[INFO] fetching crate mosaic-lang 0.0.2-beta.3...
[INFO] checking mosaic-lang-0.0.2-beta.3 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate mosaic-lang 0.0.2-beta.3 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate mosaic-lang 0.0.2-beta.3
[INFO] finished tweaking crates.io crate mosaic-lang 0.0.2-beta.3
[INFO] tweaked toml for crates.io crate mosaic-lang 0.0.2-beta.3 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mosaic-lang 0.0.2-beta.3 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mosaic-lang 0.0.2-beta.3 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 88a3cdc2aa73fd26d1cbd764e0cfd6c51568d7935f6733eb5ca506e928fe4c3f
[INFO] running `Command { std: "docker" "start" "-a" "88a3cdc2aa73fd26d1cbd764e0cfd6c51568d7935f6733eb5ca506e928fe4c3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88a3cdc2aa73fd26d1cbd764e0cfd6c51568d7935f6733eb5ca506e928fe4c3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88a3cdc2aa73fd26d1cbd764e0cfd6c51568d7935f6733eb5ca506e928fe4c3f", kill_on_drop: false }`
[INFO] [stdout] 88a3cdc2aa73fd26d1cbd764e0cfd6c51568d7935f6733eb5ca506e928fe4c3f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c489ed0d1406ab3f29f5db27c974b5da416e3d31813b6f8e6268e64b2b7ea167
[INFO] running `Command { std: "docker" "start" "-a" "c489ed0d1406ab3f29f5db27c974b5da416e3d31813b6f8e6268e64b2b7ea167", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `cranelift_native`
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | use cranelift_native;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ExitCode` and `Termination`
[INFO] [stdout]   --> src/main.rs:21:26
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::process::{exit, ExitCode, Termination};
[INFO] [stdout]    |                          ^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `IsaBuilder`
[INFO] [stdout]   --> src/main.rs:23:38
[INFO] [stdout]    |
[INFO] [stdout] 23 | use cranelift_codegen::isa::{lookup, IsaBuilder};
[INFO] [stdout]    |                                      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FuncRef`
[INFO] [stdout]  --> src/compiler/cranelift/builders.rs:6:29
[INFO] [stdout]   |
[INFO] [stdout] 6 | use cranelift_codegen::ir::{FuncRef, InstBuilder, MemFlags, StackSlotData, StackSlotKind, Value};
[INFO] [stdout]   |                             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `env`
[INFO] [stdout]  --> src/compiler/cranelift/linker.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{env, process};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cranelift_object::object::Architecture`
[INFO] [stdout]  --> src/compiler/cranelift/linker.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use cranelift_object::object::Architecture;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/compiler/cranelift/module.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/compiler/cranelift/module.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]   --> src/compiler/cranelift/types.rs:13:33
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]    |                                 ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Any` and `TypeId`
[INFO] [stdout]   --> src/compiler/cranelift/types.rs:17:16
[INFO] [stdout]    |
[INFO] [stdout] 17 | use std::any::{Any, TypeId};
[INFO] [stdout]    |                ^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cranelift_native`
[INFO] [stdout]   --> src/compiler/cranelift/mod.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | use cranelift_native;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]   --> src/compiler/cranelift/mod.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | use std::any::Any;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]   --> src/compiler/cranelift/mod.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 | use std::fmt::Display;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `DowncastSync`
[INFO] [stdout]  --> src/compiler/traits.rs:8:44
[INFO] [stdout]   |
[INFO] [stdout] 8 | use downcast_rs::{impl_downcast, Downcast, DowncastSync};
[INFO] [stdout]   |                                            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `write`
[INFO] [stdout]  --> src/parser.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::fmt::{write, Debug, Display, Formatter};
[INFO] [stdout]   |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `NonZeroUsize` and `NonZero`
[INFO] [stdout]  --> src/tokens.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::num::{NonZero, NonZeroUsize};
[INFO] [stdout]   |                ^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::slice::SliceIndex`
[INFO] [stdout]  --> src/tokens.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::slice::SliceIndex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Debug` and `Display`
[INFO] [stdout]  --> src/utils.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display};
[INFO] [stdout]   |                ^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/utils.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cranelift_native`
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | use cranelift_native;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ExitCode` and `Termination`
