[INFO] updating cached repository https://github.com/pigeon-project/pigeon_core
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 26fb18ab2ea1e15289838e10f40ea80adf88cd2f
[INFO] testing pigeon-project/pigeon_core against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpigeon-project%2Fpigeon_core" "/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/pigeon-project/pigeon_core on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/pigeon-project/pigeon_core
[INFO] finished tweaking git repo https://github.com/pigeon-project/pigeon_core
[INFO] tweaked toml for git repo https://github.com/pigeon-project/pigeon_core written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/pigeon-project/pigeon_core already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8391aa9559f4248fdf125a4a2c0b8fc929b6770638d8bdda16256a61357edf93
[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" "8391aa9559f4248fdf125a4a2c0b8fc929b6770638d8bdda16256a61357edf93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8391aa9559f4248fdf125a4a2c0b8fc929b6770638d8bdda16256a61357edf93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8391aa9559f4248fdf125a4a2c0b8fc929b6770638d8bdda16256a61357edf93", kill_on_drop: false }`
[INFO] [stdout] 8391aa9559f4248fdf125a4a2c0b8fc929b6770638d8bdda16256a61357edf93
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--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] 1bb50761290592077ba429d931a5e2299f674d121d3dfeaea849627397d093b7
[INFO] running `Command { std: "docker" "start" "-a" "1bb50761290592077ba429d931a5e2299f674d121d3dfeaea849627397d093b7", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.46
[INFO] [stderr]    Compiling pigeon_core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `serde::export::fmt::Error`
[INFO] [stdout]  --> src/mata_info/ast.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use serde::export::fmt::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde::export::Formatter`
[INFO] [stdout]  --> src/mata_info/ast.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::export::Formatter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::path::Display`
[INFO] [stdout]  --> src/mata_info/ast.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::path::Display;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::fs::File;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde_json`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mata_info::ast`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use mata_info::ast;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mata_info::ast::Expr`
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use mata_info::ast::Expr;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mata_info::ast::Literal::Bool`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use mata_info::ast::Literal::Bool;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]   --> src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use std::cell::RefCell;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem::size_of`
[INFO] [stdout]   --> src/main.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | use std::mem::size_of;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]    --> src/type_checker.rs:108:20
[INFO] [stdout]     |
[INFO] [stdout] 108 |                 Ok(res) => unimplemented!(),
[INFO] [stdout]     |                    ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tree_node_assert`
[INFO] [stdout]   --> src/mata_info/node.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn tree_node_assert(&self) -> bool {
[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: `lit2ast`
[INFO] [stdout]   --> src/mata_info/node.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn lit2ast<T: std::str::FromStr>(&self, fun: fn(T) -> ast::Literal) -> Result<Expr, ()> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_ast`
[INFO] [stdout]   --> src/mata_info/node.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn to_ast(&self) -> Result<Expr, ()> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `CompileResult`
[INFO] [stdout]   --> src/mata_info/ast.rs:34:1
[INFO] [stdout]    |
[INFO] [stdout] 34 | pub type CompileResult<T> = Result<T, Vec<CompileError>>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unpack`
[INFO] [stdout]    --> src/mata_info/ast.rs:186:8
[INFO] [stdout]     |
[INFO] [stdout] 186 |     fn unpack(self) -> Expr {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `TYPE_ASSERT_ERR`
[INFO] [stdout]  --> src/type_checker.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const TYPE_ASSERT_ERR: RErrorInfo = ("T0", "Expression type assertion error");
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `CALLEE_IS_NOT_FUNCTION_TYPE`
[INFO] [stdout]  --> src/type_checker.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | const CALLEE_IS_NOT_FUNCTION_TYPE: RErrorInfo = ("T1", "Callee is not a function type");
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `VARIABLE_IS_NOT_DEFINED`
[INFO] [stdout]  --> src/type_checker.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | const VARIABLE_IS_NOT_DEFINED: RErrorInfo = ("T2", "Variable is not defined");
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `UNIFICATION_ERROR`
[INFO] [stdout]  --> src/type_checker.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | const UNIFICATION_ERROR: &'static str = "T3";
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `new_path_level`
[INFO] [stdout]  --> src/type_checker.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn new_path_level(path: &Path, pos: u64) -> Path {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `make_unification_error`
[INFO] [stdout]   --> src/type_checker.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn make_unification_error(i: String) -> Result<(), ErrorInfo> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unifier`
