[INFO] cloning repository https://github.com/arlopurcell/zax
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arlopurcell/zax" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farlopurcell%2Fzax", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farlopurcell%2Fzax'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c1f23c7850b3c845f818878e3a362fbfabbfa60c
[INFO] checking arlopurcell/zax against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farlopurcell%2Fzax" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/arlopurcell/zax on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/arlopurcell/zax
[INFO] finished tweaking git repo https://github.com/arlopurcell/zax
[INFO] tweaked toml for git repo https://github.com/arlopurcell/zax written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/arlopurcell/zax already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 15a4e5e4f7d86d04ebc0c92cf5ed6225e5b4a661667954c8ad07fe0d9998a01e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "15a4e5e4f7d86d04ebc0c92cf5ed6225e5b4a661667954c8ad07fe0d9998a01e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15a4e5e4f7d86d04ebc0c92cf5ed6225e5b4a661667954c8ad07fe0d9998a01e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15a4e5e4f7d86d04ebc0c92cf5ed6225e5b4a661667954c8ad07fe0d9998a01e", kill_on_drop: false }`
[INFO] [stdout] 15a4e5e4f7d86d04ebc0c92cf5ed6225e5b4a661667954c8ad07fe0d9998a01e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 09999a238b7cb493253c0e8aa8e8ef17f7e6a9cbaee045412d0c11c5f4411ebf
[INFO] running `Command { std: "docker" "start" "-a" "09999a238b7cb493253c0e8aa8e8ef17f7e6a9cbaee045412d0c11c5f4411ebf", kill_on_drop: false }`
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking predicates-core v1.0.0
[INFO] [stderr]     Checking treeline v0.1.0
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking zax v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking predicates-tree v1.0.0
[INFO] [stderr]     Checking predicates v1.0.5
[INFO] [stdout] warning: unused imports: `final_type_check`, `generate_substitutions`
[INFO] [stdout]  --> src/compiler.rs:7:25
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::type_check::{final_type_check, generate_substitutions};
[INFO] [stdout]   |                         ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::object::FunctionObj`
[INFO] [stdout]  --> src/parser.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::object::FunctionObj;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ast.rs:704:35
[INFO] [stdout]     |
[INFO] [stdout] 704 |             AstNodeType::Variable{name, type_annotation: _, location} => {
[INFO] [stdout]     |                                   ^^^^ help: try ignoring the field: `name: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `location`
[INFO] [stdout]    --> src/ast.rs:704:61
[INFO] [stdout]     |
[INFO] [stdout] 704 |             AstNodeType::Variable{name, type_annotation: _, location} => {
[INFO] [stdout]     |                                                             ^^^^^^^^ help: try ignoring the field: `location: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bytes`
[INFO] [stdout]   --> src/object.rs:48:30
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn update(&mut self, bytes: &[u8]) -> () {
[INFO] [stdout]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_bytes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/object.rs:90:24
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub fn exec(&self, args: &[u8]) -> Vec<u8> {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/vm.rs:450:42
[INFO] [stdout]     |
[INFO] [stdout] 450 |                 ByteCode::GetHeap(index, n) => {
[INFO] [stdout]     |                                          ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking assert_cmd v1.0.1
[INFO] [stdout] warning: associated function is never used: `to_bytes`
[INFO] [stdout]    --> src/chunk.rs:243:8
[INFO] [stdout]     |
[INFO] [stdout] 243 |     fn to_bytes(mut self) -> Vec<u8> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_bytes`
[INFO] [stdout]    --> src/chunk.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn from_bytes(bytes: &[u8]) -> Self {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Bug`
[INFO] [stdout]  --> src/common.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Bug,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `UnaryLeft`
[INFO] [stdout]    --> src/parser.rs:594:5
[INFO] [stdout]     |
[INFO] [stdout] 594 |     UnaryLeft,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `PrimaryLeft`
[INFO] [stdout]    --> src/parser.rs:598:5
[INFO] [stdout]     |
[INFO] [stdout] 598 |     PrimaryLeft,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `PrimaryRight`
[INFO] [stdout]    --> src/parser.rs:599:5
[INFO] [stdout]     |
[INFO] [stdout] 599 |     PrimaryRight,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Unknown`
[INFO] [stdout]    --> src/type_check.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 101 |     Unknown,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `UnknownFunction`
[INFO] [stdout]    --> src/type_check.rs:102:5
[INFO] [stdout]     |
[INFO] [stdout] 102 |     UnknownFunction(String),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ArgNumber`
