[INFO] cloning repository https://github.com/WgZgYn/json
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/WgZgYn/json" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWgZgYn%2Fjson", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWgZgYn%2Fjson'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa3022864bfc2cec6eb3db9c1399566454181d29
[INFO] checking WgZgYn/json against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWgZgYn%2Fjson" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/WgZgYn/json
[INFO] finished tweaking git repo https://github.com/WgZgYn/json
[INFO] tweaked toml for git repo https://github.com/WgZgYn/json written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/WgZgYn/json on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/WgZgYn/json 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" "+1.95.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded crossbeam-deque v0.8.5
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[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 33c2c0ee238f231e9c148505b32c40f925079c0f0838131f18d03851c919ef45
[INFO] running `Command { std: "docker" "start" "-a" "33c2c0ee238f231e9c148505b32c40f925079c0f0838131f18d03851c919ef45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33c2c0ee238f231e9c148505b32c40f925079c0f0838131f18d03851c919ef45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33c2c0ee238f231e9c148505b32c40f925079c0f0838131f18d03851c919ef45", kill_on_drop: false }`
[INFO] [stdout] 33c2c0ee238f231e9c148505b32c40f925079c0f0838131f18d03851c919ef45
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6fe4b125a76ed43a6b3163d50d39fa068f60389a7cce1db02389124a9b9edcb7
[INFO] running `Command { std: "docker" "start" "-a" "6fe4b125a76ed43a6b3163d50d39fa068f60389a7cce1db02389124a9b9edcb7", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]    Compiling serde v1.0.203
[INFO] [stderr]     Checking hashbrown v0.14.5
[INFO] [stderr]     Checking equivalent v1.0.1
[INFO] [stderr]    Compiling serde_json v1.0.117
[INFO] [stderr]     Checking itoa v1.0.11
[INFO] [stderr]     Checking either v1.12.0
[INFO] [stderr]     Checking ryu v1.0.18
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
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[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking json_builder v0.1.0 (/opt/rustwide/workdir/json_builder)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> json_builder/src/main.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 |     JsonObject(JsonMap),
[INFO] [stdout]   |     ---------- ^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) 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] 7 -     JsonObject(JsonMap),
[INFO] [stdout] 7 +     JsonObject(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> json_builder/src/main.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 |     JsonArray(Vec<Value>),
[INFO] [stdout]   |     --------- ^^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[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] 8 -     JsonArray(Vec<Value>),
[INFO] [stdout] 8 +     JsonArray(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> json_builder/src/main.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     String(String),
[INFO] [stdout]   |     ------ ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[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] 9 -     String(String),
[INFO] [stdout] 9 +     String(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> json_builder/src/main.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Boolean(bool),
[INFO] [stdout]    |     ------- ^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[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] 10 -     Boolean(bool),
[INFO] [stdout] 10 +     Boolean(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> json_builder/src/main.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Number(f64),
[INFO] [stdout]    |     ------ ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[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 -     Number(f64),
[INFO] [stdout] 11 +     Number(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> json_builder/src/main.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 |     JsonObject(JsonMap),
[INFO] [stdout]   |     ---------- ^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) 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] 7 -     JsonObject(JsonMap),
[INFO] [stdout] 7 +     JsonObject(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> json_builder/src/main.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 |     JsonArray(Vec<Value>),
[INFO] [stdout]   |     --------- ^^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[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] 8 -     JsonArray(Vec<Value>),
[INFO] [stdout] 8 +     JsonArray(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> json_builder/src/main.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     String(String),
[INFO] [stdout]   |     ------ ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[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] 9 -     String(String),