[INFO] [stdout]   --> src/main.rs:21:26
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::process::{exit, ExitCode, Termination};
[INFO] [stdout]    |                          ^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `IsaBuilder`
[INFO] [stdout]   --> src/main.rs:23:38
[INFO] [stdout]    |
[INFO] [stdout] 23 | use cranelift_codegen::isa::{lookup, IsaBuilder};
[INFO] [stdout]    |                                      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FuncRef`
[INFO] [stdout]  --> src/compiler/cranelift/builders.rs:6:29
[INFO] [stdout]   |
[INFO] [stdout] 6 | use cranelift_codegen::ir::{FuncRef, InstBuilder, MemFlags, StackSlotData, StackSlotKind, Value};
[INFO] [stdout]   |                             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `env`
[INFO] [stdout]  --> src/compiler/cranelift/linker.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{env, process};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cranelift_object::object::Architecture`
[INFO] [stdout]  --> src/compiler/cranelift/linker.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use cranelift_object::object::Architecture;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::compiler::cranelift::mangle::mangle_method`
[INFO] [stdout]   --> src/compiler/cranelift/mangle.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |     use crate::compiler::cranelift::mangle::mangle_method;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::compiler::cranelift::types::CraneliftType`
[INFO] [stdout]   --> src/compiler/cranelift/mangle.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     use crate::compiler::cranelift::types::CraneliftType;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/compiler/cranelift/module.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/compiler/cranelift/module.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]   --> src/compiler/cranelift/types.rs:13:33
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]    |                                 ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Any` and `TypeId`
[INFO] [stdout]   --> src/compiler/cranelift/types.rs:17:16
[INFO] [stdout]    |
[INFO] [stdout] 17 | use std::any::{Any, TypeId};
[INFO] [stdout]    |                ^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cranelift_native`
[INFO] [stdout]   --> src/compiler/cranelift/mod.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | use cranelift_native;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]   --> src/compiler/cranelift/mod.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | use std::any::Any;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]   --> src/compiler/cranelift/mod.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 | use std::fmt::Display;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `DowncastSync`
[INFO] [stdout]  --> src/compiler/traits.rs:8:44
[INFO] [stdout]   |
[INFO] [stdout] 8 | use downcast_rs::{impl_downcast, Downcast, DowncastSync};
[INFO] [stdout]   |                                            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `write`
[INFO] [stdout]  --> src/parser.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::fmt::{write, Debug, Display, Formatter};
[INFO] [stdout]   |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `NonZeroUsize` and `NonZero`
[INFO] [stdout]  --> src/tokens.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::num::{NonZero, NonZeroUsize};
[INFO] [stdout]   |                ^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::slice::SliceIndex`
[INFO] [stdout]  --> src/tokens.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::slice::SliceIndex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Debug` and `Display`
[INFO] [stdout]  --> src/utils.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display};
[INFO] [stdout]   |                ^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/utils.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/compiler/cranelift/linker.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |             ref file,
[INFO] [stdout]    |             ^^^^^^^^ help: try ignoring the field: `file: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target`
[INFO] [stdout]   --> src/compiler/cranelift/linker.rs:36:13
[INFO] [stdout]    |
[INFO] [stdout] 36 |             ref target,
[INFO] [stdout]    |             ^^^^^^^^^^ help: try ignoring the field: `target: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/compiler/cranelift/linker.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |             ref file,
[INFO] [stdout]    |             ^^^^^^^^ help: try ignoring the field: `file: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target`
[INFO] [stdout]   --> src/compiler/cranelift/linker.rs:36:13
[INFO] [stdout]    |
[INFO] [stdout] 36 |             ref target,
[INFO] [stdout]    |             ^^^^^^^^^^ help: try ignoring the field: `target: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ty`
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:228:40
[INFO] [stdout]     |
[INFO] [stdout] 228 | ...                   let (addr, ty) = self.compile_body_expr(val, func, trace)?;