[INFO] [stdout]   --> src/type_checker.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn unifier(ty1: &TypeExpr, ty2: &TypeExpr) -> Result<(), ErrorInfo> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `literal_infer`
[INFO] [stdout]   --> src/type_checker.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn literal_infer(lit: Literal) -> TypeExpr {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `expr_infer`
[INFO] [stdout]   --> src/type_checker.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn expr_infer(context: &Context, expr: Expr, path: Path) -> CompileResult<TypeExpr> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.77s
[INFO] running `Command { std: "docker" "inspect" "1bb50761290592077ba429d931a5e2299f674d121d3dfeaea849627397d093b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bb50761290592077ba429d931a5e2299f674d121d3dfeaea849627397d093b7", kill_on_drop: false }`
[INFO] [stdout] 1bb50761290592077ba429d931a5e2299f674d121d3dfeaea849627397d093b7
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen" "--no-run" "--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] 7da8ffe1d81e9bb6ccc901e8e57b67d6cfeaac65c0627202113f6aff45c93435
[INFO] running `Command { std: "docker" "start" "-a" "7da8ffe1d81e9bb6ccc901e8e57b67d6cfeaac65c0627202113f6aff45c93435", kill_on_drop: false }`
[INFO] [stderr]    Compiling pigeon_core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `serde::export::fmt::Error`
[INFO] [stdout]  --> src/mata_info/ast.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use serde::export::fmt::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde::export::Formatter`
[INFO] [stdout]  --> src/mata_info/ast.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::export::Formatter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::path::Display`
[INFO] [stdout]  --> src/mata_info/ast.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::path::Display;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::fs::File;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mata_info::ast`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use mata_info::ast;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]   --> src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use std::cell::RefCell;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem::size_of`
[INFO] [stdout]   --> src/main.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | use std::mem::size_of;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]    --> src/type_checker.rs:108:20
[INFO] [stdout]     |
[INFO] [stdout] 108 |                 Ok(res) => unimplemented!(),
[INFO] [stdout]     |                    ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tree_node_assert`
[INFO] [stdout]   --> src/mata_info/node.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn tree_node_assert(&self) -> bool {
[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: `lit2ast`
[INFO] [stdout]   --> src/mata_info/node.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn lit2ast<T: std::str::FromStr>(&self, fun: fn(T) -> ast::Literal) -> Result<Expr, ()> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_ast`
[INFO] [stdout]   --> src/mata_info/node.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn to_ast(&self) -> Result<Expr, ()> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `CompileResult`
[INFO] [stdout]   --> src/mata_info/ast.rs:34:1
[INFO] [stdout]    |
[INFO] [stdout] 34 | pub type CompileResult<T> = Result<T, Vec<CompileError>>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unpack`
[INFO] [stdout]    --> src/mata_info/ast.rs:186:8
[INFO] [stdout]     |
[INFO] [stdout] 186 |     fn unpack(self) -> Expr {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `TYPE_ASSERT_ERR`
[INFO] [stdout]  --> src/type_checker.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const TYPE_ASSERT_ERR: RErrorInfo = ("T0", "Expression type assertion error");
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `CALLEE_IS_NOT_FUNCTION_TYPE`
[INFO] [stdout]  --> src/type_checker.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | const CALLEE_IS_NOT_FUNCTION_TYPE: RErrorInfo = ("T1", "Callee is not a function type");
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `VARIABLE_IS_NOT_DEFINED`
[INFO] [stdout]  --> src/type_checker.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | const VARIABLE_IS_NOT_DEFINED: RErrorInfo = ("T2", "Variable is not defined");
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `UNIFICATION_ERROR`
[INFO] [stdout]  --> src/type_checker.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | const UNIFICATION_ERROR: &'static str = "T3";
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `new_path_level`
[INFO] [stdout]  --> src/type_checker.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn new_path_level(path: &Path, pos: u64) -> Path {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `make_unification_error`
[INFO] [stdout]   --> src/type_checker.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn make_unification_error(i: String) -> Result<(), ErrorInfo> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unifier`
[INFO] [stdout]   --> src/type_checker.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn unifier(ty1: &TypeExpr, ty2: &TypeExpr) -> Result<(), ErrorInfo> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `literal_infer`
[INFO] [stdout]   --> src/type_checker.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn literal_infer(lit: Literal) -> TypeExpr {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `expr_infer`
[INFO] [stdout]   --> src/type_checker.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn expr_infer(context: &Context, expr: Expr, path: Path) -> CompileResult<TypeExpr> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 23 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.24s
