[INFO] fetching crate wolfram-expr 0.1.4...
[INFO] testing wolfram-expr-0.1.4 against master#ec6f9a5b4413f74386267ef8efc93712c2ce6db6 for pr-155739-1
[INFO] extracting crate wolfram-expr 0.1.4 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate wolfram-expr 0.1.4
[INFO] finished tweaking crates.io crate wolfram-expr 0.1.4
[INFO] tweaked toml for crates.io crate wolfram-expr 0.1.4 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate wolfram-expr 0.1.4 on toolchain ec6f9a5b4413f74386267ef8efc93712c2ce6db6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 3 packages to latest compatible versions
[INFO] [stderr]       Adding ordered-float v3.9.2 (available: v5.3.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ordered-float v3.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b30c63d16e9c7254a711f115dad601a3f7edfdc7707a58ff4ccd2b180e6ebfbc
[INFO] running `Command { std: "docker" "start" "-a" "b30c63d16e9c7254a711f115dad601a3f7edfdc7707a58ff4ccd2b180e6ebfbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b30c63d16e9c7254a711f115dad601a3f7edfdc7707a58ff4ccd2b180e6ebfbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b30c63d16e9c7254a711f115dad601a3f7edfdc7707a58ff4ccd2b180e6ebfbc", kill_on_drop: false }`
[INFO] [stdout] b30c63d16e9c7254a711f115dad601a3f7edfdc7707a58ff4ccd2b180e6ebfbc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f249f9beb101640394961d47d6957d6d67c5de970d82b2d7fcfc5c107e06de5f
[INFO] running `Command { std: "docker" "start" "-a" "f249f9beb101640394961d47d6957d6d67c5de970d82b2d7fcfc5c107e06de5f", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling ordered-float v3.9.2
[INFO] [stderr]    Compiling wolfram-expr v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `ExprRefCmp` is never constructed
[INFO] [stdout]   --> src/ptr_cmp.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct ExprRefCmp(pub Expr);
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[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/symbol.rs:159:26
[INFO] [stdout]     |
[INFO] [stdout] 159 |     pub fn as_symbol_ref(&self) -> SymbolRef {
[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] 159 |     pub fn as_symbol_ref(&self) -> SymbolRef<'_> {
[INFO] [stdout]     |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:166:20
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub fn context(&self) -> ContextRef {
[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] 166 |     pub fn context(&self) -> ContextRef<'_> {
[INFO] [stdout]     |                                        ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:171:24
[INFO] [stdout]     |
[INFO] [stdout] 171 |     pub fn symbol_name(&self) -> SymbolNameRef {
[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] 171 |     pub fn symbol_name(&self) -> SymbolNameRef<'_> {
[INFO] [stdout]     |                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:187:31
[INFO] [stdout]     |
[INFO] [stdout] 187 |     pub fn as_symbol_name_ref(&self) -> SymbolNameRef {
[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] 187 |     pub fn as_symbol_name_ref(&self) -> SymbolNameRef<'_> {
[INFO] [stdout]     |                                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:267:23
[INFO] [stdout]     |
[INFO] [stdout] 267 |     pub fn components(&self) -> Vec<SymbolNameRef> {
[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] 267 |     pub fn components(&self) -> Vec<SymbolNameRef<'_>> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:284:27
[INFO] [stdout]     |
[INFO] [stdout] 284 |     pub fn as_context_ref(&self) -> ContextRef {
[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] 284 |     pub fn as_context_ref(&self) -> ContextRef<'_> {
[INFO] [stdout]     |                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:313:23
[INFO] [stdout]     |
[INFO] [stdout] 313 |     pub fn components(&self) -> Vec<SymbolNameRef> {
[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] 313 |     pub fn components(&self) -> Vec<SymbolNameRef<'_>> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.45s
[INFO] running `Command { std: "docker" "inspect" "f249f9beb101640394961d47d6957d6d67c5de970d82b2d7fcfc5c107e06de5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f249f9beb101640394961d47d6957d6d67c5de970d82b2d7fcfc5c107e06de5f", kill_on_drop: false }`
[INFO] [stdout] f249f9beb101640394961d47d6957d6d67c5de970d82b2d7fcfc5c107e06de5f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 118db1e60773da76a8bf265d123e3a86d4929649a6bf145c0b098a0c008ddca9
[INFO] running `Command { std: "docker" "start" "-a" "118db1e60773da76a8bf265d123e3a86d4929649a6bf145c0b098a0c008ddca9", kill_on_drop: false }`
[INFO] [stdout] warning: struct `ExprRefCmp` is never constructed
[INFO] [stdout]   --> src/ptr_cmp.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct ExprRefCmp(pub Expr);
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[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/symbol.rs:159:26
[INFO] [stdout]     |
[INFO] [stdout] 159 |     pub fn as_symbol_ref(&self) -> SymbolRef {
[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] 159 |     pub fn as_symbol_ref(&self) -> SymbolRef<'_> {
[INFO] [stdout]     |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:166:20
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub fn context(&self) -> ContextRef {
