[INFO] fetching crate diesel_codegen_shared 0.10.0...
[INFO] testing diesel_codegen_shared-0.10.0 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate diesel_codegen_shared 0.10.0 into /workspace/builds/worker-95/source
[INFO] validating manifest of crates.io crate diesel_codegen_shared 0.10.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate diesel_codegen_shared 0.10.0
[INFO] finished tweaking crates.io crate diesel_codegen_shared 0.10.0
[INFO] tweaked toml for crates.io crate diesel_codegen_shared 0.10.0 written to /workspace/builds/worker-95/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 733e9993e53350e81c3f32de491ffe46d4e0c22b1916f4a92868e7c859c6603b
[INFO] running `Command { std: "docker" "start" "-a" "733e9993e53350e81c3f32de491ffe46d4e0c22b1916f4a92868e7c859c6603b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "733e9993e53350e81c3f32de491ffe46d4e0c22b1916f4a92868e7c859c6603b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "733e9993e53350e81c3f32de491ffe46d4e0c22b1916f4a92868e7c859c6603b", kill_on_drop: false }`
[INFO] [stdout] 733e9993e53350e81c3f32de491ffe46d4e0c22b1916f4a92868e7c859c6603b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd833e9e41410bd97f189345354f09ec14a93f7cbd2023a30f73022561911c2d
[INFO] running `Command { std: "docker" "start" "-a" "fd833e9e41410bd97f189345354f09ec14a93f7cbd2023a30f73022561911c2d", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling winapi v0.2.8
[INFO] [stderr]    Compiling utf8-ranges v0.1.3
[INFO] [stderr]    Compiling regex-syntax v0.3.9
[INFO] [stderr]    Compiling byteorder v0.3.13
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling diesel v0.10.1
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr]    Compiling regex v0.1.80
[INFO] [stderr]    Compiling dotenv v0.8.0
[INFO] [stderr]    Compiling diesel_codegen_shared v0.10.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]  --> src/database_url.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         try!(load_dotenv_file());
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/migrations.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 8 |     -> Result<PathBuf, Box<Error>>
[INFO] [stdout]   |                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/migrations.rs:10:32
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let cargo_toml_directory = try!(env::var("CARGO_MANIFEST_DIR"));
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/migrations.rs:19:26
[INFO] [stdout]    |
[INFO] [stdout] 19 | ) -> Result<PathBuf, Box<Error>> {
[INFO] [stdout]    |                          ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/migrations.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |             try!(search_for_migrations_directory(&src_dir))
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/database_url.rs:15:33
[INFO] [stdout]    |
[INFO] [stdout] 15 |                     var_name, e.description())
[INFO] [stdout]    |                                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.69s
[INFO] running `Command { std: "docker" "inspect" "fd833e9e41410bd97f189345354f09ec14a93f7cbd2023a30f73022561911c2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd833e9e41410bd97f189345354f09ec14a93f7cbd2023a30f73022561911c2d", kill_on_drop: false }`
[INFO] [stdout] fd833e9e41410bd97f189345354f09ec14a93f7cbd2023a30f73022561911c2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] faa1914d2516a46deaed104e5b800ec7ca9567be0586d1c8da054c7e41d29562
[INFO] running `Command { std: "docker" "start" "-a" "faa1914d2516a46deaed104e5b800ec7ca9567be0586d1c8da054c7e41d29562", kill_on_drop: false }`
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]  --> src/database_url.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         try!(load_dotenv_file());
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/migrations.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 8 |     -> Result<PathBuf, Box<Error>>
[INFO] [stdout]   |                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/migrations.rs:10:32
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let cargo_toml_directory = try!(env::var("CARGO_MANIFEST_DIR"));
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/migrations.rs:19:26
[INFO] [stdout]    |
[INFO] [stdout] 19 | ) -> Result<PathBuf, Box<Error>> {
[INFO] [stdout]    |                          ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/migrations.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |             try!(search_for_migrations_directory(&src_dir))
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/database_url.rs:15:33
[INFO] [stdout]    |
[INFO] [stdout] 15 |                     var_name, e.description())