[INFO] [stdout] 9 +     String(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> json_builder/src/main.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Boolean(bool),
[INFO] [stdout]    |     ------- ^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[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] 10 -     Boolean(bool),
[INFO] [stdout] 10 +     Boolean(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> json_builder/src/main.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Number(f64),
[INFO] [stdout]    |     ------ ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Value` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[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 -     Number(f64),
[INFO] [stdout] 11 +     Number(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking json_parser v0.1.0 (/opt/rustwide/workdir/json_parser)
[INFO] [stdout] warning: unused import: `token::fmt_print_tokens`
[INFO] [stdout]  --> json_parser/src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use token::fmt_print_tokens;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `token::fmt_print_tokens`
[INFO] [stdout]  --> json_parser/src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use token::fmt_print_tokens;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fmt_print_tokens` is never used
[INFO] [stdout]   --> json_parser/src/token.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn fmt_print_tokens(tokens: &[Token]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `JsonBuilder` is never used
[INFO] [stdout]   --> json_parser/src/trait.rs:40:7
[INFO] [stdout]    |
[INFO] [stdout] 40 | trait JsonBuilder {
[INFO] [stdout]    |       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `NULL` is never used
[INFO] [stdout]   --> json_parser/src/value.rs:54:20
[INFO] [stdout]    |
[INFO] [stdout] 54 |         static mut NULL: Value = Value::Null;
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `read_string1` is never used
[INFO] [stdout]    --> json_parser/src/tokenizer/char_tokenizer.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout]  69 | impl<'a> CharTokenizer<'a> {
[INFO] [stdout]     | -------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 101 |     fn read_string1(&mut self) -> Result<Token, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `split` and `find` are never used
[INFO] [stdout]   --> json_parser/src/tokenizer/multi_tokenizer.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl<'a> MultiTokenizer<'a> {
[INFO] [stdout]    | --------------------------- associated items in this implementation
[INFO] [stdout] 13 |     fn split(&self) -> (usize, usize, usize) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn find(bytes: &[u8], mut start: i32) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `has_next` is never used
[INFO] [stdout]   --> json_parser/src/parser/token_owner.rs:42:19
[INFO] [stdout]    |
[INFO] [stdout] 41 | impl TokenOwner {
[INFO] [stdout]    | --------------- method in this implementation
[INFO] [stdout] 42 |     pub(crate) fn has_next(&self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `has_next`, `build_pair`, `build_object`, `build_array`, and `build_value` are never used
[INFO] [stdout]    --> json_parser/src/parser/token_reader.rs:34:8
[INFO] [stdout]     |
[INFO] [stdout]  33 | impl<'a> TokenReader<'a> {
[INFO] [stdout]     | ------------------------ methods in this implementation
[INFO] [stdout]  34 |     fn has_next(&mut self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  38 |     fn build_pair(&mut self) -> Result<(&String, Value), ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  68 |     fn build_object(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 110 |     fn build_array(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 163 |     fn build_value(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TokenStream1` is never constructed
[INFO] [stdout]  --> json_parser/src/parser/token_stream_fork.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct TokenStream1<T: StreamTokenizer> {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `peek` and `next` are never used
[INFO] [stdout]   --> json_parser/src/parser/token_stream_fork.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T: StreamTokenizer> TokenStream1<T> {
[INFO] [stdout]    | ---------------------------------------- methods in this implementation
[INFO] [stdout] 12 |     fn peek(&mut self) -> Result<&Token, ReadError> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn next(&mut self) -> Result<Token, ReadError> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `has_next`, `build_pair`, `build_object`, `build_array`, and `build_value` are never used
[INFO] [stdout]    --> json_parser/src/parser/token_stream_fork.rs:31:12
[INFO] [stdout]     |
[INFO] [stdout]  30 | impl<T: StreamTokenizer> TokenStream1<T> {
[INFO] [stdout]     | ---------------------------------------- methods in this implementation