[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] 166 |     pub fn context(&self) -> ContextRef<'_> {
[INFO] [stdout]     |                                        ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling wolfram-expr v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:171:24
[INFO] [stdout]     |
[INFO] [stdout] 171 |     pub fn symbol_name(&self) -> SymbolNameRef {
[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] 171 |     pub fn symbol_name(&self) -> SymbolNameRef<'_> {
[INFO] [stdout]     |                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:187:31
[INFO] [stdout]     |
[INFO] [stdout] 187 |     pub fn as_symbol_name_ref(&self) -> SymbolNameRef {
[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] 187 |     pub fn as_symbol_name_ref(&self) -> SymbolNameRef<'_> {
[INFO] [stdout]     |                                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:267:23
[INFO] [stdout]     |
[INFO] [stdout] 267 |     pub fn components(&self) -> Vec<SymbolNameRef> {
[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] 267 |     pub fn components(&self) -> Vec<SymbolNameRef<'_>> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:284:27
[INFO] [stdout]     |
[INFO] [stdout] 284 |     pub fn as_context_ref(&self) -> ContextRef {
[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] 284 |     pub fn as_context_ref(&self) -> ContextRef<'_> {
[INFO] [stdout]     |                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:313:23
[INFO] [stdout]     |
[INFO] [stdout] 313 |     pub fn components(&self) -> Vec<SymbolNameRef> {
[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] 313 |     pub fn components(&self) -> Vec<SymbolNameRef<'_>> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ExprRefCmp` is never constructed
[INFO] [stdout]   --> src/ptr_cmp.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct ExprRefCmp(pub Expr);
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[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/symbol.rs:159:26
[INFO] [stdout]     |
[INFO] [stdout] 159 |     pub fn as_symbol_ref(&self) -> SymbolRef {
[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] 159 |     pub fn as_symbol_ref(&self) -> SymbolRef<'_> {
[INFO] [stdout]     |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:166:20
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub fn context(&self) -> ContextRef {
[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] 166 |     pub fn context(&self) -> ContextRef<'_> {
[INFO] [stdout]     |                                        ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:171:24
[INFO] [stdout]     |
[INFO] [stdout] 171 |     pub fn symbol_name(&self) -> SymbolNameRef {
[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] 171 |     pub fn symbol_name(&self) -> SymbolNameRef<'_> {
[INFO] [stdout]     |                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:187:31
[INFO] [stdout]     |
[INFO] [stdout] 187 |     pub fn as_symbol_name_ref(&self) -> SymbolNameRef {
[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] 187 |     pub fn as_symbol_name_ref(&self) -> SymbolNameRef<'_> {
[INFO] [stdout]     |                                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:267:23
[INFO] [stdout]     |
[INFO] [stdout] 267 |     pub fn components(&self) -> Vec<SymbolNameRef> {
[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] 267 |     pub fn components(&self) -> Vec<SymbolNameRef<'_>> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:284:27
[INFO] [stdout]     |
[INFO] [stdout] 284 |     pub fn as_context_ref(&self) -> ContextRef {
[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] 284 |     pub fn as_context_ref(&self) -> ContextRef<'_> {
[INFO] [stdout]     |                                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/symbol.rs:313:23
[INFO] [stdout]     |
[INFO] [stdout] 313 |     pub fn components(&self) -> Vec<SymbolNameRef> {
[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] 313 |     pub fn components(&self) -> Vec<SymbolNameRef<'_>> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.71s
[INFO] running `Command { std: "docker" "inspect" "118db1e60773da76a8bf265d123e3a86d4929649a6bf145c0b098a0c008ddca9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "118db1e60773da76a8bf265d123e3a86d4929649a6bf145c0b098a0c008ddca9", kill_on_drop: false }`
[INFO] [stdout] 118db1e60773da76a8bf265d123e3a86d4929649a6bf145c0b098a0c008ddca9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] df7f21f686dfb854f5c59e8a7aeac98fc3c254cdbaaf5575a6cfc63ad505f6c0
[INFO] running `Command { std: "docker" "start" "-a" "df7f21f686dfb854f5c59e8a7aeac98fc3c254cdbaaf5575a6cfc63ad505f6c0", kill_on_drop: false }`
[INFO] [stderr] warning: struct `ExprRefCmp` is never constructed
[INFO] [stderr]   --> src/ptr_cmp.rs:37:12
[INFO] [stderr]    |
[INFO] [stderr] 37 | pub struct ExprRefCmp(pub Expr);
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/symbol.rs:159:26
[INFO] [stderr]     |
[INFO] [stderr] 159 |     pub fn as_symbol_ref(&self) -> SymbolRef {
[INFO] [stderr]     |                          ^^^^^     ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                          |
