[INFO] cloning repository stwen77/interpreter
[INFO] running `"git" "clone" "--bare" "git://github.com/stwen77/interpreter.git" "work/cache/sources/gh/stwen77/interpreter"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/stwen77/interpreter'...
[INFO] running `"git" "clone" "work/cache/sources/gh/stwen77/interpreter" "work/ex/beta-1.37-6/sources/1.36.0/gh/stwen77/interpreter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/stwen77/interpreter'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/stwen77/interpreter" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/stwen77/interpreter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/stwen77/interpreter'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6f29cecd76e3d05ffac6be9e9ef6e26b78af63cc
[INFO] sha for GitHub repo stwen77/interpreter: 6f29cecd76e3d05ffac6be9e9ef6e26b78af63cc
[INFO] validating manifest of stwen77/interpreter on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of stwen77/interpreter on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing stwen77/interpreter
[INFO] finished frobbing stwen77/interpreter
[INFO] frobbed toml for stwen77/interpreter written to work/ex/beta-1.37-6/sources/1.36.0/gh/stwen77/interpreter/Cargo.toml
[INFO] started frobbing stwen77/interpreter
[INFO] finished frobbing stwen77/interpreter
[INFO] frobbed toml for stwen77/interpreter written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/stwen77/interpreter/Cargo.toml
[INFO] crate stwen77/interpreter already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing stwen77/interpreter against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/stwen77/interpreter:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 8d0bb42d202a2cb8e08d92a795c519b4120c845fdc607d5bc45209fd325bedff
[INFO] running `"docker" "start" "-a" "8d0bb42d202a2cb8e08d92a795c519b4120c845fdc607d5bc45209fd325bedff"`
[INFO] [stderr]    Compiling interpreter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Deref`
[INFO] [stderr]  --> src/module/engine.rs:5:44
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::ops::{Add, BitAnd, BitOr, BitXor, Deref, Div, Mul, Neg, Rem, Shl, Shr, Sub};
[INFO] [stderr]   |                                            ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 561 |         reg_op!(engine, "+", add, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 561 |         reg_op!(engine, "+", add, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 562 |         reg_op!(engine, "-", sub, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 563 |         reg_op!(engine, "*", mul, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 564 |         reg_op!(engine, "/", div, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 566 |         reg_cmp!(engine, "<", lt, i32, i64, u32, u64, String, f64);
[INFO] [stderr]     |         ----------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 567 |         reg_cmp!(engine, "<=", lte, i32, i64, u32, u64, String, f64);
[INFO] [stderr]     |         ------------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 568 |         reg_cmp!(engine, ">", gt, i32, i64, u32, u64, String, f64);
[INFO] [stderr]     |         ----------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 569 |         reg_cmp!(engine, ">=", gte, i32, i64, u32, u64, String, f64);
[INFO] [stderr]     |         ------------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 570 |         reg_cmp!(engine, "==", eq, i32, i64, u32, u64, bool, String, f64);
[INFO] [stderr]     |         ------------------------------------------------------------------ in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 571 |         reg_cmp!(engine, "!=", ne, i32, i64, u32, u64, bool, String, f64);
[INFO] [stderr]     |         ------------------------------------------------------------------ in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 573 |         reg_op!(engine, "||", or, bool);
[INFO] [stderr]     |         -------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 574 |         reg_op!(engine, "&&", and, bool);
[INFO] [stderr]     |         --------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 575 |         reg_op!(engine, "|", binary_or, i32, i64, u32, u64);
[INFO] [stderr]     |         ---------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 576 |         reg_op!(engine, "|", or, bool);
[INFO] [stderr]     |         ------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 577 |         reg_op!(engine, "&", binary_and, i32, i64, u32, u64);
[INFO] [stderr]     |         ----------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 578 |         reg_op!(engine, "&", and, bool);
