[INFO] cloning repository https://github.com/Cestquilepatron/explain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Cestquilepatron/explain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCestquilepatron%2Fexplain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCestquilepatron%2Fexplain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 28158463d4daea12ba0516707ba848c84a5531cf
[INFO] checking Cestquilepatron/explain 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%2FCestquilepatron%2Fexplain" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Cestquilepatron/explain
[INFO] finished tweaking git repo https://github.com/Cestquilepatron/explain
[INFO] tweaked toml for git repo https://github.com/Cestquilepatron/explain written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Cestquilepatron/explain 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/Cestquilepatron/explain 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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 33b0bb855b4c8e0cbe3ac02a465395f6357cf71eeb7a166212da6e6190922668
[INFO] running `Command { std: "docker" "start" "-a" "33b0bb855b4c8e0cbe3ac02a465395f6357cf71eeb7a166212da6e6190922668", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33b0bb855b4c8e0cbe3ac02a465395f6357cf71eeb7a166212da6e6190922668", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33b0bb855b4c8e0cbe3ac02a465395f6357cf71eeb7a166212da6e6190922668", kill_on_drop: false }`
[INFO] [stdout] 33b0bb855b4c8e0cbe3ac02a465395f6357cf71eeb7a166212da6e6190922668
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] df998c1026d903827bb42456d7bbda2e3318c3965b3b715ea1e95a4f75b1d66f
[INFO] running `Command { std: "docker" "start" "-a" "df998c1026d903827bb42456d7bbda2e3318c3965b3b715ea1e95a4f75b1d66f", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.21
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v1.0.41
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.116
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]     Checking ppv-lite86 v0.2.9
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]    Compiling anyhow v1.0.32
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking streaming-iterator v0.1.5
[INFO] [stderr]     Checking fixedbitset v0.3.1
[INFO] [stderr]     Checking matrixmultiply v0.2.3
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking generic-array v0.13.2
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]     Checking simba v0.1.5
[INFO] [stderr]     Checking rand_distr v0.2.2
[INFO] [stderr]     Checking nalgebra v0.21.1
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]     Checking aries_collections v0.1.0 (https://github.com/arthur-bit-monnot/aries#73ab9100)
[INFO] [stderr]     Checking aries_planning v0.1.0 (https://github.com/arthur-bit-monnot/aries#73ab9100)
[INFO] [stderr]     Checking explain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/cause.rs:373:27
[INFO] [stdout]     |
[INFO] [stdout] 373 |                 for su in support {
[INFO] [stdout]     |                           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 373 -                 for su in support {
[INFO] [stdout] 373 +                 while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 373 -                 for su in support {
[INFO] [stdout] 373 +                 if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/cause.rs:384:27
[INFO] [stdout]     |
[INFO] [stdout] 384 |                 for su in support2 {
[INFO] [stdout]     |                           ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 384 -                 for su in support2 {
[INFO] [stdout] 384 +                 while let Some(su) = support2 {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 384 -                 for su in support2 {
[INFO] [stdout] 384 +                 if let Some(su) = support2 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/cause.rs:402:47
[INFO] [stdout]     |
[INFO] [stdout] 402 | ...                   for su in support {
[INFO] [stdout]     |                                 ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 402 -                                     for su in support {
[INFO] [stdout] 402 +                                     while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 402 -                                     for su in support {
[INFO] [stdout] 402 +                                     if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/centralite.rs:210:18
[INFO] [stdout]     |
[INFO] [stdout] 210 |         for d in val.get(&i) {
[INFO] [stdout]     |                  ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 210 -         for d in val.get(&i) {
[INFO] [stdout] 210 +         while let Some(d) = val.get(&i) {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 210 -         for d in val.get(&i) {
[INFO] [stdout] 210 +         if let Some(d) = val.get(&i) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/explain/explain.rs:467:25
[INFO] [stdout]     |
[INFO] [stdout] 467 |                         std::mem::replace(&mut newout[count], ic.clone());
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 467 |                         let _ = std::mem::replace(&mut newout[count], ic.clone());
[INFO] [stdout]     |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/explain.rs:596:27
[INFO] [stdout]     |
[INFO] [stdout] 596 |                 for su in support {
[INFO] [stdout]     |                           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 596 -                 for su in support {
[INFO] [stdout] 596 +                 while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 596 -                 for su in support {
[INFO] [stdout] 596 +                 if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/explain.rs:651:27
[INFO] [stdout]     |
[INFO] [stdout] 651 |                 for su in support {
[INFO] [stdout]     |                           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 651 -                 for su in support {
[INFO] [stdout] 651 +                 while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 651 -                 for su in support {
[INFO] [stdout] 651 +                 if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/explain.rs:673:47
[INFO] [stdout]     |
[INFO] [stdout] 673 | ...                   for su in support {
[INFO] [stdout]     |                                 ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 673 -                                     for su in support {
