[INFO] cloning repository https://github.com/seansiddens/Nano
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/seansiddens/Nano" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fseansiddens%2FNano", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fseansiddens%2FNano'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7d9faef287f0b003cd6e955d311e30b37328d0e6
[INFO] checking seansiddens/Nano against master#c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fseansiddens%2FNano" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/seansiddens/Nano on toolchain c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/seansiddens/Nano
[INFO] finished tweaking git repo https://github.com/seansiddens/Nano
[INFO] tweaked toml for git repo https://github.com/seansiddens/Nano written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/seansiddens/Nano 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" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 160212c2defb94c1d7d60f247127db2cff3309b51f62df782a88bffff99fdd1a
[INFO] running `Command { std: "docker" "start" "-a" "160212c2defb94c1d7d60f247127db2cff3309b51f62df782a88bffff99fdd1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "160212c2defb94c1d7d60f247127db2cff3309b51f62df782a88bffff99fdd1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "160212c2defb94c1d7d60f247127db2cff3309b51f62df782a88bffff99fdd1a", kill_on_drop: false }`
[INFO] [stdout] 160212c2defb94c1d7d60f247127db2cff3309b51f62df782a88bffff99fdd1a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 05d3f5c745b37176d3dfd00c7707c27d11ad9695efb4c1e66d8180bf815ab1dd
[INFO] running `Command { std: "docker" "start" "-a" "05d3f5c745b37176d3dfd00c7707c27d11ad9695efb4c1e66d8180bf815ab1dd", kill_on_drop: false }`
[INFO] [stderr]     Checking nano v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]  --> src/types.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]  --> src/types.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/types.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | pub enum Binop {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] 7  |     Plus,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 8  |     Minus,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 9  |     Mul,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 10 |     Div,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 11 |     Eq,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 12 |     Ne,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 13 |     Lt,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 14 |     Le,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 15 |     And,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 16 |     Or,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 17 |     Cons,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Binop` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/types.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub enum Expr {
[INFO] [stdout]    |          ---- variants in this enum
[INFO] [stdout] 45 |     EInt(i64),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 46 |     EBool(bool),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 47 |     ENil,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 48 |     EVar(Id),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 49 |     EBin(Binop, Box<Expr>, Box<Expr>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 50 |     EIf(Box<Expr>, Box<Expr>, Box<Expr>),
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 51 |     ELet(Id, Box<Expr>, Box<Expr>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 52 |     EApp(Box<Expr>, Box<Expr>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 53 |     ELam(Id, Box<Expr>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Expr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/types.rs:91:5
[INFO] [stdout]    |
[INFO] [stdout] 90 | pub enum Value {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] 91 |     VInt(i64),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 92 |     VBool(bool),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 93 |     VClos(Env, Id, Expr),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 94 |     VNil,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 95 |     VPair(Box<Value>, Box<Value>),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 96 |     VErr(String),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 97 |     VPrim(fn(Value) -> Value),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `TypeEnv` is never used
[INFO] [stdout]    --> src/types.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 | pub type TypeEnv = HashMap<Id, Poly>;
[INFO] [stdout]     |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Subst` is never used
[INFO] [stdout]    --> src/types.rs:148:10
[INFO] [stdout]     |
[INFO] [stdout] 148 | pub type Subst = HashMap<TVar, Type>;
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `TInt`, `TBool`, `TFunction`, `TVar`, and `TList` are never constructed
[INFO] [stdout]    --> src/types.rs:152:5
[INFO] [stdout]     |
[INFO] [stdout] 151 | pub enum Type {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 152 |     TInt,                            // Int
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 153 |     TBool,                           // Bool
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 154 |     TFunction(Box<Type>, Box<Type>), // function type: T1 -> T2
