[INFO] fetching crate sequencetree 0.1.4... [INFO] checking sequencetree-0.1.4 against master#94b72d6bebbddb5d17860914c4544f37365e988c for pr-122789 [INFO] extracting crate sequencetree 0.1.4 into /workspace/builds/worker-7-tc1/source [INFO] validating manifest of crates.io crate sequencetree 0.1.4 on toolchain 94b72d6bebbddb5d17860914c4544f37365e988c [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+94b72d6bebbddb5d17860914c4544f37365e988c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate sequencetree 0.1.4 [INFO] finished tweaking crates.io crate sequencetree 0.1.4 [INFO] tweaked toml for crates.io crate sequencetree 0.1.4 written to /workspace/builds/worker-7-tc1/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+94b72d6bebbddb5d17860914c4544f37365e988c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+94b72d6bebbddb5d17860914c4544f37365e988c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] warning: only one of `license` or `license-file` is necessary [INFO] [stderr] `license` should be used if the package license can be expressed with a standard SPDX expression. [INFO] [stderr] `license-file` should be used if the package uses a non-standard license. [INFO] [stderr] See https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields for more information. [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+94b72d6bebbddb5d17860914c4544f37365e988c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] c858462c39646f645a0491a14de77f5be7d3ad32b2c9dbc14daf1582a1745273 [INFO] running `Command { std: "docker" "start" "-a" "c858462c39646f645a0491a14de77f5be7d3ad32b2c9dbc14daf1582a1745273", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "c858462c39646f645a0491a14de77f5be7d3ad32b2c9dbc14daf1582a1745273", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c858462c39646f645a0491a14de77f5be7d3ad32b2c9dbc14daf1582a1745273", kill_on_drop: false }` [INFO] [stdout] c858462c39646f645a0491a14de77f5be7d3ad32b2c9dbc14daf1582a1745273 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+94b72d6bebbddb5d17860914c4544f37365e988c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 749bf4886b87d0db7e6aa61273af88f51227bccb05d798802e03f2f6776051d9 [INFO] running `Command { std: "docker" "start" "-a" "749bf4886b87d0db7e6aa61273af88f51227bccb05d798802e03f2f6776051d9", kill_on_drop: false }` [INFO] [stderr] warning: only one of `license` or `license-file` is necessary [INFO] [stderr] `license` should be used if the package license can be expressed with a standard SPDX expression. [INFO] [stderr] `license-file` should be used if the package uses a non-standard license. [INFO] [stderr] See https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields for more information. [INFO] [stderr] Checking sequencetree v0.1.4 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `std::fmt::Debug` [INFO] [stdout] --> src/binarysearchtree.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::fmt::Debug; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binarysearchtree.rs:81:9 [INFO] [stdout] | [INFO] [stdout] 81 | let mut val = match &mut n.val { [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binarysearchtree.rs:104:9 [INFO] [stdout] | [INFO] [stdout] 104 | let mut val = match &mut n.val { [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::fmt::Debug` [INFO] [stdout] --> src/binarysearchtree.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::fmt::Debug; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/sequencetree.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let mut n = create_node(key, i, val); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `set_value` is never used [INFO] [stdout] --> src/sequencetree.rs:30:8 [INFO] [stdout] | [INFO] [stdout] 9 | impl Node { [INFO] [stdout] | -------------------------------------------------------------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 30 | fn set_value(&mut self, val: T) { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `Duration` [INFO] [stdout] --> src/lib.rs:11:21 [INFO] [stdout] | [INFO] [stdout] 11 | use std::time::{Duration, Instant}; [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `crate::binarysearchtree::BTree` [INFO] [stdout] --> src/lib.rs:12:9 [INFO] [stdout] | [INFO] [stdout] 12 | use crate::binarysearchtree::BTree; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binarysearchtree.rs:81:9 [INFO] [stdout] | [INFO] [stdout] 81 | let mut val = match &mut n.val { [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binarysearchtree.rs:104:9 [INFO] [stdout] | [INFO] [stdout] 104 | let mut val = match &mut n.val { [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/sequencetree.