[INFO] [stdout] 673 +                                     while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 673 -                                     for su in support {
[INFO] [stdout] 673 +                                     if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1128:26
[INFO] [stdout]      |
[INFO] [stdout] 1128 |                 for i in t.chemin() {
[INFO] [stdout]      |                          ^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1128 -                 for i in t.chemin() {
[INFO] [stdout] 1128 +                 while let Some(i) = t.chemin() {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1128 -                 for i in t.chemin() {
[INFO] [stdout] 1128 +                 if let Some(i) = t.chemin() {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1180:27
[INFO] [stdout]      |
[INFO] [stdout] 1180 |                 for su in support {
[INFO] [stdout]      |                           ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1180 -                 for su in support {
[INFO] [stdout] 1180 +                 while let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1180 -                 for su in support {
[INFO] [stdout] 1180 +                 if let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1205:47
[INFO] [stdout]      |
[INFO] [stdout] 1205 | ...                   for su in support {
[INFO] [stdout]      |                                 ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1205 -                                     for su in support {
[INFO] [stdout] 1205 +                                     while let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1205 -                                     for su in support {
[INFO] [stdout] 1205 +                                     if let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1304:27
[INFO] [stdout]      |
[INFO] [stdout] 1304 |                 for su in support {
[INFO] [stdout]      |                           ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1304 -                 for su in support {
[INFO] [stdout] 1304 +                 while let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1304 -                 for su in support {
[INFO] [stdout] 1304 +                 if let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1313:27
[INFO] [stdout]      |
[INFO] [stdout] 1313 |                 for su in support2 {
[INFO] [stdout]      |                           ^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1313 -                 for su in support2 {
[INFO] [stdout] 1313 +                 while let Some(su) = support2 {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1313 -                 for su in support2 {
[INFO] [stdout] 1313 +                 if let Some(su) = support2 {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1331:47
[INFO] [stdout]      |
[INFO] [stdout] 1331 | ...                   for su in support {
[INFO] [stdout]      |                                 ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1331 -                                     for su in support {
[INFO] [stdout] 1331 +                                     while let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1331 -                                     for su in support {
[INFO] [stdout] 1331 +                                     if let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/question.rs:812:18
[INFO] [stdout]     |
[INFO] [stdout] 812 |         for i in n {
[INFO] [stdout]     |                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 812 -         for i in n {
[INFO] [stdout] 812 +         while let Some(i) = n {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 812 -         for i in n {
[INFO] [stdout] 812 +         if let Some(i) = n {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/state2.rs:299:22
[INFO] [stdout]     |
[INFO] [stdout] 299 |             for n in chemin {
[INFO] [stdout]     |                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 299 -             for n in chemin {
[INFO] [stdout] 299 +             while let Some(n) = chemin {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 299 -             for n in chemin {
[INFO] [stdout] 299 +             if let Some(n) = chemin {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/cause.rs:373:27
[INFO] [stdout]     |
[INFO] [stdout] 373 |                 for su in support {
[INFO] [stdout]     |                           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 373 -                 for su in support {
[INFO] [stdout] 373 +                 while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 373 -                 for su in support {
[INFO] [stdout] 373 +                 if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/cause.rs:384:27
[INFO] [stdout]     |
[INFO] [stdout] 384 |                 for su in support2 {
[INFO] [stdout]     |                           ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 384 -                 for su in support2 {
[INFO] [stdout] 384 +                 while let Some(su) = support2 {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 384 -                 for su in support2 {
[INFO] [stdout] 384 +                 if let Some(su) = support2 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/cause.rs:402:47
[INFO] [stdout]     |
[INFO] [stdout] 402 | ...                   for su in support {
[INFO] [stdout]     |                                 ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 402 -                                     for su in support {
[INFO] [stdout] 402 +                                     while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 402 -                                     for su in support {
[INFO] [stdout] 402 +                                     if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/centralite.rs:210:18
[INFO] [stdout]     |
[INFO] [stdout] 210 |         for d in val.get(&i) {
[INFO] [stdout]     |                  ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 210 -         for d in val.get(&i) {
[INFO] [stdout] 210 +         while let Some(d) = val.get(&i) {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 210 -         for d in val.get(&i) {
[INFO] [stdout] 210 +         if let Some(d) = val.get(&i) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/explain/explain.rs:467:25
[INFO] [stdout]     |
[INFO] [stdout] 467 |                         std::mem::replace(&mut newout[count], ic.clone());
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 467 |                         let _ = std::mem::replace(&mut newout[count], ic.clone());