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 155 |     TVar(TVar),                      //  type variable: a, b, c
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 156 |     TList(Box<Type>),                // list type: [T]
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Type` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Mono` and `Forall` are never constructed
[INFO] [stdout]    --> src/types.rs:161:5
[INFO] [stdout]     |
[INFO] [stdout] 160 | pub enum Poly {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 161 |     Mono(Type),              // mono-type
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 162 |     Forall(TVar, Box<Poly>), // Polymorphic type
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Poly` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lookup_id` is never used
[INFO] [stdout]  --> src/eval.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn lookup_id(env: &Env, id: &Id) -> Value {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extend_env` is never used
[INFO] [stdout]   --> src/eval.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn extend_env(env: &mut Env, id: &Id, val: &Value) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval` is never used
[INFO] [stdout]   --> src/eval.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn eval(env: Env, e: Expr) -> Value {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval_op` is never used
[INFO] [stdout]   --> src/eval.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn eval_op(binop: Binop, val1: Value, val2: Value) -> Value {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `HasTVars` is never used
[INFO] [stdout]  --> src/typecheck.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | trait HasTVars {
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]    --> src/eval.rs:207:13
[INFO] [stdout]     |
[INFO] [stdout] 207 |         let expr = Expr::ELet(
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Eq`, `Ne`, `Le`, `And`, `Or`, and `Cons` are never constructed
[INFO] [stdout]   --> src/types.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | pub enum Binop {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] ...
[INFO] [stdout] 11 |     Eq,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 12 |     Ne,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 13 |     Lt,
[INFO] [stdout] 14 |     Le,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 15 |     And,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 16 |     Or,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 17 |     Cons,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Binop` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `EIf`, `EApp`, and `ELam` are never constructed
[INFO] [stdout]   --> src/types.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub enum Expr {
[INFO] [stdout]    |          ---- variants in this enum
[INFO] [stdout] ...
[INFO] [stdout] 50 |     EIf(Box<Expr>, Box<Expr>, Box<Expr>),
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 51 |     ELet(Id, Box<Expr>, Box<Expr>),
[INFO] [stdout] 52 |     EApp(Box<Expr>, Box<Expr>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 53 |     ELam(Id, Box<Expr>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Expr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `VErr` and `VPrim` are never constructed
[INFO] [stdout]   --> src/types.rs:96:5
[INFO] [stdout]    |
[INFO] [stdout] 90 | pub enum Value {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] ...
[INFO] [stdout] 96 |     VErr(String),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 97 |     VPrim(fn(Value) -> Value),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `TypeEnv` is never used
[INFO] [stdout]    --> src/types.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 | pub type TypeEnv = HashMap<Id, Poly>;
[INFO] [stdout]     |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Subst` is never used
[INFO] [stdout]    --> src/types.rs:148:10
[INFO] [stdout]     |
[INFO] [stdout] 148 | pub type Subst = HashMap<TVar, Type>;
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `TBool` and `TList` are never constructed
[INFO] [stdout]    --> src/types.rs:153:5
[INFO] [stdout]     |
[INFO] [stdout] 151 | pub enum Type {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 152 |     TInt,                            // Int
[INFO] [stdout] 153 |     TBool,                           // Bool
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 156 |     TList(Box<Type>),                // list type: [T]
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Type` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Mono` and `Forall` are never constructed
[INFO] [stdout]    --> src/types.rs:161:5
[INFO] [stdout]     |
[INFO] [stdout] 160 | pub enum Poly {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 161 |     Mono(Type),              // mono-type
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 162 |     Forall(TVar, Box<Poly>), // Polymorphic type
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Poly` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "05d3f5c745b37176d3dfd00c7707c27d11ad9695efb4c1e66d8180bf815ab1dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05d3f5c745b37176d3dfd00c7707c27d11ad9695efb4c1e66d8180bf815ab1dd", kill_on_drop: false }`
[INFO] [stdout] 05d3f5c745b37176d3dfd00c7707c27d11ad9695efb4c1e66d8180bf815ab1dd