[INFO] updating cached repository https://github.com/memoryleak47/constraint-lang
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a17e347d8fe9b30c8533ab65fc57a1288bbf5dc6
[INFO] checking memoryleak47/constraint-lang against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmemoryleak47%2Fconstraint-lang" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/memoryleak47/constraint-lang on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/memoryleak47/constraint-lang
[INFO] finished tweaking git repo https://github.com/memoryleak47/constraint-lang
[INFO] tweaked toml for git repo https://github.com/memoryleak47/constraint-lang written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/memoryleak47/constraint-lang already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 01b75a05540f1ed593b619a76ad674292bc13edd8b8b7dffcf4f16240104963d
[INFO] running `"docker" "start" "-a" "01b75a05540f1ed593b619a76ad674292bc13edd8b8b7dffcf4f16240104963d"`
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]     Checking productivity-lang-compiler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variant is never constructed: `String`
[INFO] [stderr]    --> src/ast/mod.rs:154:2
[INFO] [stderr]     |
[INFO] [stderr] 154 |     String(String),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Null`
[INFO] [stderr]    --> src/ast/mod.rs:156:2
[INFO] [stderr]     |
[INFO] [stderr] 156 |     Null, // the `null` expression
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Array`
[INFO] [stderr]    --> src/ast/mod.rs:159:2
[INFO] [stderr]     |
[INFO] [stderr] 159 |     Array(Vec<Expr>),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Tuple`
[INFO] [stderr]    --> src/ast/mod.rs:160:2
[INFO] [stderr]     |
[INFO] [stderr] 160 |     Tuple(Vec<Expr>),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Object`
[INFO] [stderr]    --> src/ast/mod.rs:161:2
[INFO] [stderr]     |
[INFO] [stderr] 161 |     Object(HashMap<String, Box<Expr>>), // { f = 2 }
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `dealloc`
[INFO] [stderr]   --> src/exec/heap.rs:27:2
[INFO] [stderr]    |
[INFO] [stderr] 27 |     pub fn dealloc(&mut self, index: usize) -> Option<V> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `String`
[INFO] [stderr]    --> src/ast/mod.rs:154:2
[INFO] [stderr]     |
[INFO] [stderr] 154 |     String(String),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Null`
[INFO] [stderr]    --> src/ast/mod.rs:156:2
[INFO] [stderr]     |
[INFO] [stderr] 156 |     Null, // the `null` expression
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Array`
[INFO] [stderr]    --> src/ast/mod.rs:159:2
[INFO] [stderr]     |
[INFO] [stderr] 159 |     Array(Vec<Expr>),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Tuple`
[INFO] [stderr]    --> src/ast/mod.rs:160:2
[INFO] [stderr]     |
[INFO] [stderr] 160 |     Tuple(Vec<Expr>),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Object`
[INFO] [stderr]    --> src/ast/mod.rs:161:2
[INFO] [stderr]     |
[INFO] [stderr] 161 |     Object(HashMap<String, Box<Expr>>), // { f = 2 }
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `dealloc`
[INFO] [stderr]   --> src/exec/heap.rs:27:2
[INFO] [stderr]    |
[INFO] [stderr] 27 |     pub fn dealloc(&mut self, index: usize) -> Option<V> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.37s
[INFO] running `"docker" "inspect" "01b75a05540f1ed593b619a76ad674292bc13edd8b8b7dffcf4f16240104963d"`
[INFO] running `"docker" "rm" "-f" "01b75a05540f1ed593b619a76ad674292bc13edd8b8b7dffcf4f16240104963d"`
[INFO] [stdout] 01b75a05540f1ed593b619a76ad674292bc13edd8b8b7dffcf4f16240104963d