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let mut n = create_node(key, i, val); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/lib.rs:123:13 [INFO] [stdout] | [INFO] [stdout] 123 | for i in 0u64 .. TEST_SCALE { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `key` is assigned to, but never used [INFO] [stdout] --> src/lib.rs:131:17 [INFO] [stdout] | [INFO] [stdout] 131 | let mut key = String::new(); [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_key` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `key` is never read [INFO] [stdout] --> src/lib.rs:133:13 [INFO] [stdout] | [INFO] [stdout] 133 | key = gen_str(&mut rng); [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `set_value` is never used [INFO] [stdout] --> src/sequencetree.rs:30:8 [INFO] [stdout] | [INFO] [stdout] 9 | impl Node { [INFO] [stdout] | -------------------------------------------------------------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 30 | fn set_value(&mut self, val: T) { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.23s [INFO] running `Command { std: "docker" "inspect" "749bf4886b87d0db7e6aa61273af88f51227bccb05d798802e03f2f6776051d9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "749bf4886b87d0db7e6aa61273af88f51227bccb05d798802e03f2f6776051d9", kill_on_drop: false }` [INFO] [stdout] 749bf4886b87d0db7e6aa61273af88f51227bccb05d798802e03f2f6776051d9 [INFO] checking sequencetree-0.1.4 against try#cb4bf0ee9ea9dac86332c9e48c07269c7edc21dc for pr-122789 [INFO] extracting crate sequencetree 0.1.4 into /workspace/builds/worker-7-tc2/source [INFO] validating manifest of crates.io crate sequencetree 0.1.4 on toolchain cb4bf0ee9ea9dac86332c9e48c07269c7edc21dc [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cb4bf0ee9ea9dac86332c9e48c07269c7edc21dc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate sequencetree 0.1.4 [INFO] finished tweaking crates.io crate sequencetree 0.1.4 [INFO] tweaked toml for crates.io crate sequencetree 0.1.4 written to /workspace/builds/worker-7-tc2/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cb4bf0ee9ea9dac86332c9e48c07269c7edc21dc" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cb4bf0ee9ea9dac86332c9e48c07269c7edc21dc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] warning: only one of `license` or `license-file` is necessary [INFO] [stderr] `license` should be used if the package license can be expressed with a standard SPDX expression. [INFO] [stderr] `license-file` should be used if the package uses a non-standard license. [INFO] [stderr] See https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields for more information. [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+cb4bf0ee9ea9dac86332c9e48c07269c7edc21dc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 46e3fd0173c60c57b0192235bba7d479b163262dc294f7dd7775b70fe8a6b494 [INFO] running `Command { std: "docker" "start" "-a" "46e3fd0173c60c57b0192235bba7d479b163262dc294f7dd7775b70fe8a6b494", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "46e3fd0173c60c57b0192235bba7d479b163262dc294f7dd7775b70fe8a6b494", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "46e3fd0173c60c57b0192235bba7d479b163262dc294f7dd7775b70fe8a6b494", kill_on_drop: false }` [INFO] [stdout] 46e3fd0173c60c57b0192235bba7d479b163262dc294f7dd7775b70fe8a6b494 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "-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" "+cb4bf0ee9ea9dac86332c9e48c07269c7edc21dc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 5eb7fcf392c46245e68ac708931ae0f80b5565e3e62eb3c64b8962da6716b4e9 [INFO] running `Command { std: "docker" "start" "-a" "5eb7fcf392c46245e68ac708931ae0f80b5565e3e62eb3c64b8962da6716b4e9", kill_on_drop: false }` [INFO] [stderr] warning: only one of `license` or `license-file` is necessary [INFO] [stderr] `license` should be used if the package license can be expressed with a standard SPDX expression. [INFO] [stderr] `license-file` should be used if the package uses a non-standard license. [INFO] [stderr] See https://doc.rust-lang.org/cargo/reference/manifest.html#the-license-and-license-file-fields for more information. [INFO] [stderr] Checking sequencetree v0.1.4 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `std::fmt::Debug` [INFO] [stdout] --> src/binarysearchtree.