[INFO] [stdout]     |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/explain.rs:596:27
[INFO] [stdout]     |
[INFO] [stdout] 596 |                 for su in support {
[INFO] [stdout]     |                           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 596 -                 for su in support {
[INFO] [stdout] 596 +                 while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 596 -                 for su in support {
[INFO] [stdout] 596 +                 if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/explain.rs:651:27
[INFO] [stdout]     |
[INFO] [stdout] 651 |                 for su in support {
[INFO] [stdout]     |                           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 651 -                 for su in support {
[INFO] [stdout] 651 +                 while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 651 -                 for su in support {
[INFO] [stdout] 651 +                 if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/explain.rs:673:47
[INFO] [stdout]     |
[INFO] [stdout] 673 | ...                   for su in support {
[INFO] [stdout]     |                                 ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 673 -                                     for su in support {
[INFO] [stdout] 673 +                                     while let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 673 -                                     for su in support {
[INFO] [stdout] 673 +                                     if let Some(su) = support {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1128:26
[INFO] [stdout]      |
[INFO] [stdout] 1128 |                 for i in t.chemin() {
[INFO] [stdout]      |                          ^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1128 -                 for i in t.chemin() {
[INFO] [stdout] 1128 +                 while let Some(i) = t.chemin() {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1128 -                 for i in t.chemin() {
[INFO] [stdout] 1128 +                 if let Some(i) = t.chemin() {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1180:27
[INFO] [stdout]      |
[INFO] [stdout] 1180 |                 for su in support {
[INFO] [stdout]      |                           ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1180 -                 for su in support {
[INFO] [stdout] 1180 +                 while let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1180 -                 for su in support {
[INFO] [stdout] 1180 +                 if let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1205:47
[INFO] [stdout]      |
[INFO] [stdout] 1205 | ...                   for su in support {
[INFO] [stdout]      |                                 ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1205 -                                     for su in support {
[INFO] [stdout] 1205 +                                     while let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1205 -                                     for su in support {
[INFO] [stdout] 1205 +                                     if let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1304:27
[INFO] [stdout]      |
[INFO] [stdout] 1304 |                 for su in support {
[INFO] [stdout]      |                           ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1304 -                 for su in support {
[INFO] [stdout] 1304 +                 while let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1304 -                 for su in support {
[INFO] [stdout] 1304 +                 if let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1313:27
[INFO] [stdout]      |
[INFO] [stdout] 1313 |                 for su in support2 {
[INFO] [stdout]      |                           ^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1313 -                 for su in support2 {
[INFO] [stdout] 1313 +                 while let Some(su) = support2 {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1313 -                 for su in support2 {
[INFO] [stdout] 1313 +                 if let Some(su) = support2 {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]     --> src/explain/explain.rs:1331:47
[INFO] [stdout]      |
[INFO] [stdout] 1331 | ...                   for su in support {
[INFO] [stdout]      |                                 ^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]      |
[INFO] [stdout] 1331 -                                     for su in support {
[INFO] [stdout] 1331 +                                     while let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]      |
[INFO] [stdout] 1331 -                                     for su in support {
[INFO] [stdout] 1331 +                                     if let Some(su) = support {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/question.rs:812:18
[INFO] [stdout]     |
[INFO] [stdout] 812 |         for i in n {
[INFO] [stdout]     |                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 812 -         for i in n {
[INFO] [stdout] 812 +         while let Some(i) = n {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 812 -         for i in n {
[INFO] [stdout] 812 +         if let Some(i) = n {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/explain/state2.rs:299:22
[INFO] [stdout]     |
[INFO] [stdout] 299 |             for n in chemin {
[INFO] [stdout]     |                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 299 -             for n in chemin {
[INFO] [stdout] 299 +             while let Some(n) = chemin {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 299 -             for n in chemin {
[INFO] [stdout] 299 +             if let Some(n) = chemin {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug, StructOpt)]
[INFO] [stdout]    |                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `StructOpt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `explain` (bin "explain" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug, StructOpt)]
[INFO] [stdout]    |                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the derive macro `StructOpt` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `explain` (bin "explain") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "df998c1026d903827bb42456d7bbda2e3318c3965b3b715ea1e95a4f75b1d66f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df998c1026d903827bb42456d7bbda2e3318c3965b3b715ea1e95a4f75b1d66f", kill_on_drop: false }`
[INFO] [stdout] df998c1026d903827bb42456d7bbda2e3318c3965b3b715ea1e95a4f75b1d66f