[INFO] [stderr]     |                          the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 159 |     pub fn as_symbol_ref(&self) -> SymbolRef<'_> {
[INFO] [stderr]     |                                             ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/symbol.rs:166:20
[INFO] [stderr]     |
[INFO] [stderr] 166 |     pub fn context(&self) -> ContextRef {
[INFO] [stderr]     |                    ^^^^^     ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                    |
[INFO] [stderr]     |                    the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 166 |     pub fn context(&self) -> ContextRef<'_> {
[INFO] [stderr]     |                                        ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/symbol.rs:171:24
[INFO] [stderr]     |
[INFO] [stderr] 171 |     pub fn symbol_name(&self) -> SymbolNameRef {
[INFO] [stderr]     |                        ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                        |
[INFO] [stderr]     |                        the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 171 |     pub fn symbol_name(&self) -> SymbolNameRef<'_> {
[INFO] [stderr]     |                                               ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/symbol.rs:187:31
[INFO] [stderr]     |
[INFO] [stderr] 187 |     pub fn as_symbol_name_ref(&self) -> SymbolNameRef {
[INFO] [stderr]     |                               ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                               |
[INFO] [stderr]     |                               the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 187 |     pub fn as_symbol_name_ref(&self) -> SymbolNameRef<'_> {
[INFO] [stderr]     |                                                      ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/symbol.rs:267:23
[INFO] [stderr]     |
[INFO] [stderr] 267 |     pub fn components(&self) -> Vec<SymbolNameRef> {
[INFO] [stderr]     |                       ^^^^^         ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                       |
[INFO] [stderr]     |                       the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 267 |     pub fn components(&self) -> Vec<SymbolNameRef<'_>> {
[INFO] [stderr]     |                                                  ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/symbol.rs:284:27
[INFO] [stderr]     |
[INFO] [stderr] 284 |     pub fn as_context_ref(&self) -> ContextRef {
[INFO] [stderr]     |                           ^^^^^     ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                           |
[INFO] [stderr]     |                           the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 284 |     pub fn as_context_ref(&self) -> ContextRef<'_> {
[INFO] [stderr]     |                                               ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/symbol.rs:313:23
[INFO] [stderr]     |
[INFO] [stderr] 313 |     pub fn components(&self) -> Vec<SymbolNameRef> {
[INFO] [stderr]     |                       ^^^^^         ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                       |
[INFO] [stderr]     |                       the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 313 |     pub fn components(&self) -> Vec<SymbolNameRef<'_>> {
[INFO] [stderr]     |                                                  ++++
[INFO] [stderr] 
[INFO] [stderr] warning: `wolfram-expr` (lib) generated 8 warnings (run `cargo fix --lib -p wolfram-expr` to apply 7 suggestions)
[INFO] [stderr] warning: `wolfram-expr` (lib test) generated 8 warnings (8 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/wolfram_expr-0b30aae5a737c224)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test symbol::parse::test_is_symbol_component ... ok
[INFO] [stdout] test symbol::parse::test_parse_symbol_like ... ok
[INFO] [stdout] test tests::test_symbol_like_parsing ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests wolfram_expr
[INFO] [stdout] 
[INFO] [stdout] running 13 tests
[INFO] [stdout] test src/lib.rs - Expr::rule_delayed (line 255) ... ok
[INFO] [stdout] test src/symbol.rs - symbol::Context::new (line 210) ... ok
[INFO] [stdout] test src/lib.rs - Expr::list (line 275) ... ok
[INFO] [stdout] test src/symbol.rs - symbol::RelativeContext::components (line 302) ... ok
[INFO] [stdout] test src/lib.rs - Expr (line 38) ... ok
[INFO] [stdout] test src/lib.rs - Expr::real (line 144) ... ok
[INFO] [stdout] test src/symbol.rs - symbol::SymbolRef<'s>::try_new (line 382) ... ok
[INFO] [stdout] test src/symbol.rs - symbol::Context::join (line 239) ... ok
[INFO] [stdout] test src/lib.rs - test_readme (line 49) ... ok
[INFO] [stdout] test src/symbol.rs - symbol::Symbol::new (line 143) ... ok
[INFO] [stdout] test src/lib.rs - Expr::rule (line 238) ... ok
[INFO] [stdout] test src/symbol.rs - symbol::Context::components (line 255) ... ok
[INFO] [stdout] test src/lib.rs - test_readme (line 37) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.71s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "df7f21f686dfb854f5c59e8a7aeac98fc3c254cdbaaf5575a6cfc63ad505f6c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df7f21f686dfb854f5c59e8a7aeac98fc3c254cdbaaf5575a6cfc63ad505f6c0", kill_on_drop: false }`
[INFO] [stdout] df7f21f686dfb854f5c59e8a7aeac98fc3c254cdbaaf5575a6cfc63ad505f6c0
