[INFO] fetching crate auto_from 0.3.0...
[INFO] checking auto_from-0.3.0 against master#b0696a5160711c068cb1f01b7437db7990d15750 for pr-121848
[INFO] extracting crate auto_from 0.3.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate auto_from 0.3.0 on toolchain b0696a5160711c068cb1f01b7437db7990d15750
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate auto_from 0.3.0
[INFO] finished tweaking crates.io crate auto_from 0.3.0
[INFO] tweaked toml for crates.io crate auto_from 0.3.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f055606267925b26dd756631e57ea5070e2ed87cdb9db2c1b54d27027928a789
[INFO] running `Command { std: "docker" "start" "-a" "f055606267925b26dd756631e57ea5070e2ed87cdb9db2c1b54d27027928a789", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f055606267925b26dd756631e57ea5070e2ed87cdb9db2c1b54d27027928a789", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f055606267925b26dd756631e57ea5070e2ed87cdb9db2c1b54d27027928a789", kill_on_drop: false }`
[INFO] [stdout] f055606267925b26dd756631e57ea5070e2ed87cdb9db2c1b54d27027928a789
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 78d5ebdfe8f4468ca25c32cb4eef72d7ab229fbf6bd4647efc2dc07662a2aa8e
[INFO] running `Command { std: "docker" "start" "-a" "78d5ebdfe8f4468ca25c32cb4eef72d7ab229fbf6bd4647efc2dc07662a2aa8e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]     Checking unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]     Checking auto_from v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&syn::Field` instead of cloning the inner type
[INFO] [stdout]   --> src/lib.rs:79:69
[INFO] [stdout]    |
[INFO] [stdout] 79 |             Some(ref pair) if named.named.len() == 1 => pair.value().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 `&syn::Field` instead of cloning the inner type
[INFO] [stdout]   --> src/lib.rs:83:73
[INFO] [stdout]    |
[INFO] [stdout] 83 |             Some(ref pair) if unnamed.unnamed.len() == 1 => pair.value().clone(),
[INFO] [stdout]    |                                                                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&syn::Field` instead of cloning the inner type
[INFO] [stdout]   --> src/lib.rs:79:69
[INFO] [stdout]    |
[INFO] [stdout] 79 |             Some(ref pair) if named.named.len() == 1 => pair.value().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 `&syn::Field` instead of cloning the inner type
[INFO] [stdout]   --> src/lib.rs:83:73
[INFO] [stdout]    |
[INFO] [stdout] 83 |             Some(ref pair) if unnamed.unnamed.len() == 1 => pair.value().clone(),
[INFO] [stdout]    |                                                                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&syn::Field` instead of cloning the inner type
[INFO] [stdout]   --> src/lib.rs:79:69
[INFO] [stdout]    |
[INFO] [stdout] 79 |             Some(ref pair) if named.named.len() == 1 => pair.value().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 `&syn::Field` instead of cloning the inner type
[INFO] [stdout]   --> src/lib.rs:83:73
[INFO] [stdout]    |
[INFO] [stdout] 83 |             Some(ref pair) if unnamed.unnamed.len() == 1 => pair.value().clone(),
[INFO] [stdout]    |                                                                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/named_fields.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Int(i32),
[INFO] [stdout]   |     --- ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[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] 5 |     Int(()),
[INFO] [stdout]   |         ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> examples/named_fields.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Long { value: i64 },
[INFO] [stdout]   |     ----   ^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/skip.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Int(i32),
[INFO] [stdout]   |     --- ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[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] 7 |     Int(()),
[INFO] [stdout]   |         ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/basic.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Int(i32),
[INFO] [stdout]   |     --- ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[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] 5 |     Int(()),
[INFO] [stdout]   |         ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/skip.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Double(f64),
[INFO] [stdout]   |     ------ ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[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] 8 |     Double(()),
[INFO] [stdout]   |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `SkippedInt` is never constructed
[INFO] [stdout]  --> examples/skip.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Foo {
[INFO] [stdout]   |      --- variant in this enum
[INFO] [stdout] 5 |     #[auto_from(skip)]
[INFO] [stdout] 6 |     SkippedInt(i32),
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Foo` 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/basic.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Double(f64),
[INFO] [stdout]   |     ------ ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[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] 6 |     Double(()),
[INFO] [stdout]   |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.62s
[INFO] running `Command { std: "docker" "inspect" "78d5ebdfe8f4468ca25c32cb4eef72d7ab229fbf6bd4647efc2dc07662a2aa8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78d5ebdfe8f4468ca25c32cb4eef72d7ab229fbf6bd4647efc2dc07662a2aa8e", kill_on_drop: false }`
[INFO] [stdout] 78d5ebdfe8f4468ca25c32cb4eef72d7ab229fbf6bd4647efc2dc07662a2aa8e