[INFO] [stderr]     |         -------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 579 |         reg_op!(engine, "^", binary_xor, i32, i64, u32, u64);
[INFO] [stderr]     |         ----------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 580 |         reg_op!(engine, "<<", left_shift, i32, i64, u32, u64);
[INFO] [stderr]     |         ------------------------------------------------------ in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 581 |         reg_op!(engine, ">>", right_shift, i32, i64, u32, u64);
[INFO] [stderr]     |         ------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 582 |         reg_op!(engine, "%", modulo, i32, i64, u32, u64);
[INFO] [stderr]     |         ------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:473:45
[INFO] [stderr]     |
[INFO] [stderr] 473 |                     $engine.register_fn($x, ($op as fn(x: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 587 |         reg_un!(engine, "-", neg, i32, i64, f32, f64);
[INFO] [stderr]     |         ---------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:473:45
[INFO] [stderr]     |
[INFO] [stderr] 473 |                     $engine.register_fn($x, ($op as fn(x: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 588 |         reg_un!(engine, "!", not, bool);
[INFO] [stderr]     |         -------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/module/engine.rs:378:33
[INFO] [stderr]     |
[INFO] [stderr] 378 |                                 Err(x) => return Err(x),
[INFO] [stderr]     |                                 ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unreachable_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/module/engine.rs:391:21
[INFO] [stderr]     |
[INFO] [stderr] 391 |                     Err(x) => return Err(x),
[INFO] [stderr]     |                     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/module/engine.rs:411:13
[INFO] [stderr]     |
[INFO] [stderr] 411 |             _ => Err(()),
[INFO] [stderr]     |             ^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/main.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn test_fn(a: i32, b: i32, c: i32) {
[INFO] [stderr]    |            ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/main.rs:18:20
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn test_fn(a: i32, b: i32, c: i32) {
[INFO] [stderr]    |                    ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/main.rs:18:28
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn test_fn(a: i32, b: i32, c: i32) {
[INFO] [stderr]    |                            ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/module/engine.rs:557:20
[INFO] [stderr]     |
[INFO] [stderr] 557 |         fn unit_eq(a: (), b: ()) -> bool {
[INFO] [stderr]     |                    ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/module/engine.rs:557:27
[INFO] [stderr]     |
[INFO] [stderr] 557 |         fn unit_eq(a: (), b: ()) -> bool {
[INFO] [stderr]     |                           ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/module/engine.rs:53:35
[INFO] [stderr]    |
[INFO] [stderr] 53 |                 FnIntExt::Int(ref f) => Err(()),
[INFO] [stderr]    |                                   ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `args`
[INFO] [stderr]    --> src/module/engine.rs:315:43
[INFO] [stderr]     |
[INFO] [stderr] 315 |             Expr::FnCall(ref fn_name, ref args) => {
[INFO] [stderr]     |                                           ^^^^ help: consider prefixing with an underscore: `_args`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]    --> src/module/engine.rs:436:25
[INFO] [stderr]     |
[INFO] [stderr] 436 |                 let mut x: Result<Box<Any>, ()> = Ok(Box::new(()));
[INFO] [stderr]     |                         ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]    --> src/module/engine.rs:452:29
[INFO] [stderr]     |
[INFO] [stderr] 452 |                         Err(e) => Err(()),
[INFO] [stderr]     |                             ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `drain`
[INFO] [stderr]    --> src/module/engine.rs:676:21
[INFO] [stderr]     |
[INFO] [stderr] 676 |             let mut drain = args.drain(..);
[INFO] [stderr]     |                     ^^^^^ help: consider prefixing with an underscore: `_drain`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/module/parser.rs:207:20
[INFO] [stderr]     |
[INFO] [stderr] 207 |     while let Some(a) = token_iterator.char_stream.peek() {
[INFO] [stderr]     |                    ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `radix_base`
[INFO] [stderr]    --> src/module/parser.rs:738:29
[INFO] [stderr]     |
[INFO] [stderr] 738 |                     let mut radix_base: Option<u32> = None;
