[INFO] updating cached repository panzi/rust-json-builder
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/panzi/rust-json-builder
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/panzi/rust-json-builder" "work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/panzi/rust-json-builder"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/panzi/rust-json-builder'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/panzi/rust-json-builder" "work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/panzi/rust-json-builder"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/panzi/rust-json-builder'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 55a32321d40ad0f6ff02f1fba733afca27c31991
[INFO] sha for GitHub repo panzi/rust-json-builder: 55a32321d40ad0f6ff02f1fba733afca27c31991
[INFO] validating manifest of panzi/rust-json-builder on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of panzi/rust-json-builder on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing panzi/rust-json-builder
[INFO] finished frobbing panzi/rust-json-builder
[INFO] frobbed toml for panzi/rust-json-builder written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/panzi/rust-json-builder/Cargo.toml
[INFO] started frobbing panzi/rust-json-builder
[INFO] finished frobbing panzi/rust-json-builder
[INFO] frobbed toml for panzi/rust-json-builder written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/panzi/rust-json-builder/Cargo.toml
[INFO] crate panzi/rust-json-builder already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking panzi/rust-json-builder against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-7/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/panzi/rust-json-builder:/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" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 057158e8b5eed8ea033ce879290961b6f4edcde8f1d9a917c8fc03e5eaa31d5d
[INFO] running `"docker" "start" "-a" "057158e8b5eed8ea033ce879290961b6f4edcde8f1d9a917c8fc03e5eaa31d5d"`
[INFO] [stderr]     Checking json_builder v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/json_builder.rs:26:18
[INFO] [stderr]    |
[INFO] [stderr] 26 |     writer: &'a mut Write,
[INFO] [stderr]    |                     ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/json_builder.rs:66:42
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn escape_json(s: &str, writer: &mut Write) -> std::io::Result<()> {
[INFO] [stderr]    |                                          ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/json_builder.rs:135:26
[INFO] [stderr]     |
[INFO] [stderr] 135 |     pub fn new(writer: &mut Write) -> JSONBuilder {
[INFO] [stderr]     |                             ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/json_builder.rs:144:33
[INFO] [stderr]     |
[INFO] [stderr] 144 |     pub fn new_pretty(writer: &mut Write, indent_size: usize, tab_indent: bool) -> JSONBuilder {
[INFO] [stderr]     |                                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/json_builder.rs:365:27
[INFO] [stderr]     |
[INFO] [stderr] 365 | impl<'a> IntoJSON for &'a IntoJSON {
[INFO] [stderr]     |                           ^^^^^^^^ help: use `dyn`: `dyn IntoJSON`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/json_builder.rs:26:18
[INFO] [stderr]    |
[INFO] [stderr] 26 |     writer: &'a mut Write,
[INFO] [stderr]    |                     ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/json_builder.rs:66:42
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn escape_json(s: &str, writer: &mut Write) -> std::io::Result<()> {
[INFO] [stderr]    |                                          ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/json_builder.rs:135:26
[INFO] [stderr]     |
[INFO] [stderr] 135 |     pub fn new(writer: &mut Write) -> JSONBuilder {
[INFO] [stderr]     |                             ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/json_builder.rs:144:33
[INFO] [stderr]     |
[INFO] [stderr] 144 |     pub fn new_pretty(writer: &mut Write, indent_size: usize, tab_indent: bool) -> JSONBuilder {
[INFO] [stderr]     |                                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/json_builder.rs:365:27
[INFO] [stderr]     |
[INFO] [stderr] 365 | impl<'a> IntoJSON for &'a IntoJSON {
[INFO] [stderr]     |                           ^^^^^^^^ help: use `dyn`: `dyn IntoJSON`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `"docker" "inspect" "057158e8b5eed8ea033ce879290961b6f4edcde8f1d9a917c8fc03e5eaa31d5d"`
[INFO] running `"docker" "rm" "-f" "057158e8b5eed8ea033ce879290961b6f4edcde8f1d9a917c8fc03e5eaa31d5d"`
[INFO] [stdout] 057158e8b5eed8ea033ce879290961b6f4edcde8f1d9a917c8fc03e5eaa31d5d