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_ty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ty`
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:228:40
[INFO] [stdout]     |
[INFO] [stdout] 228 | ...                   let (addr, ty) = self.compile_body_expr(val, func, trace)?;
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_ty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:913:26
[INFO] [stdout]     |
[INFO] [stdout] 913 |                     let (f, fty) = self
[INFO] [stdout]     |                          ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fpty`
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1628:13
[INFO] [stdout]      |
[INFO] [stdout] 1628 |         let fpty = Type::FuncPtr {
[INFO] [stdout]      |             ^^^^ help: if this is intentional, prefix it with an underscore: `_fpty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parent_path`
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1713:21
[INFO] [stdout]      |
[INFO] [stdout] 1713 |                 let parent_path = self
[INFO] [stdout]      |                     ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent_path`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:261:51
[INFO] [stdout]     |
[INFO] [stdout] 261 |             CompilationError::UnknownModule(file, trace, modules) => {
[INFO] [stdout]     |                                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:312:55
[INFO] [stdout]     |
[INFO] [stdout] 312 |             CompilationError::UndefinedVariable(file, trace, name) => {
[INFO] [stdout]     |                                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:336:52
[INFO] [stdout]     |
[INFO] [stdout] 336 |             CompilationError::DualDefinition(file, trace, name) => {
[INFO] [stdout]     |                                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:359:55
[INFO] [stdout]     |
[INFO] [stdout] 359 |             CompilationError::UndefinedOperator(file, trace, op) => {
[INFO] [stdout]     |                                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:375:50
[INFO] [stdout]     |
[INFO] [stdout] 375 |             CompilationError::CannotMutate(file, trace, name) => {
[INFO] [stdout]     |                                                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:391:57
[INFO] [stdout]     |
[INFO] [stdout] 391 |             CompilationError::MismatchedTypeInDef(file, trace, name, expected, got) => {
[INFO] [stdout]     |                                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:437:49
[INFO] [stdout]     |
[INFO] [stdout] 437 |             CompilationError::InvalidCast(file, trace, from, to) => {
[INFO] [stdout]     |                                                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:456:55
[INFO] [stdout]     |
[INFO] [stdout] 456 |             CompilationError::CannotMakePointer(file, trace, to) => {
[INFO] [stdout]     |                                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:484:46
[INFO] [stdout]     |
[INFO] [stdout] 484 |             CompilationError::NotFreed(file, trace, item) => {
[INFO] [stdout]     |                                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:509:54
[INFO] [stdout]     |
[INFO] [stdout] 509 |             CompilationError::InvalidSignature(file, trace, name, ret, args) => {
[INFO] [stdout]     |                                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/parser.rs:749:30
[INFO] [stdout]     |
[INFO] [stdout] 749 |                     Some(Err(e)) => match self.parse_type() {
[INFO] [stdout]     |                              ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/parser.rs:769:26
[INFO] [stdout]     |
[INFO] [stdout] 769 |                 Some(Err(e)) => match self.parse_type() {
[INFO] [stdout]     |                          ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:913:26
[INFO] [stdout]     |
[INFO] [stdout] 913 |                     let (f, fty) = self
[INFO] [stdout]     |                          ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `builder_ctx` is never read
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout]  97 | pub struct CraneliftGenerator {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 103 |     builder_ctx: RefCell<FunctionBuilderContext>,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_calls_of_func` is never used
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1526:8
[INFO] [stdout]      |
[INFO] [stdout]  124 | impl CraneliftGenerator {
[INFO] [stdout]      | ----------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 1526 |     fn get_calls_of_func(
[INFO] [stdout]      |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/utils.rs:29:19
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl<T> UseSparingly<T> {
[INFO] [stdout]    | ----------------------- associated function in this implementation
[INFO] [stdout] 29 |     pub(crate) fn new(t: T) -> UseSparingly<T> {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fpty`
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1628:13
[INFO] [stdout]      |
[INFO] [stdout] 1628 |         let fpty = Type::FuncPtr {
