[INFO] cloning repository https://github.com/wabain/rstarc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wabain/rstarc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwabain%2Frstarc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwabain%2Frstarc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 23eaa46d645db49f6da854e558b4a9b8adc25f3c
[INFO] checking wabain/rstarc against master#b389b0ab72cb0aa9acf4df0ae0c0e12090782da9 for pr-128351-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwabain%2Frstarc" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wabain/rstarc on toolchain b389b0ab72cb0aa9acf4df0ae0c0e12090782da9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b389b0ab72cb0aa9acf4df0ae0c0e12090782da9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wabain/rstarc
[INFO] finished tweaking git repo https://github.com/wabain/rstarc
[INFO] tweaked toml for git repo https://github.com/wabain/rstarc written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/wabain/rstarc 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" "+b389b0ab72cb0aa9acf4df0ae0c0e12090782da9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: /workspace/builds/worker-3-tc1/source/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /workspace/builds/worker-3-tc1/source/crates/rstarc_types/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded docopt v1.0.1
[INFO] [stderr]   Downloaded block-buffer v0.7.0
[INFO] [stderr]   Downloaded string_cache_codegen v0.4.1
[INFO] [stderr]   Downloaded lalrpop-util v0.16.1
[INFO] [stderr]   Downloaded llvm-sys v60.1.0
[INFO] [stderr]   Downloaded lalrpop v0.16.1
[INFO] [stderr]   Downloaded regex v1.0.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+b389b0ab72cb0aa9acf4df0ae0c0e12090782da9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 29ae13d89ee76dcb73f900db09933c52b8a6259f7c7c2b408ac77234016f66a4
[INFO] running `Command { std: "docker" "start" "-a" "29ae13d89ee76dcb73f900db09933c52b8a6259f7c7c2b408ac77234016f66a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "29ae13d89ee76dcb73f900db09933c52b8a6259f7c7c2b408ac77234016f66a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29ae13d89ee76dcb73f900db09933c52b8a6259f7c7c2b408ac77234016f66a4", kill_on_drop: false }`
[INFO] [stdout] 29ae13d89ee76dcb73f900db09933c52b8a6259f7c7c2b408ac77234016f66a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+b389b0ab72cb0aa9acf4df0ae0c0e12090782da9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c4fb4cbcda741792ba64c253f083b17a5ca3d5d00c3f8bc9ebe64042b23c92b
[INFO] running `Command { std: "docker" "start" "-a" "4c4fb4cbcda741792ba64c253f083b17a5ca3d5d00c3f8bc9ebe64042b23c92b", kill_on_drop: false }`
[INFO] [stderr] warning: /opt/rustwide/workdir/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /opt/rustwide/workdir/crates/rstarc_types/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]    Compiling libc v0.2.42
[INFO] [stderr]    Compiling ucd-util v0.1.1
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling siphasher v0.2.2
[INFO] [stderr]    Compiling memchr v2.1.0
[INFO] [stderr]    Compiling utf8-ranges v1.0.1
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling proc-macro2 v0.3.8
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[INFO] [stderr]    Compiling serde v1.0.70
[INFO] [stderr]    Compiling string_cache_shared v0.3.0
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling quote v0.6.4
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling quote v0.5.2
[INFO] [stderr]    Compiling byte-tools v0.3.0
[INFO] [stderr]    Compiling block-padding v0.1.2
[INFO] [stderr]    Compiling syn v0.14.5
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling regex-syntax v0.6.2
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[INFO] [stderr]    Compiling term v0.4.6
[INFO] [stderr]    Compiling ordermap v0.3.5
[INFO] [stderr]    Compiling string_cache_codegen v0.4.1
[INFO] [stderr]    Compiling block-buffer v0.7.0
[INFO] [stderr]    Compiling digest v0.8.0
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[INFO] [stderr]    Compiling precomputed-hash v0.1.1
[INFO] [stderr]    Compiling strsim v0.7.0
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]    Compiling bit-vec v0.5.0
[INFO] [stderr]    Compiling gcc v0.3.54
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling fixedbitset v0.1.9
[INFO] [stderr]    Compiling opaque-debug v0.2.1
[INFO] [stderr]    Compiling itertools v0.7.8
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling petgraph v0.4.13
[INFO] [stderr]    Compiling bit-set v0.5.0
[INFO] [stderr]    Compiling ascii-canvas v1.0.0
[INFO] [stderr]    Compiling ena v0.10.1
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling lalrpop-util v0.16.1
[INFO] [stderr]    Compiling diff v0.1.11
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking bitflags v1.0.3
[INFO] [stderr]     Checking remove_dir_all v0.5.1
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking bytes v0.4.10
[INFO] [stderr]     Checking smallvec v1.2.0
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking rstarc_types v0.1.0 (/opt/rustwide/workdir/crates/rstarc_types)
[INFO] [stderr]    Compiling llvm-sys v60.1.0
[INFO] [stderr]    Compiling docopt v1.0.1
[INFO] [stderr]    Compiling lalrpop v0.16.1
[INFO] [stderr]    Compiling rstarc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/main.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #[macro_use] extern crate smallvec;
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/base_analysis/scoping.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         (0..self.scope_data.len() as ScopeId)
[INFO] [stdout]     |         ^                                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 108 -         (0..self.scope_data.len() as ScopeId)
[INFO] [stdout] 108 +         0..self.scope_data.len() as ScopeId
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/codegen/simple_ir.rs:808:10
[INFO] [stdout]     |
[INFO] [stdout] 808 |         };
[INFO] [stdout]     |          ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/syntax/ast_print.rs:78:28
[INFO] [stdout]    |
[INFO] [stdout] 78 |     fn ast_print<W>(&self, &mut W, indent: usize) -> io::Result<()> where W: io::Write;
[INFO] [stdout]    |                            ^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut W`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/syntax/ast_walker.rs:48:35