[INFO] running `Command { std: "docker" "inspect" "7da8ffe1d81e9bb6ccc901e8e57b67d6cfeaac65c0627202113f6aff45c93435", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7da8ffe1d81e9bb6ccc901e8e57b67d6cfeaac65c0627202113f6aff45c93435", kill_on_drop: false }`
[INFO] [stdout] 7da8ffe1d81e9bb6ccc901e8e57b67d6cfeaac65c0627202113f6aff45c93435
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] a37c976d734317663cdbce3964d9080b274e399b9805d44f95dff10c50a8471c
[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" "a37c976d734317663cdbce3964d9080b274e399b9805d44f95dff10c50a8471c", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused import: `serde::export::fmt::Error`
[INFO] [stdout] running 1 test
[INFO] [stderr]  --> src/mata_info/ast.rs:1:5
[INFO] [stdout] test write_expr ... ok
[INFO] [stderr]   |
[INFO] [stdout] 
[INFO] [stderr] 1 | use serde::export::fmt::Error;
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde::export::Formatter`
[INFO] [stderr]  --> src/mata_info/ast.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use serde::export::Formatter;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::path::Display`
[INFO] [stderr]  --> src/mata_info/ast.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::path::Display;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `mata_info::ast`
[INFO] [stderr]   --> src/main.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use mata_info::ast;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cell::RefCell`
[INFO] [stderr]   --> src/main.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 | use std::cell::RefCell;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::mem::size_of`
[INFO] [stderr]   --> src/main.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | use std::mem::size_of;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]    --> src/type_checker.rs:108:20
[INFO] [stderr]     |
[INFO] [stderr] 108 |                 Ok(res) => unimplemented!(),
[INFO] [stderr]     |                    ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `tree_node_assert`
[INFO] [stderr]   --> src/mata_info/node.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn tree_node_assert(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `lit2ast`
[INFO] [stderr]   --> src/mata_info/node.rs:25:8
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn lit2ast<T: std::str::FromStr>(&self, fun: fn(T) -> ast::Literal) -> Result<Expr, ()> {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_ast`
[INFO] [stderr]   --> src/mata_info/node.rs:36:8
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fn to_ast(&self) -> Result<Expr, ()> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `CompileResult`
[INFO] [stderr]   --> src/mata_info/ast.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | pub type CompileResult<T> = Result<T, Vec<CompileError>>;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `unpack`
[INFO] [stderr]    --> src/mata_info/ast.rs:186:8
[INFO] [stderr]     |
[INFO] [stderr] 186 |     fn unpack(self) -> Expr {
[INFO] [stderr]     |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `TYPE_ASSERT_ERR`
[INFO] [stderr]  --> src/type_checker.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | const TYPE_ASSERT_ERR: RErrorInfo = ("T0", "Expression type assertion error");
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `CALLEE_IS_NOT_FUNCTION_TYPE`
[INFO] [stderr]  --> src/type_checker.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | const CALLEE_IS_NOT_FUNCTION_TYPE: RErrorInfo = ("T1", "Callee is not a function type");
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `VARIABLE_IS_NOT_DEFINED`
[INFO] [stderr]  --> src/type_checker.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | const VARIABLE_IS_NOT_DEFINED: RErrorInfo = ("T2", "Variable is not defined");
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `UNIFICATION_ERROR`
[INFO] [stderr]  --> src/type_checker.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | const UNIFICATION_ERROR: &'static str = "T3";
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `new_path_level`
[INFO] [stderr]  --> src/type_checker.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn new_path_level(path: &Path, pos: u64) -> Path {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `make_unification_error`
[INFO] [stderr]   --> src/type_checker.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn make_unification_error(i: String) -> Result<(), ErrorInfo> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `unifier`
[INFO] [stderr]   --> src/type_checker.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn unifier(ty1: &TypeExpr, ty2: &TypeExpr) -> Result<(), ErrorInfo> {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `literal_infer`
[INFO] [stderr]   --> src/type_checker.rs:43:4
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn literal_infer(lit: Literal) -> TypeExpr {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expr_infer`
[INFO] [stderr]   --> src/type_checker.rs:69:4
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn expr_infer(context: &Context, expr: Expr, path: Path) -> CompileResult<TypeExpr> {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 23 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.10s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/pigeon_core-f8fb83c36bcb6adb
[INFO] running `Command { std: "docker" "inspect" "a37c976d734317663cdbce3964d9080b274e399b9805d44f95dff10c50a8471c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a37c976d734317663cdbce3964d9080b274e399b9805d44f95dff10c50a8471c", kill_on_drop: false }`
[INFO] [stdout] a37c976d734317663cdbce3964d9080b274e399b9805d44f95dff10c50a8471c