clippy::needless_borrow)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/ast/treewalk_interpreter.rs:36:25
[INFO] [stdout]    |
[INFO] [stdout] 36 |                         return
[INFO] [stdout]    |                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]    = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 35 -                         errors.push_str("Internal error: invalid token.\n");
[INFO] [stdout] 36 -                         return
[INFO] [stdout] 35 +                         errors.push_str("Internal error: invalid token.\n");
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `EOF` contains a capitalized acronym
[INFO] [stdout]   --> src/frontend/lexer.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     EOF,
[INFO] [stdout]    |     ^^^ help: consider making the acronym lowercase, except the initial letter (notice the capitalization): `Eof`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `PUSH` contains a capitalized acronym
[INFO] [stdout]  --> src/bytecode/bytecode_interpreter.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     PUSH,
[INFO] [stdout]   |     ^^^^ help: consider making the acronym lowercase, except the initial letter: `Push`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout]   = note: `#[warn(clippy::upper_case_acronyms)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `ADD` contains a capitalized acronym
[INFO] [stdout]  --> src/bytecode/bytecode_interpreter.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ADD,
[INFO] [stdout]   |     ^^^ help: consider making the acronym lowercase, except the initial letter: `Add`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `SUBTRACT` contains a capitalized acronym
[INFO] [stdout]  --> src/bytecode/bytecode_interpreter.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     SUBTRACT,
[INFO] [stdout]   |     ^^^^^^^^ help: consider making the acronym lowercase, except the initial letter: `Subtract`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `MULTIPLY` contains a capitalized acronym
[INFO] [stdout]   --> src/bytecode/bytecode_interpreter.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     MULTIPLY,
[INFO] [stdout]    |     ^^^^^^^^ help: consider making the acronym lowercase, except the initial letter: `Multiply`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `DIVIDE` contains a capitalized acronym
[INFO] [stdout]   --> src/bytecode/bytecode_interpreter.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     DIVIDE,
[INFO] [stdout]    |     ^^^^^^ help: consider making the acronym lowercase, except the initial letter: `Divide`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `EXP` contains a capitalized acronym
[INFO] [stdout]   --> src/bytecode/bytecode_interpreter.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     EXP,
[INFO] [stdout]    |     ^^^ help: consider making the acronym lowercase, except the initial letter: `Exp`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
[INFO] [stdout]   --> src/bytecode/bytecode_interpreter.rs:48:25
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub fn interpret(bytes: &Vec<u8>) -> Result<f64, String> {
[INFO] [stdout]    |                         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout]    = note: `#[warn(clippy::ptr_arg)]` on by default
[INFO] [stdout] help: change this to
[INFO] [stdout]    |
[INFO] [stdout] 48 - pub fn interpret(bytes: &Vec<u8>) -> Result<f64, String> {
[INFO] [stdout] 48 + pub fn interpret(bytes: &[u8]) -> Result<f64, String> {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/frontend/parser.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert!(lexemes.len() > 0);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!lexemes.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout]    = note: `#[warn(clippy::len_zero)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/frontend/parser.rs:64:16
[INFO] [stdout]    |
[INFO] [stdout] 64 |             if !left.is_err() && !right.is_err() {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^ help: try: `left.is_ok()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]    = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/frontend/parser.rs:64:34
[INFO] [stdout]    |
[INFO] [stdout] 64 |             if !left.is_err() && !right.is_err() {
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^ help: try: `right.is_ok()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/frontend/parser.rs:107:16
[INFO] [stdout]     |
[INFO] [stdout] 107 |             if !left.is_err() && !right.is_err() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^ help: try: `left.is_ok()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/frontend/parser.rs:107:34
[INFO] [stdout]     |
[INFO] [stdout] 107 |             if !left.is_err() && !right.is_err() {
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^ help: try: `right.is_ok()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/frontend/parser.rs:150:16
[INFO] [stdout]     |
[INFO] [stdout] 150 |             if !root_expression.is_err() && !right.is_err() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `root_expression.is_ok()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/frontend/parser.rs:150:45
[INFO] [stdout]     |
[INFO] [stdout] 150 |             if !root_expression.is_err() && !right.is_err() {
[INFO] [stdout]     |                                             ^^^^^^^^^^^^^^^ help: try: `right.is_ok()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module has the same name as its containing module
[INFO] [stdout]   --> src/lib.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub mod ast;
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#module_inception