[INFO] [stderr]     |                             ^^^^^^^^^^ help: consider prefixing with an underscore: `_radix_base`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]    --> src/module/parser.rs:803:25
[INFO] [stderr]     |
[INFO] [stderr] 803 |                     Err(e) => return Some(Token::LexErr),
[INFO] [stderr]     |                         ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/module/engine.rs:676:17
[INFO] [stderr]     |
[INFO] [stderr] 676 |             let mut drain = args.drain(..);
[INFO] [stderr]     |                 ----^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/module/parser.rs:738:25
[INFO] [stderr]     |
[INFO] [stderr] 738 |                     let mut radix_base: Option<u32> = None;
[INFO] [stderr]     |                         ----^^^^^^^^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `box_clone`
[INFO] [stderr]   --> src/module/any.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn box_clone(&self) -> Box<Any> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `TempStub`
[INFO] [stderr]   --> src/module/parser.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     TempStub,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `CharConst`
[INFO] [stderr]   --> src/module/parser.rs:48:5
[INFO] [stderr]    |
[INFO] [stderr] 48 |     CharConst(char),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Divide`
[INFO] [stderr]   --> src/module/parser.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 |     Divide,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `DivideAssign`
[INFO] [stderr]   --> src/module/parser.rs:91:5
[INFO] [stderr]    |
[INFO] [stderr] 91 |     DivideAssign,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     engine_vm.call_fn("test".to_string(), vec![&mut a, &mut b, &mut c]);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         engine_vm.eval_file::<()>(&fname);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/module/engine.rs:48:9
[INFO] [stderr]    |
[INFO] [stderr] 48 | /         self.functions
[INFO] [stderr] 49 | |             .get(&spec)
[INFO] [stderr] 50 | |             .ok_or(())
[INFO] [stderr] 51 | |             .and_then(move |f| match **f {
[INFO] [stderr] 52 | |                 FnIntExt::Ext(ref f) => f(args),
[INFO] [stderr] 53 | |                 FnIntExt::Int(ref f) => Err(()),
[INFO] [stderr] 54 | |             });
[INFO] [stderr]    | |_______________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/module/engine.rs:421:17
[INFO] [stderr]     |
[INFO] [stderr] 421 |                 self.eval::<T>(&mut contents);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable `P` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:610:17
[INFO] [stderr]     |
[INFO] [stderr] 610 |             let P = ((*drain.next().unwrap()).downcast_mut() as Option<&mut P>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `p`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Q` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:611:17
[INFO] [stderr]     |
[INFO] [stderr] 611 |             let Q = ((*drain.next().unwrap()).downcast_mut() as Option<&mut Q>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `q`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `R` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:612:17
[INFO] [stderr]     |
[INFO] [stderr] 612 |             let R = ((*drain.next().unwrap()).downcast_mut() as Option<&mut R>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `r`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `P` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:637:17
[INFO] [stderr]     |
[INFO] [stderr] 637 |             let P = ((*drain.next().unwrap()).downcast_mut() as Option<&mut P>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `p`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Q` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:638:17
[INFO] [stderr]     |
[INFO] [stderr] 638 |             let Q = ((*drain.next().unwrap()).downcast_mut() as Option<&mut Q>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `q`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `P` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:658:17
[INFO] [stderr]     |
[INFO] [stderr] 658 |             let P = ((*drain.next().unwrap()).downcast_mut() as Option<&mut P>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `p`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.02s
[INFO] running `"docker" "inspect" "8d0bb42d202a2cb8e08d92a795c519b4120c845fdc607d5bc45209fd325bedff"`
[INFO] running `"docker" "rm" "-f" "8d0bb42d202a2cb8e08d92a795c519b4120c845fdc607d5bc45209fd325bedff"`
[INFO] [stdout] 8d0bb42d202a2cb8e08d92a795c519b4120c845fdc607d5bc45209fd325bedff