[INFO] [stdout]      |             ^^^^ help: if this is intentional, prefix it with an underscore: `_fpty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `parent_path`
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1713:21
[INFO] [stdout]      |
[INFO] [stdout] 1713 |                 let parent_path = self
[INFO] [stdout]      |                     ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent_path`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> src/compiler/cranelift/linker.rs:130:32
[INFO] [stdout]     |
[INFO] [stdout] 130 |                     return Err(String::from_utf8_lossy(&r.stderr).parse().unwrap())
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mosaic-lang` (bin "msc" test) due to 1 previous error; 40 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:261:51
[INFO] [stdout]     |
[INFO] [stdout] 261 |             CompilationError::UnknownModule(file, trace, modules) => {
[INFO] [stdout]     |                                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:312:55
[INFO] [stdout]     |
[INFO] [stdout] 312 |             CompilationError::UndefinedVariable(file, trace, name) => {
[INFO] [stdout]     |                                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:336:52
[INFO] [stdout]     |
[INFO] [stdout] 336 |             CompilationError::DualDefinition(file, trace, name) => {
[INFO] [stdout]     |                                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:359:55
[INFO] [stdout]     |
[INFO] [stdout] 359 |             CompilationError::UndefinedOperator(file, trace, op) => {
[INFO] [stdout]     |                                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:375:50
[INFO] [stdout]     |
[INFO] [stdout] 375 |             CompilationError::CannotMutate(file, trace, name) => {
[INFO] [stdout]     |                                                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:391:57
[INFO] [stdout]     |
[INFO] [stdout] 391 |             CompilationError::MismatchedTypeInDef(file, trace, name, expected, got) => {
[INFO] [stdout]     |                                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:437:49
[INFO] [stdout]     |
[INFO] [stdout] 437 |             CompilationError::InvalidCast(file, trace, from, to) => {
[INFO] [stdout]     |                                                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:456:55
[INFO] [stdout]     |
[INFO] [stdout] 456 |             CompilationError::CannotMakePointer(file, trace, to) => {
[INFO] [stdout]     |                                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:484:46
[INFO] [stdout]     |
[INFO] [stdout] 484 |             CompilationError::NotFreed(file, trace, item) => {
[INFO] [stdout]     |                                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `trace`
[INFO] [stdout]    --> src/errors.rs:509:54
[INFO] [stdout]     |
[INFO] [stdout] 509 |             CompilationError::InvalidSignature(file, trace, name, ret, args) => {
[INFO] [stdout]     |                                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_trace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/parser.rs:749:30
[INFO] [stdout]     |
[INFO] [stdout] 749 |                     Some(Err(e)) => match self.parse_type() {
[INFO] [stdout]     |                              ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/parser.rs:769:26
[INFO] [stdout]     |
[INFO] [stdout] 769 |                 Some(Err(e)) => match self.parse_type() {
[INFO] [stdout]     |                          ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `builder_ctx` is never read
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout]  97 | pub struct CraneliftGenerator {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 103 |     builder_ctx: RefCell<FunctionBuilderContext>,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_calls_of_func` is never used
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1526:8
[INFO] [stdout]      |
[INFO] [stdout]  124 | impl CraneliftGenerator {
[INFO] [stdout]      | ----------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 1526 |     fn get_calls_of_func(
[INFO] [stdout]      |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/utils.rs:29:19
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl<T> UseSparingly<T> {
[INFO] [stdout]    | ----------------------- associated function in this implementation
[INFO] [stdout] 29 |     pub(crate) fn new(t: T) -> UseSparingly<T> {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]    --> src/compiler/cranelift/linker.rs:130:32
[INFO] [stdout]     |
[INFO] [stdout] 130 |                     return Err(String::from_utf8_lossy(&r.stderr).parse().unwrap())
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mosaic-lang` (bin "msc") due to 1 previous error; 42 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "c489ed0d1406ab3f29f5db27c974b5da416e3d31813b6f8e6268e64b2b7ea167", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c489ed0d1406ab3f29f5db27c974b5da416e3d31813b6f8e6268e64b2b7ea167", kill_on_drop: false }`
[INFO] [stdout] c489ed0d1406ab3f29f5db27c974b5da416e3d31813b6f8e6268e64b2b7ea167