[INFO] [stdout]    = note: `#[warn(clippy::module_inception)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/lib.rs:30:38
[INFO] [stdout]    |
[INFO] [stdout] 30 |         Err(lex_error) => return Err(String::from(lex_error)),
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `lex_error`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout]    = note: `#[warn(clippy::useless_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/lib.rs:34:46
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Some(Err(parse_error)) => return Err(String::from(parse_error)),
[INFO] [stdout]    |                                              ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `parse_error`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/lib.rs:40:35
[INFO] [stdout]    |
[INFO] [stdout] 40 |         Err(runtime_error) => Err(String::from(runtime_error))
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `runtime_error`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded unit return type
[INFO] [stdout]   --> src/ast/ast.rs:22:55
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn postorder_traverse<Visitor: FnMut(&ASTNode) -> ()>(&self, visit_fn: &mut Visitor) {
[INFO] [stdout]    |                                                       ^^^^^^ help: remove the `-> ()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stdout]    = note: `#[warn(clippy::unused_unit)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]   --> src/ast/ast.rs:36:18
[INFO] [stdout]    |
[INFO] [stdout] 36 |         visit_fn(&self);
[INFO] [stdout]    |                  ^^^^^ help: change this to: `self`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout]    = note: `#[warn(clippy::needless_borrow)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/ast/treewalk_interpreter.rs:36:25
[INFO] [stdout]    |
[INFO] [stdout] 36 |                         return
[INFO] [stdout]    |                         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]    = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 35 -                         errors.push_str("Internal error: invalid token.\n");
[INFO] [stdout] 36 -                         return
[INFO] [stdout] 35 +                         errors.push_str("Internal error: invalid token.\n");
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `EOF` contains a capitalized acronym
[INFO] [stdout]   --> src/frontend/lexer.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     EOF,
[INFO] [stdout]    |     ^^^ help: consider making the acronym lowercase, except the initial letter (notice the capitalization): `Eof`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/frontend/parser.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |     assert!(lexemes.len() > 0);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!lexemes.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout]    = note: `#[warn(clippy::len_zero)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/frontend/parser.rs:64:16
[INFO] [stdout]    |
[INFO] [stdout] 64 |             if !left.is_err() && !right.is_err() {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^ help: try: `left.is_ok()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]    = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/frontend/parser.rs:64:34
[INFO] [stdout]    |
[INFO] [stdout] 64 |             if !left.is_err() && !right.is_err() {
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^ help: try: `right.is_ok()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/frontend/parser.rs:107:16
[INFO] [stdout]     |
[INFO] [stdout] 107 |             if !left.is_err() && !right.is_err() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^ help: try: `left.is_ok()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/frontend/parser.rs:107:34
[INFO] [stdout]     |
[INFO] [stdout] 107 |             if !left.is_err() && !right.is_err() {
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^ help: try: `right.is_ok()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/frontend/parser.rs:150:16
[INFO] [stdout]     |
[INFO] [stdout] 150 |             if !root_expression.is_err() && !right.is_err() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `root_expression.is_ok()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/frontend/parser.rs:150:45
[INFO] [stdout]     |
[INFO] [stdout] 150 |             if !root_expression.is_err() && !right.is_err() {
[INFO] [stdout]     |                                             ^^^^^^^^^^^^^^^ help: try: `right.is_ok()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/lib.rs:30:38
[INFO] [stdout]    |
[INFO] [stdout] 30 |         Err(lex_error) => return Err(String::from(lex_error)),
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `lex_error`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout]    = note: `#[warn(clippy::useless_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/lib.rs:34:46
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Some(Err(parse_error)) => return Err(String::from(parse_error)),
[INFO] [stdout]    |                                              ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `parse_error`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/lib.rs:40:35
[INFO] [stdout]    |
[INFO] [stdout] 40 |         Err(runtime_error) => Err(String::from(runtime_error))
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `runtime_error`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.57s
[INFO] running `Command { std: "docker" "inspect" "1f29e0812c885ef151eb39382c8da77f2bf584a808133d41f1dcc215fbe385b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f29e0812c885ef151eb39382c8da77f2bf584a808133d41f1dcc215fbe385b9", kill_on_drop: false }`
[INFO] [stdout] 1f29e0812c885ef151eb39382c8da77f2bf584a808133d41f1dcc215fbe385b9