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/stwen77/interpreter:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 7ba1480ee700b69c3b6347f3b17bad68c58f7605df22054ebf86616b4938b2dd
[INFO] running `"docker" "start" "-a" "7ba1480ee700b69c3b6347f3b17bad68c58f7605df22054ebf86616b4938b2dd"`
[INFO] [stderr]    Compiling interpreter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Deref`
[INFO] [stderr]  --> src/module/engine.rs:5:44
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::ops::{Add, BitAnd, BitOr, BitXor, Deref, Div, Mul, Neg, Rem, Shl, Shr, Sub};
[INFO] [stderr]   |                                            ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 561 |         reg_op!(engine, "+", add, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 561 |         reg_op!(engine, "+", add, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 562 |         reg_op!(engine, "-", sub, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 563 |         reg_op!(engine, "*", mul, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 564 |         reg_op!(engine, "/", div, i32, i64, u32, u64, f32, f64);
[INFO] [stderr]     |         -------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 566 |         reg_cmp!(engine, "<", lt, i32, i64, u32, u64, String, f64);
[INFO] [stderr]     |         ----------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 567 |         reg_cmp!(engine, "<=", lte, i32, i64, u32, u64, String, f64);
[INFO] [stderr]     |         ------------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 568 |         reg_cmp!(engine, ">", gt, i32, i64, u32, u64, String, f64);
[INFO] [stderr]     |         ----------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 569 |         reg_cmp!(engine, ">=", gte, i32, i64, u32, u64, String, f64);
[INFO] [stderr]     |         ------------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 570 |         reg_cmp!(engine, "==", eq, i32, i64, u32, u64, bool, String, f64);
[INFO] [stderr]     |         ------------------------------------------------------------------ in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:481:45
[INFO] [stderr]     |
[INFO] [stderr] 481 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->bool));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 571 |         reg_cmp!(engine, "!=", ne, i32, i64, u32, u64, bool, String, f64);
[INFO] [stderr]     |         ------------------------------------------------------------------ in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 573 |         reg_op!(engine, "||", or, bool);
[INFO] [stderr]     |         -------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 574 |         reg_op!(engine, "&&", and, bool);
[INFO] [stderr]     |         --------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 575 |         reg_op!(engine, "|", binary_or, i32, i64, u32, u64);
[INFO] [stderr]     |         ---------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 576 |         reg_op!(engine, "|", or, bool);
[INFO] [stderr]     |         ------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 577 |         reg_op!(engine, "&", binary_and, i32, i64, u32, u64);
[INFO] [stderr]     |         ----------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 578 |         reg_op!(engine, "&", and, bool);
[INFO] [stderr]     |         -------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 579 |         reg_op!(engine, "^", binary_xor, i32, i64, u32, u64);
[INFO] [stderr]     |         ----------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 580 |         reg_op!(engine, "<<", left_shift, i32, i64, u32, u64);
[INFO] [stderr]     |         ------------------------------------------------------ in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 581 |         reg_op!(engine, ">>", right_shift, i32, i64, u32, u64);
[INFO] [stderr]     |         ------------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:466:45
[INFO] [stderr]     |
[INFO] [stderr] 466 |                     $engine.register_fn($x, ($op as fn(x: $y, y: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 582 |         reg_op!(engine, "%", modulo, i32, i64, u32, u64);
[INFO] [stderr]     |         ------------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:473:45
[INFO] [stderr]     |
[INFO] [stderr] 473 |                     $engine.register_fn($x, ($op as fn(x: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 587 |         reg_un!(engine, "-", neg, i32, i64, f32, f64);
[INFO] [stderr]     |         ---------------------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/module/engine.rs:473:45
[INFO] [stderr]     |
[INFO] [stderr] 473 |                     $engine.register_fn($x, ($op as fn(x: $y)->$y));
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] ...
