[INFO] cloning repository https://github.com/brson/piddle
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/brson/piddle" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrson%2Fpiddle", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrson%2Fpiddle'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 740fc3718248a4cfc59df356c26209eb5f321494
[INFO] checking brson/piddle against master#642c19bfc3a5c1de985bf5d0cc8207ac9d22708a for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrson%2Fpiddle" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/brson/piddle
[INFO] finished tweaking git repo https://github.com/brson/piddle
[INFO] tweaked toml for git repo https://github.com/brson/piddle written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/brson/piddle on toolchain 642c19bfc3a5c1de985bf5d0cc8207ac9d22708a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/brson/piddle already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 31120133e4c6140e7d8ae4f399e70a835dfd4494168063d4c0ed0291db598bc2
[INFO] running `Command { std: "docker" "start" "-a" "31120133e4c6140e7d8ae4f399e70a835dfd4494168063d4c0ed0291db598bc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "31120133e4c6140e7d8ae4f399e70a835dfd4494168063d4c0ed0291db598bc2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31120133e4c6140e7d8ae4f399e70a835dfd4494168063d4c0ed0291db598bc2", kill_on_drop: false }`
[INFO] [stdout] 31120133e4c6140e7d8ae4f399e70a835dfd4494168063d4c0ed0291db598bc2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+642c19bfc3a5c1de985bf5d0cc8207ac9d22708a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b197c75ee524fd8ed1504093b714249dc7309dea7ca28ce5bd64ea76dc84321
[INFO] running `Command { std: "docker" "start" "-a" "0b197c75ee524fd8ed1504093b714249dc7309dea7ca28ce5bd64ea76dc84321", kill_on_drop: false }`
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]    Compiling minimal-lexical v0.1.2
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling anyhow v1.0.43
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking endian-type v0.1.2
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking utf8parse v0.2.0
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling ahash v0.7.4
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling nom v7.0.0
[INFO] [stderr]     Checking nibble_vec v0.1.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking radix_trie v0.2.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking dirs-sys-next v0.1.2
[INFO] [stderr]     Checking fd-lock v3.0.0
[INFO] [stderr]     Checking nix v0.22.1
[INFO] [stderr]     Checking dirs-next v2.0.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking hecs v0.6.4
[INFO] [stderr]     Checking rustyline v9.0.0
[INFO] [stderr]     Checking string-interner v0.13.0
[INFO] [stderr]    Compiling structopt-derive v0.4.15
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]     Checking thiserror v1.0.26
[INFO] [stderr]     Checking structopt v0.3.22
[INFO] [stderr]     Checking piddle v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:140:17
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 drop(from_module_ctxt);
[INFO] [stdout]     |                 ^^^^^----------------^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 140 -                 drop(from_module_ctxt);
[INFO] [stdout] 140 +                 let _ = from_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:166:5
[INFO] [stdout]     |
[INFO] [stdout] 166 |     drop(from_module_ctxt);
[INFO] [stdout]     |     ^^^^^----------------^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 166 -     drop(from_module_ctxt);
[INFO] [stdout] 166 +     let _ = from_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |                 drop(from_module_ctxt);
[INFO] [stdout]     |                 ^^^^^----------------^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 173 -                 drop(from_module_ctxt);
[INFO] [stdout] 173 +                 let _ = from_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:202:9
[INFO] [stdout]     |
[INFO] [stdout] 202 |         drop(module_ctxt);
[INFO] [stdout]     |         ^^^^^-----------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 202 -         drop(module_ctxt);
[INFO] [stdout] 202 +         let _ = module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:224:9
[INFO] [stdout]     |
[INFO] [stdout] 224 |         drop(module_ctxt);
[INFO] [stdout]     |         ^^^^^-----------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 224 -         drop(module_ctxt);
[INFO] [stdout] 224 +         let _ = module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:231:13
[INFO] [stdout]     |
[INFO] [stdout] 231 |             drop(other_module_ctxt);
[INFO] [stdout]     |             ^^^^^-----------------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 231 -             drop(other_module_ctxt);
[INFO] [stdout] 231 +             let _ = other_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:246:9
[INFO] [stdout]     |
[INFO] [stdout] 246 |         drop(other_module_ctxt);
[INFO] [stdout]     |         ^^^^^-----------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 246 -         drop(other_module_ctxt);
[INFO] [stdout] 246 +         let _ = other_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:261:9
[INFO] [stdout]     |
[INFO] [stdout] 261 |         drop(other_module_ctxt);
[INFO] [stdout]     |         ^^^^^-----------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 261 -         drop(other_module_ctxt);
[INFO] [stdout] 261 +         let _ = other_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:140:17
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 drop(from_module_ctxt);
[INFO] [stdout]     |                 ^^^^^----------------^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 140 -                 drop(from_module_ctxt);
[INFO] [stdout] 140 +                 let _ = from_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:166:5
[INFO] [stdout]     |
[INFO] [stdout] 166 |     drop(from_module_ctxt);
[INFO] [stdout]     |     ^^^^^----------------^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 166 -     drop(from_module_ctxt);
[INFO] [stdout] 166 +     let _ = from_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |                 drop(from_module_ctxt);
[INFO] [stdout]     |                 ^^^^^----------------^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 173 -                 drop(from_module_ctxt);
[INFO] [stdout] 173 +                 let _ = from_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:202:9
[INFO] [stdout]     |
[INFO] [stdout] 202 |         drop(module_ctxt);
[INFO] [stdout]     |         ^^^^^-----------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 202 -         drop(module_ctxt);
[INFO] [stdout] 202 +         let _ = module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:224:9
[INFO] [stdout]     |
[INFO] [stdout] 224 |         drop(module_ctxt);
[INFO] [stdout]     |         ^^^^^-----------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 224 -         drop(module_ctxt);
[INFO] [stdout] 224 +         let _ = module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:231:13
[INFO] [stdout]     |
[INFO] [stdout] 231 |             drop(other_module_ctxt);
[INFO] [stdout]     |             ^^^^^-----------------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 231 -             drop(other_module_ctxt);
[INFO] [stdout] 231 +             let _ = other_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:246:9
[INFO] [stdout]     |
[INFO] [stdout] 246 |         drop(other_module_ctxt);
[INFO] [stdout]     |         ^^^^^-----------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 246 -         drop(other_module_ctxt);
[INFO] [stdout] 246 +         let _ = other_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/compiler.rs:261:9
[INFO] [stdout]     |
[INFO] [stdout] 261 |         drop(other_module_ctxt);
[INFO] [stdout]     |         ^^^^^-----------------^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut ModuleContext`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 261 -         drop(other_module_ctxt);
[INFO] [stdout] 261 +         let _ = other_module_ctxt;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.43s
[INFO] running `Command { std: "docker" "inspect" "0b197c75ee524fd8ed1504093b714249dc7309dea7ca28ce5bd64ea76dc84321", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b197c75ee524fd8ed1504093b714249dc7309dea7ca28ce5bd64ea76dc84321", kill_on_drop: false }`
[INFO] [stdout] 0b197c75ee524fd8ed1504093b714249dc7309dea7ca28ce5bd64ea76dc84321