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn visit_statement(&mut self, &'prog Statement) -> Result<(), Self::Error>;
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &'prog Statement`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/syntax/pretty_print.rs:41:31
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn pretty_print<W>(&self, &mut W) -> io::Result<()> where W: io::Write;
[INFO] [stdout]    |                               ^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut W`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]     --> /opt/rustwide/target/debug/build/rstarc-db3f7d539dad1721/out/syntax/parser.rs:4047:5
[INFO] [stdout]      |
[INFO] [stdout] 4047 |     (__0)
[INFO] [stdout]      |     ^   ^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]      |
[INFO] [stdout] 4047 -     (__0)
[INFO] [stdout] 4047 +     __0
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/main.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #[macro_use] extern crate smallvec;
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/base_analysis/scoping.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         (0..self.scope_data.len() as ScopeId)
[INFO] [stdout]     |         ^                                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 108 -         (0..self.scope_data.len() as ScopeId)
[INFO] [stdout] 108 +         0..self.scope_data.len() as ScopeId
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/codegen/simple_ir.rs:808:10
[INFO] [stdout]     |
[INFO] [stdout] 808 |         };
[INFO] [stdout]     |          ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/syntax/ast_print.rs:78:28
[INFO] [stdout]    |
[INFO] [stdout] 78 |     fn ast_print<W>(&self, &mut W, indent: usize) -> io::Result<()> where W: io::Write;
[INFO] [stdout]    |                            ^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut W`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/syntax/ast_walker.rs:48:35
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn visit_statement(&mut self, &'prog Statement) -> Result<(), Self::Error>;
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &'prog Statement`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/syntax/pretty_print.rs:41:31
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn pretty_print<W>(&self, &mut W) -> io::Result<()> where W: io::Write;
[INFO] [stdout]    |                               ^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &mut W`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]     --> /opt/rustwide/target/debug/build/rstarc-db3f7d539dad1721/out/syntax/parser.rs:4047:5
[INFO] [stdout]      |
[INFO] [stdout] 4047 |     (__0)
[INFO] [stdout]      |     ^   ^
[INFO] [stdout]      |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]      |
[INFO] [stdout] 4047 -     (__0)
[INFO] [stdout] 4047 +     __0
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `has_closure` is never used
[INFO] [stdout]    --> src/codegen/simple_ir.rs:382:8
[INFO] [stdout]     |
[INFO] [stdout] 381 | pub (super) trait IRClosure<'prog> {
[INFO] [stdout]     |                   --------- method in this trait
[INFO] [stdout] 382 |     fn has_closure(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `path` is never read
[INFO] [stdout]   --> src/codegen/closure_layout.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub(super) struct CaptureSlot<'prog> {
[INFO] [stdout]    |                   ----------- field in this struct
[INFO] [stdout] 21 |     scope_id: ScopeId,
[INFO] [stdout] 22 |     path: SmallVec<[u32; 4]>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CaptureSlot` has derived impls for the traits `Default` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `scope_id` is never read
[INFO] [stdout]   --> src/codegen/closure_layout.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub(super) struct ClosureLayout<'prog> {
[INFO] [stdout]    |                   ------------- field in this struct
[INFO] [stdout] 28 |     scope_id: ScopeId,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ClosureLayout` has derived impls for the traits `Default` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/interpreter.rs:368:13
[INFO] [stdout]     |
[INFO] [stdout] 368 |             mem::replace(&mut self.scope, old_scope);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 368 |             let _ = mem::replace(&mut self.scope, old_scope);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `has_closure` is never used
[INFO] [stdout]    --> src/codegen/simple_ir.rs:382:8
[INFO] [stdout]     |
[INFO] [stdout] 381 | pub (super) trait IRClosure<'prog> {
[INFO] [stdout]     |                   --------- method in this trait
[INFO] [stdout] 382 |     fn has_closure(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `path` is never read
[INFO] [stdout]   --> src/codegen/closure_layout.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub(super) struct CaptureSlot<'prog> {
[INFO] [stdout]    |                   ----------- field in this struct
[INFO] [stdout] 21 |     scope_id: ScopeId,
[INFO] [stdout] 22 |     path: SmallVec<[u32; 4]>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CaptureSlot` has derived impls for the traits `Default` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `scope_id` is never read
[INFO] [stdout]   --> src/codegen/closure_layout.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub(super) struct ClosureLayout<'prog> {
[INFO] [stdout]    |                   ------------- field in this struct
[INFO] [stdout] 28 |     scope_id: ScopeId,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ClosureLayout` has derived impls for the traits `Default` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/interpreter.rs:368:13
[INFO] [stdout]     |
[INFO] [stdout] 368 |             mem::replace(&mut self.scope, old_scope);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 368 |             let _ = mem::replace(&mut self.scope, old_scope);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 50.23s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: lalrpop v0.16.1, syn v0.14.5
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "4c4fb4cbcda741792ba64c253f083b17a5ca3d5d00c3f8bc9ebe64042b23c92b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c4fb4cbcda741792ba64c253f083b17a5ca3d5d00c3f8bc9ebe64042b23c92b", kill_on_drop: false }`
[INFO] [stdout] 4c4fb4cbcda741792ba64c253f083b17a5ca3d5d00c3f8bc9ebe64042b23c92b
