[INFO] fetching crate filter_ast 0.2.1...
[INFO] checking filter_ast-0.2.1 against 5c543b0b8c73c7b72bc8284ced4fb22ead15734d for pr-160186
[INFO] extracting crate filter_ast 0.2.1 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate filter_ast 0.2.1
[INFO] finished tweaking crates.io crate filter_ast 0.2.1
[INFO] tweaked toml for crates.io crate filter_ast 0.2.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate filter_ast 0.2.1 on toolchain 5c543b0b8c73c7b72bc8284ced4fb22ead15734d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5c543b0b8c73c7b72bc8284ced4fb22ead15734d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate filter_ast 0.2.1 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" "+5c543b0b8c73c7b72bc8284ced4fb22ead15734d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v1.0.81
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d
[INFO] running `Command { std: "docker" "start" "e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d" "/opt/rustwide/cargo-home/bin/cargo" "+5c543b0b8c73c7b72bc8284ced4fb22ead15734d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d" "/opt/rustwide/cargo-home/bin/cargo" "+5c543b0b8c73c7b72bc8284ced4fb22ead15734d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking filter_ast v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/visit.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |         std::mem::drop(clause);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^------^
[INFO] [stdout]    |                        |
[INFO] [stdout]    |                        argument has type `&Clause<F, P, O>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 12 -         std::mem::drop(clause);
[INFO] [stdout] 12 +         let _ = clause;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/visit.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |         std::mem::drop(clause);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^------^
[INFO] [stdout]    |                        |
[INFO] [stdout]    |                        argument has type `&Clause<F, P, O>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 12 -         std::mem::drop(clause);
[INFO] [stdout] 12 +         let _ = clause;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/lib.rs:607:42
[INFO] [stdout]     |
[INFO] [stdout] 607 |                         clause.operator().clone(),
[INFO] [stdout]     |                                          ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/lib.rs:608:41
[INFO] [stdout]     |
[INFO] [stdout] 608 |                         clause.operand().clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/lib.rs:612:42
[INFO] [stdout]     |
[INFO] [stdout] 612 |                         clause.operator().clone(),
[INFO] [stdout]     |                                          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/lib.rs:613:41
[INFO] [stdout]     |
[INFO] [stdout] 613 |                         clause.operand().clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/lib.rs:617:42
[INFO] [stdout]     |
[INFO] [stdout] 617 |                         clause.operator().clone(),
[INFO] [stdout]     |                                          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/lib.rs:618:41
[INFO] [stdout]     |
[INFO] [stdout] 618 |                         clause.operand().clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/lib.rs:622:42
[INFO] [stdout]     |
[INFO] [stdout] 622 |                         clause.operator().clone(),
[INFO] [stdout]     |                                          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/lib.rs:623:41
[INFO] [stdout]     |
[INFO] [stdout] 623 |                         clause.operand().clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Tag` is never constructed
[INFO] [stdout]  --> examples/schema_validation.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum Field {
[INFO] [stdout]   |      ----- variant in this enum
[INFO] [stdout] 7 |     Name,
[INFO] [stdout] 8 |     Tag,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Field` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> examples/schema_validation.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 |     Text(String),
[INFO] [stdout]    |     ---- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Operand` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 21 -     Text(String),
[INFO] [stdout] 21 +     Text(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> examples/schema_validation.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     IpAddr(IpAddr),
[INFO] [stdout]    |     ------ ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Operand` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 22 -     IpAddr(IpAddr),
[INFO] [stdout] 22 +     IpAddr(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `seen` and `expected` are never read
[INFO] [stdout]   --> examples/schema_validation.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     InvalidOperator {
[INFO] [stdout]    |     --------------- fields in this variant
[INFO] [stdout] 66 |         seen: Operator,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 67 |         expected: &'static [Operator],
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ClauseError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> examples/schema_validation.rs:69:11
[INFO] [stdout]    |
[INFO] [stdout] 69 |     Parse(AddrParseError),
[INFO] [stdout]    |     ----- ^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ClauseError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 69 -     Parse(AddrParseError),
[INFO] [stdout] 69 +     Parse(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `error` and `path` are never read
[INFO] [stdout]   --> examples/schema_validation.rs:89:5
[INFO] [stdout]    |
[INFO] [stdout] 88 | struct Error {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 89 |     error: ClauseError,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 90 |     /// Path to clause, expressed as tree rule indices starting from the root
[INFO] [stdout] 91 |     path: Vec<usize>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Error` 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 0.30s
[INFO] running `Command { std: "docker" "inspect" "e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d", kill_on_drop: false }`
[INFO] [stdout] e5199abc2d54d22bbde7a3ad84629eb8df5f404bdaa88e21eca69280453ca22d
