[INFO] crate runng_derive 0.1.0 is already in cache
[INFO] extracting crate runng_derive 0.1.0 into work/ex/clippy-test-run/sources/stable/reg/runng_derive/0.1.0
[INFO] extracting crate runng_derive 0.1.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/runng_derive/0.1.0
[INFO] validating manifest of runng_derive-0.1.0 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of runng_derive-0.1.0 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing runng_derive-0.1.0
[INFO] finished frobbing runng_derive-0.1.0
[INFO] frobbed toml for runng_derive-0.1.0 written to work/ex/clippy-test-run/sources/stable/reg/runng_derive/0.1.0/Cargo.toml
[INFO] started frobbing runng_derive-0.1.0
[INFO] finished frobbing runng_derive-0.1.0
[INFO] frobbed toml for runng_derive-0.1.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/runng_derive/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting runng_derive-0.1.0 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-6/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/runng_derive/0.1.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 53a2904cd43d8b7b7ad77818ac861fb7663120a358408aceec502983ba48dfdf
[INFO] running `"docker" "start" "-a" "53a2904cd43d8b7b7ad77818ac861fb7663120a358408aceec502983ba48dfdf"`
[INFO] [stderr]     Checking syn v0.15.26
[INFO] [stderr]     Checking runng_derive v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let mut member: Option<syn::Ident> = get_nng_member(&ast);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/lib.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 | /             match data_struct.fields {
[INFO] [stderr] 29 | |                 // Structure with named fields (as opposed to tuple-like struct or unit struct)
[INFO] [stderr] 30 | |                 // E.g. struct Point { x: f64, y: f64 }
[INFO] [stderr] 31 | |                 syn::Fields::Named(ref fields_named) => {
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |                 _ => (),
[INFO] [stderr] 49 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 28 |             if let syn::Fields::Named(ref fields_named) = data_struct.fields {
[INFO] [stderr] 29 |     // Iterate over the fields: `x`, `y`, ..
[INFO] [stderr] 30 |     for field in fields_named.named.iter() {
[INFO] [stderr] 31 |         // Attributes `#[..]` on each field
[INFO] [stderr] 32 |         for attr in field.attrs.iter() {
[INFO] [stderr] 33 |             // Parse the attribute
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let mut member: Option<syn::Ident> = get_nng_member(&ast);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/lib.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 | /             match data_struct.fields {
[INFO] [stderr] 29 | |                 // Structure with named fields (as opposed to tuple-like struct or unit struct)
[INFO] [stderr] 30 | |                 // E.g. struct Point { x: f64, y: f64 }
[INFO] [stderr] 31 | |                 syn::Fields::Named(ref fields_named) => {
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |                 _ => (),
[INFO] [stderr] 49 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 28 |             if let syn::Fields::Named(ref fields_named) = data_struct.fields {
[INFO] [stderr] 29 |     // Iterate over the fields: `x`, `y`, ..
[INFO] [stderr] 30 |     for field in fields_named.named.iter() {
[INFO] [stderr] 31 |         // Attributes `#[..]` on each field
[INFO] [stderr] 32 |         for attr in field.attrs.iter() {
[INFO] [stderr] 33 |             // Parse the attribute
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.85s
[INFO] running `"docker" "inspect" "53a2904cd43d8b7b7ad77818ac861fb7663120a358408aceec502983ba48dfdf"`
[INFO] running `"docker" "rm" "-f" "53a2904cd43d8b7b7ad77818ac861fb7663120a358408aceec502983ba48dfdf"`
[INFO] [stdout] 53a2904cd43d8b7b7ad77818ac861fb7663120a358408aceec502983ba48dfdf