[INFO] cloning repository https://github.com/ljp-projects/mosaic
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ljp-projects/mosaic" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fljp-projects%2Fmosaic", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fljp-projects%2Fmosaic'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 91dd99221e6469c5e93851388044b97cd5325d6d
[INFO] checking ljp-projects/mosaic against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fljp-projects%2Fmosaic" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ljp-projects/mosaic
[INFO] finished tweaking git repo https://github.com/ljp-projects/mosaic
[INFO] tweaked toml for git repo https://github.com/ljp-projects/mosaic written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ljp-projects/mosaic 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 git repo https://github.com/ljp-projects/mosaic 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] 123c471a1d938894114dba6257f3f7f3e75f77a892b538ea876e39a6617b69f5
[INFO] running `Command { std: "docker" "start" "-a" "123c471a1d938894114dba6257f3f7f3e75f77a892b538ea876e39a6617b69f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "123c471a1d938894114dba6257f3f7f3e75f77a892b538ea876e39a6617b69f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "123c471a1d938894114dba6257f3f7f3e75f77a892b538ea876e39a6617b69f5", kill_on_drop: false }`
[INFO] [stdout] 123c471a1d938894114dba6257f3f7f3e75f77a892b538ea876e39a6617b69f5
[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] 128382324e6dd3eecc3edbb01413d6de273a9fad55fd2e05045feea32f7f0821
[INFO] running `Command { std: "docker" "start" "-a" "128382324e6dd3eecc3edbb01413d6de273a9fad55fd2e05045feea32f7f0821", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.94
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling cranelift-assembler-x64-meta v0.118.0
[INFO] [stderr]    Compiling pulley-interpreter v31.0.0
[INFO] [stderr]    Compiling cranelift-bitset v0.118.0
[INFO] [stderr]     Checking hashbrown v0.15.2
[INFO] [stderr]    Compiling log v0.4.26
[INFO] [stderr]    Compiling cranelift-isle v0.118.0
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.118.0
[INFO] [stderr]    Compiling libc v0.2.171
[INFO] [stderr]    Compiling target-lexicon v0.13.2
[INFO] [stderr]     Checking bumpalo v3.17.0
[INFO] [stderr]     Checking cobs v0.2.3
[INFO] [stderr]     Checking rustc-hash v2.1.1
[INFO] [stderr]     Checking arbitrary v1.4.1
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking indexmap v2.8.0
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.100
[INFO] [stderr]    Compiling cranelift-assembler-x64 v0.118.0
[INFO] [stderr]     Checking gimli v0.31.1
[INFO] [stderr]     Checking cranelift-control v0.118.0
[INFO] [stderr]    Compiling memoffset v0.7.1
[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]     Checking bitflags v2.9.0
[INFO] [stderr]    Compiling anyhow v1.0.97
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[INFO] [stderr]     Checking anstyle-parse v0.2.6
[INFO] [stderr]     Checking anstyle-query v1.1.2
[INFO] [stderr]    Compiling object v0.36.7
[INFO] [stderr]     Checking colorchoice v1.0.3
[INFO] [stderr]     Checking anstyle v1.0.10
[INFO] [stderr]     Checking anstream v0.6.18
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[INFO] [stderr]     Checking clap_builder v4.5.32
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]    Compiling cranelift-codegen-meta v0.118.0
[INFO] [stderr]     Checking homedir v0.3.4
[INFO] [stderr]     Checking downcast-rs v2.0.1
[INFO] [stderr]     Checking colored v3.0.0
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling enum-as-inner v0.6.1
[INFO] [stderr]    Compiling clap_derive v4.5.32
[INFO] [stderr]    Compiling tokio-macros v2.5.0
[INFO] [stderr]     Checking tokio v1.44.1
[INFO] [stderr]     Checking thiserror v1.0.69
[INFO] [stderr]     Checking sysctl v0.5.5
[INFO] [stderr]     Checking clap v4.5.32
[INFO] [stderr]    Compiling cranelift-codegen v0.118.0
[INFO] [stderr]     Checking mmap-rs v0.6.1
[INFO] [stderr]     Checking smallvec v1.14.0
[INFO] [stderr]     Checking postcard v1.1.1
[INFO] [stderr]     Checking cranelift-entity v0.118.0
[INFO] [stderr]     Checking regalloc2 v0.11.1
[INFO] [stderr]     Checking cranelift-bforest v0.118.0
[INFO] [stderr]     Checking cranelift-module v0.118.0
[INFO] [stderr]     Checking cranelift-interpreter v0.118.0
[INFO] [stderr]     Checking cranelift-frontend v0.118.0
[INFO] [stderr]     Checking cranelift-object v0.118.0
[INFO] [stderr]     Checking mosaic-lang v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `mangle_function` and `mangle_method`
[INFO] [stdout]   --> src/compiler/cranelift/mangle.rs:79:46
[INFO] [stdout]    |
[INFO] [stdout] 79 |     use crate::compiler::cranelift::mangle::{mangle_function, mangle_method, mangle_type};
[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 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: `AstNode`
[INFO] [stdout]  --> src/compiler/cranelift/types.rs:9:21
[INFO] [stdout]   |
[INFO] [stdout] 9 | use crate::parser::{AstNode, ParseType, TypeBound};
[INFO] [stdout]   |                     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Indirection`
[INFO] [stdout]  --> src/compiler/cranelift/value.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::utils::{Indirection, OneOf};
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::parser::AstNode`
[INFO] [stdout]  --> src/compiler/cranelift/indexing.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::parser::AstNode;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FuncRef`
[INFO] [stdout]   --> src/compiler/cranelift/mod.rs:35:73
[INFO] [stdout]    |
[INFO] [stdout] 35 | use cranelift_codegen::ir::{AbiParam, Block, ExtFuncData, ExternalName, FuncRef, Function, GlobalValue, InstBuilder, MemFlags, Signature,...