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::fmt::Debug; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binarysearchtree.rs:81:9 [INFO] [stdout] | [INFO] [stdout] 81 | let mut val = match &mut n.val { [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binarysearchtree.rs:104:9 [INFO] [stdout] | [INFO] [stdout] 104 | let mut val = match &mut n.val { [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/sequencetree.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let mut n = create_node(key, i, val); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0515]: cannot return value referencing temporary value [INFO] [stdout] --> src/sequencetree.rs:69:5 [INFO] [stdout] | [INFO] [stdout] 69 | / match node.next.search( key[i].to_owned() ) { [INFO] [stdout] 70 | | Some(n) => { [INFO] [stdout] 71 | | if i == key.len() - 1 { [INFO] [stdout] 72 | | return &n.value; [INFO] [stdout] ... | [INFO] [stdout] 78 | | None => &None [INFO] [stdout] | | ---- temporary value created here [INFO] [stdout] 79 | | } [INFO] [stdout] | |_____^ returns a value referencing data owned by the current function [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 1 previous error; 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0515`. [INFO] [stdout] [INFO] [stderr] error: could not compile `sequencetree` (lib) due to 2 previous errors; 4 warnings emitted [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: unused import: `std::fmt::Debug` [INFO] [stdout] --> src/binarysearchtree.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::fmt::Debug; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `Duration` [INFO] [stdout] --> src/lib.rs:11:21 [INFO] [stdout] | [INFO] [stdout] 11 | use std::time::{Duration, Instant}; [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `crate::binarysearchtree::BTree` [INFO] [stdout] --> src/lib.rs:12:9 [INFO] [stdout] | [INFO] [stdout] 12 | use crate::binarysearchtree::BTree; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binarysearchtree.rs:81:9 [INFO] [stdout] | [INFO] [stdout] 81 | let mut val = match &mut n.val { [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/binarysearchtree.rs:104:9 [INFO] [stdout] | [INFO] [stdout] 104 | let mut val = match &mut n.val { [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/sequencetree.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let mut n = create_node(key, i, val); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0515]: cannot return value referencing temporary value [INFO] [stdout] --> src/sequencetree.rs:69:5 [INFO] [stdout] | [INFO] [stdout] 69 | / match node.next.search( key[i].to_owned() ) { [INFO] [stdout] 70 | | Some(n) => { [INFO] [stdout] 71 | | if i == key.len() - 1 { [INFO] [stdout] 72 | | return &n.value; [INFO] [stdout] ... | [INFO] [stdout] 78 | | None => &None [INFO] [stdout] | | ---- temporary value created here [INFO] [stdout] 79 | | } [INFO] [stdout] | |_____^ returns a value referencing data owned by the current function [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/lib.rs:123:13 [INFO] [stdout] | [INFO] [stdout] 123 | for i in 0u64 .. TEST_SCALE { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `key` is assigned to, but never used [INFO] [stdout] --> src/lib.rs:131:17 [INFO] [stdout] | [INFO] [stdout] 131 | let mut key = String::new(); [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_key` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `key` is never read [INFO] [stdout] --> src/lib.rs:133:13 [INFO] [stdout] | [INFO] [stdout] 133 | key = gen_str(&mut rng); [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 1 previous error; 9 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0515`. [INFO] [stdout] [INFO] [stderr] error: could not compile `sequencetree` (lib test) due to 2 previous errors; 9 warnings emitted [INFO] running `Command { std: "docker" "inspect" "5eb7fcf392c46245e68ac708931ae0f80b5565e3e62eb3c64b8962da6716b4e9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5eb7fcf392c46245e68ac708931ae0f80b5565e3e62eb3c64b8962da6716b4e9", kill_on_drop: false }` [INFO] [stdout] 5eb7fcf392c46245e68ac708931ae0f80b5565e3e62eb3c64b8962da6716b4e9