[INFO] [stdout]    --> src/type_check.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout] 103 |     ArgNumber(usize, usize),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Scope`
[INFO] [stdout]  --> src/variable.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Scope {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Variable`
[INFO] [stdout]  --> src/variable.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Variable {
[INFO] [stdout]   |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_bytes_8`
[INFO] [stdout]    --> src/vm.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn peek_bytes_8(&self) -> &[u8] {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/ast.rs:486:25
[INFO] [stdout]     |
[INFO] [stdout] 486 |                         lhs.generate_with_lvalue(generator, heap, true);
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `final_type_check`, `generate_substitutions`
[INFO] [stdout]  --> src/compiler.rs:7:25
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::type_check::{final_type_check, generate_substitutions};
[INFO] [stdout]   |                         ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::object::FunctionObj`
[INFO] [stdout]  --> src/parser.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::object::FunctionObj;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ast.rs:704:35
[INFO] [stdout]     |
[INFO] [stdout] 704 |             AstNodeType::Variable{name, type_annotation: _, location} => {
[INFO] [stdout]     |                                   ^^^^ help: try ignoring the field: `name: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `location`
[INFO] [stdout]    --> src/ast.rs:704:61
[INFO] [stdout]     |
[INFO] [stdout] 704 |             AstNodeType::Variable{name, type_annotation: _, location} => {
[INFO] [stdout]     |                                                             ^^^^^^^^ help: try ignoring the field: `location: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bytes`
[INFO] [stdout]   --> src/object.rs:48:30
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn update(&mut self, bytes: &[u8]) -> () {
[INFO] [stdout]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_bytes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]   --> src/object.rs:90:24
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub fn exec(&self, args: &[u8]) -> Vec<u8> {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/vm.rs:450:42
[INFO] [stdout]     |
[INFO] [stdout] 450 |                 ByteCode::GetHeap(index, n) => {
[INFO] [stdout]     |                                          ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_bytes`
[INFO] [stdout]    --> src/chunk.rs:243:8
[INFO] [stdout]     |
[INFO] [stdout] 243 |     fn to_bytes(mut self) -> Vec<u8> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_bytes`
[INFO] [stdout]    --> src/chunk.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn from_bytes(bytes: &[u8]) -> Self {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Bug`
[INFO] [stdout]  --> src/common.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Bug,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `UnaryLeft`
[INFO] [stdout]    --> src/parser.rs:594:5
[INFO] [stdout]     |
[INFO] [stdout] 594 |     UnaryLeft,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `PrimaryLeft`
[INFO] [stdout]    --> src/parser.rs:598:5
[INFO] [stdout]     |
[INFO] [stdout] 598 |     PrimaryLeft,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `PrimaryRight`
[INFO] [stdout]    --> src/parser.rs:599:5
[INFO] [stdout]     |
[INFO] [stdout] 599 |     PrimaryRight,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Unknown`
[INFO] [stdout]    --> src/type_check.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 101 |     Unknown,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `UnknownFunction`
[INFO] [stdout]    --> src/type_check.rs:102:5
[INFO] [stdout]     |
[INFO] [stdout] 102 |     UnknownFunction(String),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ArgNumber`
[INFO] [stdout]    --> src/type_check.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout] 103 |     ArgNumber(usize, usize),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Scope`
[INFO] [stdout]  --> src/variable.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Scope {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Variable`
[INFO] [stdout]  --> src/variable.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Variable {
[INFO] [stdout]   |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_bytes_8`
[INFO] [stdout]    --> src/vm.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn peek_bytes_8(&self) -> &[u8] {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/ast.rs:486:25
[INFO] [stdout]     |
[INFO] [stdout] 486 |                         lhs.generate_with_lvalue(generator, heap, true);
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.20s
[INFO] running `Command { std: "docker" "inspect" "09999a238b7cb493253c0e8aa8e8ef17f7e6a9cbaee045412d0c11c5f4411ebf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09999a238b7cb493253c0e8aa8e8ef17f7e6a9cbaee045412d0c11c5f4411ebf", kill_on_drop: false }`
[INFO] [stdout] 09999a238b7cb493253c0e8aa8e8ef17f7e6a9cbaee045412d0c11c5f4411ebf