[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: `cranelift_codegen::gimli::Pointer::Indirect`
[INFO] [stdout]   --> src/parser.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use cranelift_codegen::gimli::Pointer::Indirect;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `mangle_function`, `mangle_method`, and `mangle_type`
[INFO] [stdout]   --> src/compiler/cranelift/mangle.rs:79:46
[INFO] [stdout]    |
[INFO] [stdout] 79 |     use crate::compiler::cranelift::mangle::{mangle_function, mangle_method, mangle_type};
[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 import: `crate::compiler::cranelift::types::CraneliftType`
[INFO] [stdout]   --> src/compiler/cranelift/mangle.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     use crate::compiler::cranelift::types::CraneliftType;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils::Indirection`
[INFO] [stdout]   --> src/compiler/cranelift/mangle.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     use crate::utils::Indirection;
[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: `AstNode`
[INFO] [stdout]  --> src/compiler/cranelift/types.rs:9:21
[INFO] [stdout]   |
[INFO] [stdout] 9 | use crate::parser::{AstNode, ParseType, TypeBound};
[INFO] [stdout]   |                     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Indirection`
[INFO] [stdout]  --> src/compiler/cranelift/value.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::utils::{Indirection, OneOf};
[INFO] [stdout]   |                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::parser::AstNode`
[INFO] [stdout]  --> src/compiler/cranelift/indexing.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::parser::AstNode;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FuncRef`
[INFO] [stdout]   --> src/compiler/cranelift/mod.rs:35:73
[INFO] [stdout]    |
[INFO] [stdout] 35 | use cranelift_codegen::ir::{AbiParam, Block, ExtFuncData, ExternalName, FuncRef, Function, GlobalValue, InstBuilder, MemFlags, Signature,...
[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: `cranelift_codegen::gimli::Pointer::Indirect`
[INFO] [stdout]   --> src/parser.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use cranelift_codegen::gimli::Pointer::Indirect;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/compiler/cranelift/linker.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 25 |             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:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |             ref target,
[INFO] [stdout]    |             ^^^^^^^^^^ help: try ignoring the field: `target: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:229:47
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     if let AstNode::IdxAccess(l, of, idx) = left {
[INFO] [stdout]     |                                               ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:228:41
[INFO] [stdout]     |
[INFO] [stdout] 228 |                 let AstNode::Identifier(l, name) = left else {
[INFO] [stdout]     |                                         ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1004:26
[INFO] [stdout]      |
[INFO] [stdout] 1004 |                     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: `parent_path`
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1799:21
[INFO] [stdout]      |
[INFO] [stdout] 1799 |                 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:806:30
[INFO] [stdout]     |
[INFO] [stdout] 806 |                     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:826:26
[INFO] [stdout]     |
[INFO] [stdout] 826 |                 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 `owner` is never read
[INFO] [stdout]  --> src/compiler/cranelift/value.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct OwnershipTrace {
[INFO] [stdout]   |            -------------- field in this struct
[INFO] [stdout] 7 |     /// Stores the name of the variable that owns the value, if any
[INFO] [stdout] 8 |     owner: OneOf<String, String, StatementIdentifier>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/utils.rs:27:19
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl<T> UseSparingly<T> {
[INFO] [stdout]    | ----------------------- associated function in this implementation
[INFO] [stdout] 27 |     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" test) due to 1 previous error; 29 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/compiler/cranelift/linker.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 25 |             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:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |             ref target,
[INFO] [stdout]    |             ^^^^^^^^^^ help: try ignoring the field: `target: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:229:47
[INFO] [stdout]     |
[INFO] [stdout] 229 |                     if let AstNode::IdxAccess(l, of, idx) = left {
[INFO] [stdout]     |                                               ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]    --> src/compiler/cranelift/mod.rs:228:41
[INFO] [stdout]     |
[INFO] [stdout] 228 |                 let AstNode::Identifier(l, name) = left else {
[INFO] [stdout]     |                                         ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1004:26
[INFO] [stdout]      |
[INFO] [stdout] 1004 |                     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: `parent_path`
[INFO] [stdout]     --> src/compiler/cranelift/mod.rs:1799:21
[INFO] [stdout]      |
[INFO] [stdout] 1799 |                 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:806:30
[INFO] [stdout]     |
[INFO] [stdout] 806 |                     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:826:26
[INFO] [stdout]     |
[INFO] [stdout] 826 |                 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 `owner` is never read
[INFO] [stdout]  --> src/compiler/cranelift/value.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct OwnershipTrace {
[INFO] [stdout]   |            -------------- field in this struct
[INFO] [stdout] 7 |     /// Stores the name of the variable that owns the value, if any
[INFO] [stdout] 8 |     owner: OneOf<String, String, StatementIdentifier>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/utils.rs:27:19
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl<T> UseSparingly<T> {
[INFO] [stdout]    | ----------------------- associated function in this implementation
[INFO] [stdout] 27 |     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; 31 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "128382324e6dd3eecc3edbb01413d6de273a9fad55fd2e05045feea32f7f0821", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "128382324e6dd3eecc3edbb01413d6de273a9fad55fd2e05045feea32f7f0821", kill_on_drop: false }`
[INFO] [stdout] 128382324e6dd3eecc3edbb01413d6de273a9fad55fd2e05045feea32f7f0821
