[INFO] crate json-codec 0.5.0 is already in cache
[INFO] extracting crate json-codec 0.5.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/json-codec/0.5.0
[INFO] extracting crate json-codec 0.5.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/json-codec/0.5.0
[INFO] validating manifest of json-codec-0.5.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of json-codec-0.5.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing json-codec-0.5.0
[INFO] finished frobbing json-codec-0.5.0
[INFO] frobbed toml for json-codec-0.5.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/json-codec/0.5.0/Cargo.toml
[INFO] started frobbing json-codec-0.5.0
[INFO] finished frobbing json-codec-0.5.0
[INFO] frobbed toml for json-codec-0.5.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/json-codec/0.5.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing json-codec-0.5.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/json-codec/0.5.0:/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=warn" "-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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] f10e99258b22a8b9cb87b33278344d785a4c07c801351277adf24aa65a4132bc
[INFO] running `"docker" "start" "-a" "f10e99258b22a8b9cb87b33278344d785a4c07c801351277adf24aa65a4132bc"`
[INFO] [stderr]    Compiling json-codec v0.5.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `"docker" "inspect" "f10e99258b22a8b9cb87b33278344d785a4c07c801351277adf24aa65a4132bc"`
[INFO] running `"docker" "rm" "-f" "f10e99258b22a8b9cb87b33278344d785a4c07c801351277adf24aa65a4132bc"`
[INFO] [stdout] f10e99258b22a8b9cb87b33278344d785a4c07c801351277adf24aa65a4132bc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/json-codec/0.5.0:/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=warn" "-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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 82ba55d29c650e45d621e7f94c7405410bbc41fbdb2d3fa90bc32e5fe1492c8f
[INFO] running `"docker" "start" "-a" "82ba55d29c650e45d621e7f94c7405410bbc41fbdb2d3fa90bc32e5fe1492c8f"`
[INFO] [stderr]    Compiling json-codec v0.5.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0599]: no method named `gen_range` found for type `&mut G` in the current scope
[INFO] [stderr]    --> tests/properties.rs:132:13
[INFO] [stderr]     |
[INFO] [stderr] 132 |     match g.gen_range(1, 8) {
[INFO] [stderr]     |             ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is in scope
[INFO] [stderr] help: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]     |
[INFO] [stderr] 4   | use rand::Rng;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `gen` found for type `&mut G` in the current scope
[INFO] [stderr]    --> tests/properties.rs:135:29
[INFO] [stderr]     |
[INFO] [stderr] 135 |         3 => Json::Number(g.gen()),
[INFO] [stderr]     |                             ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is in scope
[INFO] [stderr] help: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]     |
[INFO] [stderr] 4   | use rand::Rng;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `gen_range` found for type `&mut G` in the current scope
[INFO] [stderr]    --> tests/properties.rs:154:21
[INFO] [stderr]     |
[INFO] [stderr] 154 |     let     len = g.gen_range(0, 64);
[INFO] [stderr]     |                     ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is in scope
[INFO] [stderr] help: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]     |
[INFO] [stderr] 4   | use rand::Rng;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `gen_range` found for type `&mut G` in the current scope
[INFO] [stderr]    --> tests/properties.rs:163:21
[INFO] [stderr]     |
[INFO] [stderr] 163 |     let     len = g.gen_range(0, 64);
[INFO] [stderr]     |                     ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is in scope
[INFO] [stderr] help: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]     |
[INFO] [stderr] 4   | use rand::Rng;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: Could not compile `json-codec`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "82ba55d29c650e45d621e7f94c7405410bbc41fbdb2d3fa90bc32e5fe1492c8f"`
[INFO] running `"docker" "rm" "-f" "82ba55d29c650e45d621e7f94c7405410bbc41fbdb2d3fa90bc32e5fe1492c8f"`
[INFO] [stdout] 82ba55d29c650e45d621e7f94c7405410bbc41fbdb2d3fa90bc32e5fe1492c8f