[INFO] [stderr] 588 |         reg_un!(engine, "!", not, bool);
[INFO] [stderr]     |         -------------------------------- in this macro invocation
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/module/engine.rs:378:33
[INFO] [stderr]     |
[INFO] [stderr] 378 |                                 Err(x) => return Err(x),
[INFO] [stderr]     |                                 ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unreachable_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/module/engine.rs:391:21
[INFO] [stderr]     |
[INFO] [stderr] 391 |                     Err(x) => return Err(x),
[INFO] [stderr]     |                     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/module/engine.rs:411:13
[INFO] [stderr]     |
[INFO] [stderr] 411 |             _ => Err(()),
[INFO] [stderr]     |             ^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/main.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn test_fn(a: i32, b: i32, c: i32) {
[INFO] [stderr]    |            ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/main.rs:18:20
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn test_fn(a: i32, b: i32, c: i32) {
[INFO] [stderr]    |                    ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/main.rs:18:28
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn test_fn(a: i32, b: i32, c: i32) {
[INFO] [stderr]    |                            ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/module/engine.rs:557:20
[INFO] [stderr]     |
[INFO] [stderr] 557 |         fn unit_eq(a: (), b: ()) -> bool {
[INFO] [stderr]     |                    ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/module/engine.rs:557:27
[INFO] [stderr]     |
[INFO] [stderr] 557 |         fn unit_eq(a: (), b: ()) -> bool {
[INFO] [stderr]     |                           ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/module/engine.rs:53:35
[INFO] [stderr]    |
[INFO] [stderr] 53 |                 FnIntExt::Int(ref f) => Err(()),
[INFO] [stderr]    |                                   ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `args`
[INFO] [stderr]    --> src/module/engine.rs:315:43
[INFO] [stderr]     |
[INFO] [stderr] 315 |             Expr::FnCall(ref fn_name, ref args) => {
[INFO] [stderr]     |                                           ^^^^ help: consider prefixing with an underscore: `_args`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]    --> src/module/engine.rs:436:25
[INFO] [stderr]     |
[INFO] [stderr] 436 |                 let mut x: Result<Box<Any>, ()> = Ok(Box::new(()));
[INFO] [stderr]     |                         ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]    --> src/module/engine.rs:452:29
[INFO] [stderr]     |
[INFO] [stderr] 452 |                         Err(e) => Err(()),
[INFO] [stderr]     |                             ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `drain`
[INFO] [stderr]    --> src/module/engine.rs:676:21
[INFO] [stderr]     |
[INFO] [stderr] 676 |             let mut drain = args.drain(..);
[INFO] [stderr]     |                     ^^^^^ help: consider prefixing with an underscore: `_drain`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/module/parser.rs:207:20
[INFO] [stderr]     |
[INFO] [stderr] 207 |     while let Some(a) = token_iterator.char_stream.peek() {
[INFO] [stderr]     |                    ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `radix_base`
[INFO] [stderr]    --> src/module/parser.rs:738:29
[INFO] [stderr]     |
[INFO] [stderr] 738 |                     let mut radix_base: Option<u32> = None;
[INFO] [stderr]     |                             ^^^^^^^^^^ help: consider prefixing with an underscore: `_radix_base`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]    --> src/module/parser.rs:803:25
[INFO] [stderr]     |
[INFO] [stderr] 803 |                     Err(e) => return Some(Token::LexErr),
[INFO] [stderr]     |                         ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/module/engine.rs:676:17
[INFO] [stderr]     |
[INFO] [stderr] 676 |             let mut drain = args.drain(..);
[INFO] [stderr]     |                 ----^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/module/parser.rs:738:25
[INFO] [stderr]     |
[INFO] [stderr] 738 |                     let mut radix_base: Option<u32> = None;
[INFO] [stderr]     |                         ----^^^^^^^^^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `box_clone`
