[INFO] fetching crate muncher 0.7.0...
[INFO] building muncher-0.7.0 against master#c7f6aa2869acdbf014d094c6e427e554e160b6db for pr-146237-2
[INFO] extracting crate muncher 0.7.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate muncher 0.7.0
[INFO] finished tweaking crates.io crate muncher 0.7.0
[INFO] tweaked toml for crates.io crate muncher 0.7.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate muncher 0.7.0 on toolchain c7f6aa2869acdbf014d094c6e427e554e160b6db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aa8871e0c1a4ba5a4dbe99e6901ece4a0b8409650e9f177a55efa2959cefe7c9
[INFO] running `Command { std: "docker" "start" "-a" "aa8871e0c1a4ba5a4dbe99e6901ece4a0b8409650e9f177a55efa2959cefe7c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa8871e0c1a4ba5a4dbe99e6901ece4a0b8409650e9f177a55efa2959cefe7c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa8871e0c1a4ba5a4dbe99e6901ece4a0b8409650e9f177a55efa2959cefe7c9", kill_on_drop: false }`
[INFO] [stdout] aa8871e0c1a4ba5a4dbe99e6901ece4a0b8409650e9f177a55efa2959cefe7c9
[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=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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84198bf7ad14804cb67f3ec1c3ad12552b43bb8b670934c100933caa574e6c56
[INFO] running `Command { std: "docker" "start" "-a" "84198bf7ad14804cb67f3ec1c3ad12552b43bb8b670934c100933caa574e6c56", kill_on_drop: false }`
[INFO] [stderr]    Compiling muncher v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `input` and `pos` are never read
[INFO] [stdout]   --> src/muncher.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Stack<'a> {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 16 |     input: &'a str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 17 |     stack: Vec<char>,
[INFO] [stdout] 18 |     pos: (usize, usize),
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Stack` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:185:17
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub fn fork(&self) -> Fork {
[INFO] [stdout]     |                 ^^^^^     ^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub fn fork(&self) -> Fork<'_> {
[INFO] [stdout]     |                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:200:24
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn brace_stack(&self) -> Stack {
[INFO] [stdout]     |                        ^^^^^     ^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn brace_stack(&self) -> Stack<'_> {
[INFO] [stdout]     |                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "84198bf7ad14804cb67f3ec1c3ad12552b43bb8b670934c100933caa574e6c56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84198bf7ad14804cb67f3ec1c3ad12552b43bb8b670934c100933caa574e6c56", kill_on_drop: false }`
[INFO] [stdout] 84198bf7ad14804cb67f3ec1c3ad12552b43bb8b670934c100933caa574e6c56
[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=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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef22074311bbeacd1d954dfaa303a53354dd7a93e9c46ae70282f6def80f9d98
[INFO] running `Command { std: "docker" "start" "-a" "ef22074311bbeacd1d954dfaa303a53354dd7a93e9c46ae70282f6def80f9d98", kill_on_drop: false }`
[INFO] [stdout] warning: fields `input` and `pos` are never read
[INFO] [stdout]   --> src/muncher.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Stack<'a> {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 16 |     input: &'a str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 17 |     stack: Vec<char>,
[INFO] [stdout] 18 |     pos: (usize, usize),
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Stack` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:185:17
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub fn fork(&self) -> Fork {
[INFO] [stdout]     |                 ^^^^^     ^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub fn fork(&self) -> Fork<'_> {
[INFO] [stdout]     |                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling muncher v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:200:24
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn brace_stack(&self) -> Stack {
[INFO] [stdout]     |                        ^^^^^     ^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn brace_stack(&self) -> Stack<'_> {
[INFO] [stdout]     |                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `input` and `pos` are never read
[INFO] [stdout]   --> src/muncher.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Stack<'a> {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 16 |     input: &'a str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 17 |     stack: Vec<char>,
[INFO] [stdout] 18 |     pos: (usize, usize),
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Stack` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:185:17
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub fn fork(&self) -> Fork {
[INFO] [stdout]     |                 ^^^^^     ^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub fn fork(&self) -> Fork<'_> {
[INFO] [stdout]     |                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:200:24
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn brace_stack(&self) -> Stack {
[INFO] [stdout]     |                        ^^^^^     ^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn brace_stack(&self) -> Stack<'_> {
[INFO] [stdout]     |                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.93s
[INFO] running `Command { std: "docker" "inspect" "ef22074311bbeacd1d954dfaa303a53354dd7a93e9c46ae70282f6def80f9d98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef22074311bbeacd1d954dfaa303a53354dd7a93e9c46ae70282f6def80f9d98", kill_on_drop: false }`
[INFO] [stdout] ef22074311bbeacd1d954dfaa303a53354dd7a93e9c46ae70282f6def80f9d98