[INFO] updating cached repository Miniwoffer/mdbook-dot
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Miniwoffer/mdbook-dot
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Miniwoffer/mdbook-dot" "work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/Miniwoffer/mdbook-dot"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/Miniwoffer/mdbook-dot'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Miniwoffer/mdbook-dot" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/Miniwoffer/mdbook-dot"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/Miniwoffer/mdbook-dot'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5e7cf6e29993aa699ffcf60659acd6f62009f561
[INFO] sha for GitHub repo Miniwoffer/mdbook-dot: 5e7cf6e29993aa699ffcf60659acd6f62009f561
[INFO] validating manifest of Miniwoffer/mdbook-dot on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Miniwoffer/mdbook-dot on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Miniwoffer/mdbook-dot
[INFO] finished frobbing Miniwoffer/mdbook-dot
[INFO] frobbed toml for Miniwoffer/mdbook-dot written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/Miniwoffer/mdbook-dot/Cargo.toml
[INFO] started frobbing Miniwoffer/mdbook-dot
[INFO] finished frobbing Miniwoffer/mdbook-dot
[INFO] frobbed toml for Miniwoffer/mdbook-dot written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/Miniwoffer/mdbook-dot/Cargo.toml
[INFO] crate Miniwoffer/mdbook-dot already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking Miniwoffer/mdbook-dot against try#99a7498759a22b5684caf798a98b7e90ad9d2443 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-2/try#99a7498759a22b5684caf798a98b7e90ad9d2443:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/Miniwoffer/mdbook-dot:/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" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c6f466eceb8fef64801dc8c74401f29680dedff3ff483ac8e5090b83a4a4baa4
[INFO] running `"docker" "start" "-a" "c6f466eceb8fef64801dc8c74401f29680dedff3ff483ac8e5090b83a4a4baa4"`
[INFO] [stderr]    Compiling syn v0.15.18
[INFO] [stderr]     Checking ws v0.7.9
[INFO] [stderr]    Compiling strum_macros v0.9.1
[INFO] [stderr]    Compiling string_cache_codegen v0.4.2
[INFO] [stderr]     Checking regex v1.0.6
[INFO] [stderr]     Checking iron v0.6.0
[INFO] [stderr]     Checking mount v0.4.0
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]     Checking staticfile v0.5.0
[INFO] [stderr]     Checking toml-query v0.7.0
[INFO] [stderr]     Checking handlebars v1.1.0
[INFO] [stderr]     Checking env_logger v0.5.13
[INFO] [stderr]    Compiling serde_derive v1.0.80
[INFO] [stderr]    Compiling html5ever v0.22.5
[INFO] [stderr]    Compiling markup5ever v0.7.3
[INFO] [stderr]     Checking elasticlunr-rs v2.3.3
[INFO] [stderr]     Checking ammonia v1.2.0
[INFO] [stderr]     Checking mdbook v0.2.3
[INFO] [stderr]     Checking mdbook-dot v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `ArgMatches`
[INFO] [stderr]  --> src/bin/mdbook-dot.rs:6:22
[INFO] [stderr]   |
[INFO] [stderr] 6 | use clap::{App, Arg, ArgMatches, SubCommand};
[INFO] [stderr]   |                      ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::fs;
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Chapter`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:14:34
[INFO] [stderr]    |
[INFO] [stderr] 14 | use mdbook::book::{Book,BookItem,Chapter};
[INFO] [stderr]    |                                  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ArgMatches`
[INFO] [stderr]  --> src/bin/mdbook-dot.rs:6:22
[INFO] [stderr]   |
[INFO] [stderr] 6 | use clap::{App, Arg, ArgMatches, SubCommand};
[INFO] [stderr]   |                      ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::fs;
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Chapter`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:14:34
[INFO] [stderr]    |
[INFO] [stderr] 14 | use mdbook::book::{Book,BookItem,Chapter};
[INFO] [stderr]    |                                  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_args`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:34:17
[INFO] [stderr]    |
[INFO] [stderr] 34 |     if let Some(sub_args) = matches.subcommand_matches("supports") {
[INFO] [stderr]    |                 ^^^^^^^^ help: consider prefixing with an underscore: `_sub_args`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `front`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:81:34
[INFO] [stderr]    |
[INFO] [stderr] 81 |                             let (front,back) = chapter.content.split_at(start);
[INFO] [stderr]    |                                  ^^^^^ help: consider prefixing with an underscore: `_front`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_replaced_items`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:68:29
[INFO] [stderr]    |
[INFO] [stderr] 68 | fn process <'a,I>(items: I, num_replaced_items: &mut usize) -> Result<()>
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_num_replaced_items`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path`
[INFO] [stderr]    --> src/bin/mdbook-dot.rs:112:32
[INFO] [stderr]     |
[INFO] [stderr] 112 | fn dot_to_image(input : String,path : String) -> Result<String> {
[INFO] [stderr]     |                                ^^^^ help: consider prefixing with an underscore: `_path`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `renderer`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:64:33
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn supports_renderer(&self, renderer: &str) -> bool {
[INFO] [stderr]    |                                 ^^^^^^^^ help: consider prefixing with an underscore: `_renderer`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/bin/mdbook-dot.rs:118:13
[INFO] [stderr]     |
[INFO] [stderr] 118 |         let mut stdin = dot.stdin.as_mut().expect("Failed to open stdin");
[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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     serde_json::to_writer(io::stdout(), &processed_book);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 61 |         process(&mut book.sections, &mut num_replaced_items);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sub_args`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:34:17
[INFO] [stderr]    |
[INFO] [stderr] 34 |     if let Some(sub_args) = matches.subcommand_matches("supports") {
[INFO] [stderr]    |                 ^^^^^^^^ help: consider prefixing with an underscore: `_sub_args`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `front`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:81:34
[INFO] [stderr]    |
[INFO] [stderr] 81 |                             let (front,back) = chapter.content.split_at(start);
[INFO] [stderr]    |                                  ^^^^^ help: consider prefixing with an underscore: `_front`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_replaced_items`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:68:29
[INFO] [stderr]    |
[INFO] [stderr] 68 | fn process <'a,I>(items: I, num_replaced_items: &mut usize) -> Result<()>
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_num_replaced_items`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path`
[INFO] [stderr]    --> src/bin/mdbook-dot.rs:112:32
[INFO] [stderr]     |
[INFO] [stderr] 112 | fn dot_to_image(input : String,path : String) -> Result<String> {
[INFO] [stderr]     |                                ^^^^ help: consider prefixing with an underscore: `_path`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `renderer`
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:64:33
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn supports_renderer(&self, renderer: &str) -> bool {
[INFO] [stderr]    |                                 ^^^^^^^^ help: consider prefixing with an underscore: `_renderer`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/bin/mdbook-dot.rs:118:13
[INFO] [stderr]     |
[INFO] [stderr] 118 |         let mut stdin = dot.stdin.as_mut().expect("Failed to open stdin");
[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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     serde_json::to_writer(io::stdout(), &processed_book);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/mdbook-dot.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 61 |         process(&mut book.sections, &mut num_replaced_items);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 57.52s
[INFO] running `"docker" "inspect" "c6f466eceb8fef64801dc8c74401f29680dedff3ff483ac8e5090b83a4a4baa4"`
[INFO] running `"docker" "rm" "-f" "c6f466eceb8fef64801dc8c74401f29680dedff3ff483ac8e5090b83a4a4baa4"`
[INFO] [stdout] c6f466eceb8fef64801dc8c74401f29680dedff3ff483ac8e5090b83a4a4baa4