[INFO] cloning repository https://github.com/irvingwashington/object_space_navigator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/irvingwashington/object_space_navigator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Firvingwashington%2Fobject_space_navigator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Firvingwashington%2Fobject_space_navigator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d549c75537f09b50a6a85571daf7b04dabc114dd
[INFO] checking irvingwashington/object_space_navigator against master#5518eaa946291f00471af8b254b2a1715f234882 for pr-120393
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Firvingwashington%2Fobject_space_navigator" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/irvingwashington/object_space_navigator on toolchain 5518eaa946291f00471af8b254b2a1715f234882
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/irvingwashington/object_space_navigator
[INFO] finished tweaking git repo https://github.com/irvingwashington/object_space_navigator
[INFO] tweaked toml for git repo https://github.com/irvingwashington/object_space_navigator written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/irvingwashington/object_space_navigator 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" "+5518eaa946291f00471af8b254b2a1715f234882" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_json v1.0.33
[INFO] [stderr]   Downloaded serde_derive v1.0.82
[INFO] [stderr]   Downloaded serde v1.0.82
[INFO] [stderr]   Downloaded syn v0.15.23
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b1553c5de35917e25c97492582f42864f734ef74cb5c48c5e818852a20aedaba
[INFO] running `Command { std: "docker" "start" "-a" "b1553c5de35917e25c97492582f42864f734ef74cb5c48c5e818852a20aedaba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b1553c5de35917e25c97492582f42864f734ef74cb5c48c5e818852a20aedaba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1553c5de35917e25c97492582f42864f734ef74cb5c48c5e818852a20aedaba", kill_on_drop: false }`
[INFO] [stdout] b1553c5de35917e25c97492582f42864f734ef74cb5c48c5e818852a20aedaba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d854e970f7822e8013631377654fc911723de50b4ada54d8aff66c50f3a52ae8
[INFO] running `Command { std: "docker" "start" "-a" "d854e970f7822e8013631377654fc911723de50b4ada54d8aff66c50f3a52ae8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling serde v1.0.82
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]     Checking itoa v0.4.3
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]    Compiling serde_derive v1.0.82
[INFO] [stderr]     Checking serde_json v1.0.33
[INFO] [stderr]     Checking object_space_navigator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/heap_dump.rs:11:18
[INFO] [stdout]    |
[INFO] [stdout] 11 |     StringObject(StringObject),
[INFO] [stdout]    |     ------------ ^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 11 |     StringObject(()),
[INFO] [stdout]    |                  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/heap_dump.rs:12:17
[INFO] [stdout]    |
[INFO] [stdout] 12 |     ArrayObject(ArrayObject),
[INFO] [stdout]    |     ----------- ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 12 |     ArrayObject(()),
[INFO] [stdout]    |                 ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/heap_dump.rs:13:16
[INFO] [stdout]    |
[INFO] [stdout] 13 |     HeapObject(HeapObject),
[INFO] [stdout]    |     ---------- ^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 13 |     HeapObject(()),
[INFO] [stdout]    |                ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `RootObject` is never constructed
[INFO] [stdout]   --> src/heap_dump.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum AnyHeapObject {
[INFO] [stdout]    |      ------------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 14 |     RootObject(RootObject)
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `AnyHeapObject` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_value` is never used
[INFO] [stdout]   --> src/heap_dump.rs:90:8
[INFO] [stdout]    |
[INFO] [stdout] 85 | impl RootObject {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 90 |     fn from_value(value: Value) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_root.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl NodeRoot {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 13 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_array.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl NodeArray {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 27 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_string.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | impl NodeString {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 31 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_imemo.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl NodeImemo {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 25 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_object.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl NodeObject {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 25 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_regexp.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl NodeRegexp {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 24 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_class.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl NodeClass {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 25 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_module.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl NodeModule {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 25 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_hash.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl NodeHash {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 27 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_data.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl NodeData {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 27 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_iclass.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl NodeIclass {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 25 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_symbol.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl NodeSymbol {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 25 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_complex.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl NodeComplex {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 22 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_bignum.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl NodeBignum {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 22 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_file.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl NodeFile {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 25 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_float.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl NodeFloat {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 23 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_rational.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl NodeRational {
[INFO] [stdout]    | ----------------- associated function in this implementation
[INFO] [stdout] 22 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_struct.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl NodeStruct {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 24 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_str` is never used
[INFO] [stdout]   --> src/object_space_2_6_0/node_match.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl NodeMatch {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 24 |     fn from_str(json_form: &str) -> Result<Self, Error> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/heap_dump.rs:11:18
[INFO] [stdout]    |
[INFO] [stdout] 11 |     StringObject(StringObject),
[INFO] [stdout]    |     ------------ ^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 11 |     StringObject(()),
[INFO] [stdout]    |                  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/heap_dump.rs:12:17
[INFO] [stdout]    |
[INFO] [stdout] 12 |     ArrayObject(ArrayObject),
[INFO] [stdout]    |     ----------- ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 12 |     ArrayObject(()),
[INFO] [stdout]    |                 ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/heap_dump.rs:13:16
[INFO] [stdout]    |
[INFO] [stdout] 13 |     HeapObject(HeapObject),
[INFO] [stdout]    |     ---------- ^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 13 |     HeapObject(()),
[INFO] [stdout]    |                ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `RootObject` is never constructed
[INFO] [stdout]   --> src/heap_dump.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum AnyHeapObject {
[INFO] [stdout]    |      ------------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 14 |     RootObject(RootObject)
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `AnyHeapObject` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_value` is never used
[INFO] [stdout]   --> src/heap_dump.rs:90:8
[INFO] [stdout]    |
[INFO] [stdout] 85 | impl RootObject {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 90 |     fn from_value(value: Value) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.16s
[INFO] running `Command { std: "docker" "inspect" "d854e970f7822e8013631377654fc911723de50b4ada54d8aff66c50f3a52ae8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d854e970f7822e8013631377654fc911723de50b4ada54d8aff66c50f3a52ae8", kill_on_drop: false }`
[INFO] [stdout] d854e970f7822e8013631377654fc911723de50b4ada54d8aff66c50f3a52ae8