[INFO] cloning repository https://github.com/daic0r/json_lib2
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/daic0r/json_lib2" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaic0r%2Fjson_lib2", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaic0r%2Fjson_lib2'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2b239206fb8bc72b9427a22ed80c0f22f3ab0b16
[INFO] building daic0r/json_lib2 against master#44f415c1d617ebc7b931a243b7b321ef8a6ca47c for pr-142134-abi-ast-error
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaic0r%2Fjson_lib2" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/daic0r/json_lib2 on toolchain 44f415c1d617ebc7b931a243b7b321ef8a6ca47c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/daic0r/json_lib2
[INFO] finished tweaking git repo https://github.com/daic0r/json_lib2
[INFO] tweaked toml for git repo https://github.com/daic0r/json_lib2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/daic0r/json_lib2 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" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6bb719979fe393f98710597753a26b392928d20389fae91acf2dee2fe66d3483
[INFO] running `Command { std: "docker" "start" "-a" "6bb719979fe393f98710597753a26b392928d20389fae91acf2dee2fe66d3483", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6bb719979fe393f98710597753a26b392928d20389fae91acf2dee2fe66d3483", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6bb719979fe393f98710597753a26b392928d20389fae91acf2dee2fe66d3483", kill_on_drop: false }`
[INFO] [stdout] 6bb719979fe393f98710597753a26b392928d20389fae91acf2dee2fe66d3483
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 17d6873c823d6cad2482e8989a7de5d1c8c4c23d15187547982cd08e3ffa5138
[INFO] running `Command { std: "docker" "start" "-a" "17d6873c823d6cad2482e8989a7de5d1c8c4c23d15187547982cd08e3ffa5138", kill_on_drop: false }`
[INFO] [stderr]    Compiling json_lib2 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/lib.rs:2:37
[INFO] [stdout]   |
[INFO] [stdout] 2 |     use std::collections::{HashMap, HashSet, VecDeque};
[INFO] [stdout]   |                                     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/lib.rs:141:40
[INFO] [stdout]     |
[INFO] [stdout] 141 | ...                   if let Err(n) = num {
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `col` and `row` are never read
[INFO] [stdout]   --> src/lib.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub struct SourceLocation {
[INFO] [stdout]    |                -------------- fields in this struct
[INFO] [stdout] 31 |         col: usize,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 32 |         row: usize,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SourceLocation` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `from` and `to` are never read
[INFO] [stdout]   --> src/lib.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub struct LexicalToken {
[INFO] [stdout]    |                ------------ fields in this struct
[INFO] [stdout] 37 |         token: Token,
[INFO] [stdout] 38 |         from: SourceLocation,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 39 |         to: SourceLocation,
[INFO] [stdout]    |         ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `LexicalToken` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "17d6873c823d6cad2482e8989a7de5d1c8c4c23d15187547982cd08e3ffa5138", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17d6873c823d6cad2482e8989a7de5d1c8c4c23d15187547982cd08e3ffa5138", kill_on_drop: false }`
[INFO] [stdout] 17d6873c823d6cad2482e8989a7de5d1c8c4c23d15187547982cd08e3ffa5138
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6ad6e1ec9642ee318b44202590106060831d9be2b2d4955b49ac6c9e750769ca
[INFO] running `Command { std: "docker" "start" "-a" "6ad6e1ec9642ee318b44202590106060831d9be2b2d4955b49ac6c9e750769ca", kill_on_drop: false }`
[INFO] [stderr]    Compiling json_lib2 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/lib.rs:2:37
[INFO] [stdout]   |
[INFO] [stdout] 2 |     use std::collections::{HashMap, HashSet, VecDeque};
[INFO] [stdout]   |                                     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/lib.rs:141:40
[INFO] [stdout]     |
[INFO] [stdout] 141 | ...                   if let Err(n) = num {
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `col` and `row` are never read
[INFO] [stdout]   --> src/lib.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub struct SourceLocation {
[INFO] [stdout]    |                -------------- fields in this struct
[INFO] [stdout] 31 |         col: usize,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 32 |         row: usize,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SourceLocation` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `from` and `to` are never read
[INFO] [stdout]   --> src/lib.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub struct LexicalToken {
[INFO] [stdout]    |                ------------ fields in this struct
[INFO] [stdout] 37 |         token: Token,
[INFO] [stdout] 38 |         from: SourceLocation,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 39 |         to: SourceLocation,
[INFO] [stdout]    |         ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `LexicalToken` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/lib.rs:2:37
[INFO] [stdout]   |
[INFO] [stdout] 2 |     use std::collections::{HashMap, HashSet, VecDeque};
[INFO] [stdout]   |                                     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]    --> src/lib.rs:141:40
[INFO] [stdout]     |
[INFO] [stdout] 141 | ...                   if let Err(n) = num {
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `col` and `row` are never read
[INFO] [stdout]   --> src/lib.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub struct SourceLocation {
[INFO] [stdout]    |                -------------- fields in this struct
[INFO] [stdout] 31 |         col: usize,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 32 |         row: usize,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SourceLocation` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `from` and `to` are never read
[INFO] [stdout]   --> src/lib.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub struct LexicalToken {
[INFO] [stdout]    |                ------------ fields in this struct
[INFO] [stdout] 37 |         token: Token,
[INFO] [stdout] 38 |         from: SourceLocation,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 39 |         to: SourceLocation,
[INFO] [stdout]    |         ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `LexicalToken` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "6ad6e1ec9642ee318b44202590106060831d9be2b2d4955b49ac6c9e750769ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ad6e1ec9642ee318b44202590106060831d9be2b2d4955b49ac6c9e750769ca", kill_on_drop: false }`
[INFO] [stdout] 6ad6e1ec9642ee318b44202590106060831d9be2b2d4955b49ac6c9e750769ca