[INFO] [stdout]  31 |     pub fn has_next(&mut self) -> bool {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  35 |     fn build_pair(&mut self) -> Result<(String, Value), ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  72 |     fn build_object(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 118 |     fn build_array(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 171 |     pub fn build_value(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> json_parser/src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `json_parser` (bin "json_parser") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> json_parser/src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `json_parser` (bin "json_parser" test) due to 1 previous error
[INFO] [stdout] warning: function `fmt_print_tokens` is never used
[INFO] [stdout]   --> json_parser/src/token.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn fmt_print_tokens(tokens: &[Token]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `JsonBuilder` is never used
[INFO] [stdout]   --> json_parser/src/trait.rs:40:7
[INFO] [stdout]    |
[INFO] [stdout] 40 | trait JsonBuilder {
[INFO] [stdout]    |       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `NULL` is never used
[INFO] [stdout]   --> json_parser/src/value.rs:54:20
[INFO] [stdout]    |
[INFO] [stdout] 54 |         static mut NULL: Value = Value::Null;
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `read_string1` is never used
[INFO] [stdout]    --> json_parser/src/tokenizer/char_tokenizer.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout]  69 | impl<'a> CharTokenizer<'a> {
[INFO] [stdout]     | -------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 101 |     fn read_string1(&mut self) -> Result<Token, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `split` and `find` are never used
[INFO] [stdout]   --> json_parser/src/tokenizer/multi_tokenizer.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl<'a> MultiTokenizer<'a> {
[INFO] [stdout]    | --------------------------- associated items in this implementation
[INFO] [stdout] 13 |     fn split(&self) -> (usize, usize, usize) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn find(bytes: &[u8], mut start: i32) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `has_next` is never used
[INFO] [stdout]   --> json_parser/src/parser/token_owner.rs:42:19
[INFO] [stdout]    |
[INFO] [stdout] 41 | impl TokenOwner {
[INFO] [stdout]    | --------------- method in this implementation
[INFO] [stdout] 42 |     pub(crate) fn has_next(&self) -> bool {
[INFO] [stdout]    |                   ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `has_next`, `build_pair`, `build_object`, `build_array`, and `build_value` are never used
[INFO] [stdout]    --> json_parser/src/parser/token_reader.rs:34:8
[INFO] [stdout]     |
[INFO] [stdout]  33 | impl<'a> TokenReader<'a> {
[INFO] [stdout]     | ------------------------ methods in this implementation
[INFO] [stdout]  34 |     fn has_next(&mut self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  38 |     fn build_pair(&mut self) -> Result<(&String, Value), ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  68 |     fn build_object(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 110 |     fn build_array(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 163 |     fn build_value(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TokenStream1` is never constructed
[INFO] [stdout]  --> json_parser/src/parser/token_stream_fork.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct TokenStream1<T: StreamTokenizer> {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `peek` and `next` are never used
[INFO] [stdout]   --> json_parser/src/parser/token_stream_fork.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl<T: StreamTokenizer> TokenStream1<T> {
[INFO] [stdout]    | ---------------------------------------- methods in this implementation
[INFO] [stdout] 12 |     fn peek(&mut self) -> Result<&Token, ReadError> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn next(&mut self) -> Result<Token, ReadError> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `has_next`, `build_pair`, `build_object`, `build_array`, and `build_value` are never used
[INFO] [stdout]    --> json_parser/src/parser/token_stream_fork.rs:31:12
[INFO] [stdout]     |
[INFO] [stdout]  30 | impl<T: StreamTokenizer> TokenStream1<T> {
[INFO] [stdout]     | ---------------------------------------- methods in this implementation
[INFO] [stdout]  31 |     pub fn has_next(&mut self) -> bool {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  35 |     fn build_pair(&mut self) -> Result<(String, Value), ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  72 |     fn build_object(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 118 |     fn build_array(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 171 |     pub fn build_value(&mut self) -> Result<Value, ReadError> {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6fe4b125a76ed43a6b3163d50d39fa068f60389a7cce1db02389124a9b9edcb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fe4b125a76ed43a6b3163d50d39fa068f60389a7cce1db02389124a9b9edcb7", kill_on_drop: false }`
[INFO] [stdout] 6fe4b125a76ed43a6b3163d50d39fa068f60389a7cce1db02389124a9b9edcb7