[INFO] [stdout]    |                                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling diesel_codegen_shared v0.10.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]  --> src/database_url.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         try!(load_dotenv_file());
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/migrations.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 8 |     -> Result<PathBuf, Box<Error>>
[INFO] [stdout]   |                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/migrations.rs:10:32
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let cargo_toml_directory = try!(env::var("CARGO_MANIFEST_DIR"));
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/migrations.rs:19:26
[INFO] [stdout]    |
[INFO] [stdout] 19 | ) -> Result<PathBuf, Box<Error>> {
[INFO] [stdout]    |                          ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/migrations.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |             try!(search_for_migrations_directory(&src_dir))
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/database_url.rs:15:33
[INFO] [stdout]    |
[INFO] [stdout] 15 |                     var_name, e.description())
[INFO] [stdout]    |                                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.95s
[INFO] running `Command { std: "docker" "inspect" "faa1914d2516a46deaed104e5b800ec7ca9567be0586d1c8da054c7e41d29562", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "faa1914d2516a46deaed104e5b800ec7ca9567be0586d1c8da054c7e41d29562", kill_on_drop: false }`
[INFO] [stdout] faa1914d2516a46deaed104e5b800ec7ca9567be0586d1c8da054c7e41d29562
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 24f6135d6156f6043222a9627e8a0e825de1de29e316b0174b7c845af9465be2
[INFO] running `Command { std: "docker" "start" "-a" "24f6135d6156f6043222a9627e8a0e825de1de29e316b0174b7c845af9465be2", kill_on_drop: false }`
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stderr]  --> src/database_url.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |         try!(load_dotenv_file());
[INFO] [stderr]   |         ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/migrations.rs:8:28
[INFO] [stderr]   |
[INFO] [stderr] 8 |     -> Result<PathBuf, Box<Error>>
[INFO] [stderr]   |                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stderr]   --> src/migrations.rs:10:32
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let cargo_toml_directory = try!(env::var("CARGO_MANIFEST_DIR"));
[INFO] [stderr]    |                                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/migrations.rs:19:26
[INFO] [stderr]    |
[INFO] [stderr] 19 | ) -> Result<PathBuf, Box<Error>> {
[INFO] [stderr]    |                          ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stderr]   --> src/migrations.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |             try!(search_for_migrations_directory(&src_dir))
[INFO] [stderr]    |             ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stderr]   --> src/database_url.rs:15:33
[INFO] [stderr]    |
[INFO] [stderr] 15 |                     var_name, e.description())
[INFO] [stderr]    |                                 ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `diesel_codegen_shared` (lib) generated 7 warnings
[INFO] [stderr] warning: `diesel_codegen_shared` (lib test) generated 7 warnings (7 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.10s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/diesel_codegen_shared-269430e65459fee9)
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test database_url::extract_database_url_errors_if_env_var_is_unset ... ok
[INFO] [stdout] test database_url::extract_database_url_returns_the_given_string ... ok
[INFO] [stdout] test database_url::extract_database_url_returns_env_vars ... ok
[INFO] [stdout] test migrations::tests::migrations_directory_allows_no_parent_dir_for_cargo_manifest_dir ... ok
[INFO] [stdout] test migrations::tests::migrations_directory_resolved_relative_to_cargo_manifest_dir ... ok
[INFO] [stdout] test migrations::tests::migrations_directory_canonicalizes_result ... ok
[INFO] [stdout] test migrations::tests::migrations_directory_defaults_to_searching_migrations_path ... ok
[INFO] [stdout] test migrations::tests::migrations_directory_searches_src_migrations_if_present ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests diesel_codegen_shared
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "24f6135d6156f6043222a9627e8a0e825de1de29e316b0174b7c845af9465be2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24f6135d6156f6043222a9627e8a0e825de1de29e316b0174b7c845af9465be2", kill_on_drop: false }`
[INFO] [stdout] 24f6135d6156f6043222a9627e8a0e825de1de29e316b0174b7c845af9465be2
