[INFO] fetching crate bittwiddler 0.0.2...
[INFO] checking bittwiddler-0.0.2 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1
[INFO] extracting crate bittwiddler 0.0.2 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate bittwiddler 0.0.2
[INFO] finished tweaking crates.io crate bittwiddler 0.0.2
[INFO] tweaked toml for crates.io crate bittwiddler 0.0.2 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate bittwiddler 0.0.2 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[INFO] [stderr]       Adding quote v0.5.2 (available: v1.0.40)
[INFO] [stderr]       Adding syn v0.13.11 (available: v2.0.106)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro2 v0.3.8
[INFO] [stderr]   Downloaded syn v0.13.11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6122e6ff3758d0db68f695a3315b4d5d14f22f09090d8e1eb1d723705f19d98f
[INFO] running `Command { std: "docker" "start" "-a" "6122e6ff3758d0db68f695a3315b4d5d14f22f09090d8e1eb1d723705f19d98f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6122e6ff3758d0db68f695a3315b4d5d14f22f09090d8e1eb1d723705f19d98f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6122e6ff3758d0db68f695a3315b4d5d14f22f09090d8e1eb1d723705f19d98f", kill_on_drop: false }`
[INFO] [stdout] 6122e6ff3758d0db68f695a3315b4d5d14f22f09090d8e1eb1d723705f19d98f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6d64d94193bec413c769c445b202657b9ec04cb5a1019acdf279ea5f1860133c
[INFO] running `Command { std: "docker" "start" "-a" "6d64d94193bec413c769c445b202657b9ec04cb5a1019acdf279ea5f1860133c", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-xid v0.1.0
[INFO] [stderr]     Checking proc-macro2 v0.3.8
[INFO] [stderr]     Checking quote v0.5.2
[INFO] [stderr]     Checking syn v0.13.11
[INFO] [stderr]     Checking bittwiddler v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/lib.rs:129:13
[INFO] [stdout]     |
[INFO] [stdout] 129 | /             quote! {
[INFO] [stdout] 130 | |                 impl #input_ident {
[INFO] [stdout] 131 | |                     pub fn decode(x: (#(#bools2),*)) -> Self {
[INFO] [stdout] 132 | |                         match x {
[INFO] [stdout] ...   |
[INFO] [stdout] 138 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/quote-0.5.2/src/lib.rs:381:29
[INFO] [stdout]     |
[INFO] [stdout] 381 ~         nested_tuples_pat!((while let Some(for pounded_var_names!(nested_tuples_pat () $($inner)*)
[INFO] [stdout] 382 ~         nested_tuples_pat!(() = ) $($rest)*)
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/quote-0.5.2/src/lib.rs:381:29
[INFO] [stdout]     |
[INFO] [stdout] 381 ~         nested_tuples_pat!((if let Some(for pounded_var_names!(nested_tuples_pat () $($inner)*)
[INFO] [stdout] 382 ~         nested_tuples_pat!(() = ) $($rest)*)
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/lib.rs:141:13
[INFO] [stdout]     |
[INFO] [stdout] 141 | /             quote! {
[INFO] [stdout] 142 | |                 impl #input_ident {
[INFO] [stdout] 143 | |                     pub fn decode(x: (#(#bools2),*)) -> Result<Self, #bits_errtype> {
[INFO] [stdout] 144 | |                         Ok(match x {
[INFO] [stdout] ...   |
[INFO] [stdout] 150 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/quote-0.5.2/src/lib.rs:381:29
[INFO] [stdout]     |
[INFO] [stdout] 381 ~         nested_tuples_pat!((while let Some(for pounded_var_names!(nested_tuples_pat () $($inner)*)
[INFO] [stdout] 382 ~         nested_tuples_pat!(() = ) $($rest)*)
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/quote-0.5.2/src/lib.rs:381:29
[INFO] [stdout]     |
[INFO] [stdout] 381 ~         nested_tuples_pat!((if let Some(for pounded_var_names!(nested_tuples_pat () $($inner)*)
[INFO] [stdout] 382 ~         nested_tuples_pat!(() = ) $($rest)*)
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/lib.rs:129:13
[INFO] [stdout]     |
[INFO] [stdout] 129 | /             quote! {
[INFO] [stdout] 130 | |                 impl #input_ident {
[INFO] [stdout] 131 | |                     pub fn decode(x: (#(#bools2),*)) -> Self {
[INFO] [stdout] 132 | |                         match x {
[INFO] [stdout] ...   |
[INFO] [stdout] 138 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/quote-0.5.2/src/lib.rs:381:29
[INFO] [stdout]     |
[INFO] [stdout] 381 ~         nested_tuples_pat!((while let Some(for pounded_var_names!(nested_tuples_pat () $($inner)*)
[INFO] [stdout] 382 ~         nested_tuples_pat!(() = ) $($rest)*)
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/quote-0.5.2/src/lib.rs:381:29
[INFO] [stdout]     |
[INFO] [stdout] 381 ~         nested_tuples_pat!((if let Some(for pounded_var_names!(nested_tuples_pat () $($inner)*)
[INFO] [stdout] 382 ~         nested_tuples_pat!(() = ) $($rest)*)
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/lib.rs:141:13
[INFO] [stdout]     |
[INFO] [stdout] 141 | /             quote! {
[INFO] [stdout] 142 | |                 impl #input_ident {
[INFO] [stdout] 143 | |                     pub fn decode(x: (#(#bools2),*)) -> Result<Self, #bits_errtype> {
[INFO] [stdout] 144 | |                         Ok(match x {
[INFO] [stdout] ...   |
[INFO] [stdout] 150 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/quote-0.5.2/src/lib.rs:381:29
[INFO] [stdout]     |
[INFO] [stdout] 381 ~         nested_tuples_pat!((while let Some(for pounded_var_names!(nested_tuples_pat () $($inner)*)
[INFO] [stdout] 382 ~         nested_tuples_pat!(() = ) $($rest)*)
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/quote-0.5.2/src/lib.rs:381:29
[INFO] [stdout]     |
[INFO] [stdout] 381 ~         nested_tuples_pat!((if let Some(for pounded_var_names!(nested_tuples_pat () $($inner)*)
[INFO] [stdout] 382 ~         nested_tuples_pat!(() = ) $($rest)*)
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.74s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: syn v0.13.11
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "6d64d94193bec413c769c445b202657b9ec04cb5a1019acdf279ea5f1860133c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d64d94193bec413c769c445b202657b9ec04cb5a1019acdf279ea5f1860133c", kill_on_drop: false }`
[INFO] [stdout] 6d64d94193bec413c769c445b202657b9ec04cb5a1019acdf279ea5f1860133c