[INFO] cloning repository https://github.com/enjarai/nbt-parser
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/enjarai/nbt-parser" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fenjarai%2Fnbt-parser", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fenjarai%2Fnbt-parser'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa8df68d450f1677f335f7980c975e454360d3d2
[INFO] checking enjarai/nbt-parser against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fenjarai%2Fnbt-parser" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/enjarai/nbt-parser
[INFO] finished tweaking git repo https://github.com/enjarai/nbt-parser
[INFO] tweaked toml for git repo https://github.com/enjarai/nbt-parser written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/enjarai/nbt-parser on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/enjarai/nbt-parser 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a70dfca7d1356a3464d530729881a2f5749403e9c4f5e99b3c250fbdea4f5789
[INFO] running `Command { std: "docker" "start" "-a" "a70dfca7d1356a3464d530729881a2f5749403e9c4f5e99b3c250fbdea4f5789", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a70dfca7d1356a3464d530729881a2f5749403e9c4f5e99b3c250fbdea4f5789", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a70dfca7d1356a3464d530729881a2f5749403e9c4f5e99b3c250fbdea4f5789", kill_on_drop: false }`
[INFO] [stdout] a70dfca7d1356a3464d530729881a2f5749403e9c4f5e99b3c250fbdea4f5789
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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 -Dunmustuse_in_always_ok" "-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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7b4add86fc8da819d67bfdc8185e854abf98481e91d0cb9ddb10620895b1f459
[INFO] running `Command { std: "docker" "start" "-a" "7b4add86fc8da819d67bfdc8185e854abf98481e91d0cb9ddb10620895b1f459", kill_on_drop: false }`
[INFO] [stderr]     Checking flate2 v1.0.25
[INFO] [stderr]     Checking nbt-parser v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/tag.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 |     InvalidUtf8(FromUtf8Error),
[INFO] [stdout]    |     ----------- ^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TagError` has a derived impl for the trait `Debug`, but this is 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] 10 -     InvalidUtf8(FromUtf8Error),
[INFO] [stdout] 10 +     InvalidUtf8(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/tag.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |     IoError(io::Error)
[INFO] [stdout]    |     ------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TagError` has a derived impl for the trait `Debug`, but this is 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 -     IoError(io::Error)
[INFO] [stdout] 11 +     IoError(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/tag.rs:107:12
[INFO] [stdout]     |
[INFO] [stdout]  81 | impl Tag {
[INFO] [stdout]     | -------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 107 |     pub fn byte(&self) -> Option<&i8> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 114 |     pub fn short(&self) -> Option<&i16> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 121 |     pub fn int(&self) -> Option<&i32> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 128 |     pub fn long(&self) -> Option<&i64> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 135 |     pub fn float(&self) -> Option<&f32> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 142 |     pub fn double(&self) -> Option<&f64> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 149 |     pub fn byte_array(&self) -> Option<&Vec<i8>> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 156 |     pub fn string(&self) -> Option<&String> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 163 |     pub fn list(&self) -> Option<&Vec<Tag>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 170 |     pub fn compound(&self) -> Option<&HashMap<String, Tag>> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 177 |     pub fn int_array(&self) -> Option<&Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 184 |     pub fn long_array(&self) -> Option<&Vec<i64>> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 191 |     pub fn byte_mut(&mut self) -> Option<&mut i8> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 |     pub fn short_mut(&mut self) -> Option<&mut i16> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 205 |     pub fn int_mut(&mut self) -> Option<&mut i32> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 212 |     pub fn long_mut(&mut self) -> Option<&mut i64> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 219 |     pub fn float_mut(&mut self) -> Option<&mut f32> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 226 |     pub fn double_mut(&mut self) -> Option<&mut f64> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 233 |     pub fn byte_array_mut(&mut self) -> Option<&mut Vec<i8>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 240 |     pub fn string_mut(&mut self) -> Option<&mut String> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 247 |     pub fn list_mut(&mut self) -> Option<&mut Vec<Tag>> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 254 |     pub fn compound_mut(&mut self) -> Option<&mut HashMap<String, Tag>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 261 |     pub fn int_array_mut(&mut self) -> Option<&mut Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 268 |     pub fn long_array_mut(&mut self) -> Option<&mut Vec<i64>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/read.rs:52:30
[INFO] [stdout]    |
[INFO] [stdout] 52 |                 Ok(StringTag(String::from_utf8_lossy(&eat(buf, length as usize)?).parse().unwrap()))
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nbt-parser` (bin "nbt-parser" test) due to 1 previous error; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/tag.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 |     InvalidUtf8(FromUtf8Error),
[INFO] [stdout]    |     ----------- ^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TagError` has a derived impl for the trait `Debug`, but this is 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] 10 -     InvalidUtf8(FromUtf8Error),
[INFO] [stdout] 10 +     InvalidUtf8(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/tag.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |     IoError(io::Error)
[INFO] [stdout]    |     ------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TagError` has a derived impl for the trait `Debug`, but this is 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 -     IoError(io::Error)
[INFO] [stdout] 11 +     IoError(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/tag.rs:107:12
[INFO] [stdout]     |
[INFO] [stdout]  81 | impl Tag {
[INFO] [stdout]     | -------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 107 |     pub fn byte(&self) -> Option<&i8> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 114 |     pub fn short(&self) -> Option<&i16> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 121 |     pub fn int(&self) -> Option<&i32> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 128 |     pub fn long(&self) -> Option<&i64> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 135 |     pub fn float(&self) -> Option<&f32> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 142 |     pub fn double(&self) -> Option<&f64> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 149 |     pub fn byte_array(&self) -> Option<&Vec<i8>> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 156 |     pub fn string(&self) -> Option<&String> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 163 |     pub fn list(&self) -> Option<&Vec<Tag>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 170 |     pub fn compound(&self) -> Option<&HashMap<String, Tag>> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 177 |     pub fn int_array(&self) -> Option<&Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 184 |     pub fn long_array(&self) -> Option<&Vec<i64>> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 191 |     pub fn byte_mut(&mut self) -> Option<&mut i8> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 |     pub fn short_mut(&mut self) -> Option<&mut i16> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 205 |     pub fn int_mut(&mut self) -> Option<&mut i32> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 212 |     pub fn long_mut(&mut self) -> Option<&mut i64> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 219 |     pub fn float_mut(&mut self) -> Option<&mut f32> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 226 |     pub fn double_mut(&mut self) -> Option<&mut f64> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 233 |     pub fn byte_array_mut(&mut self) -> Option<&mut Vec<i8>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 240 |     pub fn string_mut(&mut self) -> Option<&mut String> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 247 |     pub fn list_mut(&mut self) -> Option<&mut Vec<Tag>> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 254 |     pub fn compound_mut(&mut self) -> Option<&mut HashMap<String, Tag>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 261 |     pub fn int_array_mut(&mut self) -> Option<&mut Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 268 |     pub fn long_array_mut(&mut self) -> Option<&mut Vec<i64>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/read.rs:52:30
[INFO] [stdout]    |
[INFO] [stdout] 52 |                 Ok(StringTag(String::from_utf8_lossy(&eat(buf, length as usize)?).parse().unwrap()))
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `nbt-parser` (bin "nbt-parser") due to 1 previous error; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "7b4add86fc8da819d67bfdc8185e854abf98481e91d0cb9ddb10620895b1f459", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b4add86fc8da819d67bfdc8185e854abf98481e91d0cb9ddb10620895b1f459", kill_on_drop: false }`
[INFO] [stdout] 7b4add86fc8da819d67bfdc8185e854abf98481e91d0cb9ddb10620895b1f459