[INFO] [stderr]   --> src/module/any.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn box_clone(&self) -> Box<Any> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `TempStub`
[INFO] [stderr]   --> src/module/parser.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     TempStub,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `CharConst`
[INFO] [stderr]   --> src/module/parser.rs:48:5
[INFO] [stderr]    |
[INFO] [stderr] 48 |     CharConst(char),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Divide`
[INFO] [stderr]   --> src/module/parser.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 |     Divide,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `DivideAssign`
[INFO] [stderr]   --> src/module/parser.rs:91:5
[INFO] [stderr]    |
[INFO] [stderr] 91 |     DivideAssign,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     engine_vm.call_fn("test".to_string(), vec![&mut a, &mut b, &mut c]);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         engine_vm.eval_file::<()>(&fname);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/module/engine.rs:48:9
[INFO] [stderr]    |
[INFO] [stderr] 48 | /         self.functions
[INFO] [stderr] 49 | |             .get(&spec)
[INFO] [stderr] 50 | |             .ok_or(())
[INFO] [stderr] 51 | |             .and_then(move |f| match **f {
[INFO] [stderr] 52 | |                 FnIntExt::Ext(ref f) => f(args),
[INFO] [stderr] 53 | |                 FnIntExt::Int(ref f) => Err(()),
[INFO] [stderr] 54 | |             });
[INFO] [stderr]    | |_______________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/module/engine.rs:421:17
[INFO] [stderr]     |
[INFO] [stderr] 421 |                 self.eval::<T>(&mut contents);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable `P` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:610:17
[INFO] [stderr]     |
[INFO] [stderr] 610 |             let P = ((*drain.next().unwrap()).downcast_mut() as Option<&mut P>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `p`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Q` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:611:17
[INFO] [stderr]     |
[INFO] [stderr] 611 |             let Q = ((*drain.next().unwrap()).downcast_mut() as Option<&mut Q>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `q`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `R` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:612:17
[INFO] [stderr]     |
[INFO] [stderr] 612 |             let R = ((*drain.next().unwrap()).downcast_mut() as Option<&mut R>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `r`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `P` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:637:17
[INFO] [stderr]     |
[INFO] [stderr] 637 |             let P = ((*drain.next().unwrap()).downcast_mut() as Option<&mut P>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `p`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Q` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:638:17
[INFO] [stderr]     |
[INFO] [stderr] 638 |             let Q = ((*drain.next().unwrap()).downcast_mut() as Option<&mut Q>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `q`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `P` should have a snake case name
[INFO] [stderr]    --> src/module/engine.rs:658:17
[INFO] [stderr]     |
[INFO] [stderr] 658 |             let P = ((*drain.next().unwrap()).downcast_mut() as Option<&mut P>).ok_or(())?;
[INFO] [stderr]     |                 ^ help: convert the identifier to snake case: `p`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `"docker" "inspect" "7ba1480ee700b69c3b6347f3b17bad68c58f7605df22054ebf86616b4938b2dd"`
[INFO] running `"docker" "rm" "-f" "7ba1480ee700b69c3b6347f3b17bad68c58f7605df22054ebf86616b4938b2dd"`
[INFO] [stdout] 7ba1480ee700b69c3b6347f3b17bad68c58f7605df22054ebf86616b4938b2dd
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/stwen77/interpreter:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 0c3d768355fc97481afcbb062e70a93c5d71efc6460caa9e3012311f9aab5a3c
[INFO] running `"docker" "start" "-a" "0c3d768355fc97481afcbb062e70a93c5d71efc6460caa9e3012311f9aab5a3c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/interpreter-d2ee552861c85874
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "0c3d768355fc97481afcbb062e70a93c5d71efc6460caa9e3012311f9aab5a3c"`
[INFO] running `"docker" "rm" "-f" "0c3d768355fc97481afcbb062e70a93c5d71efc6460caa9e3012311f9aab5a3c"`
[INFO] [stdout] 0c3d768355fc97481afcbb062e70a93c5d71efc6460caa9e3012311f9aab5a3c