[INFO] fetching crate udl 0.3.1...
[INFO] checking udl-0.3.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate udl 0.3.1 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate udl 0.3.1 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate udl 0.3.1
[INFO] finished tweaking crates.io crate udl 0.3.1
[INFO] tweaked toml for crates.io crate udl 0.3.1 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate udl 0.3.1 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 18a3cafc69fa6869bdf4ad2da101ad5b9172fef36648441ddb37b747402465c9
[INFO] running `Command { std: "docker" "start" "-a" "18a3cafc69fa6869bdf4ad2da101ad5b9172fef36648441ddb37b747402465c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18a3cafc69fa6869bdf4ad2da101ad5b9172fef36648441ddb37b747402465c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18a3cafc69fa6869bdf4ad2da101ad5b9172fef36648441ddb37b747402465c9", kill_on_drop: false }`
[INFO] [stdout] 18a3cafc69fa6869bdf4ad2da101ad5b9172fef36648441ddb37b747402465c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] db8e8ca897daa8af718987a659829193e923d2e3f00cf33bab5585237192529e
[INFO] running `Command { std: "docker" "start" "-a" "db8e8ca897daa8af718987a659829193e923d2e3f00cf33bab5585237192529e", kill_on_drop: false }`
[INFO] [stderr]     Checking udl v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Display`
[INFO] [stdout]  --> src/parse.rs:8:23
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::fmt::{Debug, Display, Formatter};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Display`
[INFO] [stdout]  --> src/parse.rs:8:23
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::fmt::{Debug, Display, Formatter};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]    --> src/parse.rs:404:25
[INFO] [stdout]     |
[INFO] [stdout] 404 |             Token::Word(p, k) | Token::Quote(p, k) => k.clone(),
[INFO] [stdout]     |                         ^                    ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 404 |             Token::Word(_p, k) | Token::Quote(_p, k) => k.clone(),
[INFO] [stdout]     |                         ~~                    ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]    --> src/parse.rs:541:25
[INFO] [stdout]     |
[INFO] [stdout] 541 |             Token::Word(p, k) | Token::Quote(p, k) => k.clone(),
[INFO] [stdout]     |                         ^                    ^
[INFO] [stdout]     |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 541 |             Token::Word(_p, k) | Token::Quote(_p, k) => k.clone(),
[INFO] [stdout]     |                         ~~                    ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `at`
[INFO] [stdout]    --> src/parse.rs:644:25
[INFO] [stdout]     |
[INFO] [stdout] 644 |             Token::Word(at, w) | Token::Quote(at, w) => {
[INFO] [stdout]     |                         ^^                    ^^
[INFO] [stdout]     |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 644 |             Token::Word(_at, w) | Token::Quote(_at, w) => {
[INFO] [stdout]     |                         ~~~                    ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]    --> src/parse.rs:404:25
[INFO] [stdout]     |
[INFO] [stdout] 404 |             Token::Word(p, k) | Token::Quote(p, k) => k.clone(),
[INFO] [stdout]     |                         ^                    ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 404 |             Token::Word(_p, k) | Token::Quote(_p, k) => k.clone(),
[INFO] [stdout]     |                         ~~                    ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]    --> src/parse.rs:541:25
[INFO] [stdout]     |
[INFO] [stdout] 541 |             Token::Word(p, k) | Token::Quote(p, k) => k.clone(),
[INFO] [stdout]     |                         ^                    ^
[INFO] [stdout]     |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 541 |             Token::Word(_p, k) | Token::Quote(_p, k) => k.clone(),
[INFO] [stdout]     |                         ~~                    ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `at`
[INFO] [stdout]    --> src/parse.rs:644:25
[INFO] [stdout]     |
[INFO] [stdout] 644 |             Token::Word(at, w) | Token::Quote(at, w) => {
[INFO] [stdout]     |                         ^^                    ^^
[INFO] [stdout]     |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 644 |             Token::Word(_at, w) | Token::Quote(_at, w) => {
[INFO] [stdout]     |                         ~~~                    ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `put_char_at` is never used
[INFO] [stdout]   --> src/lex.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | impl <'a> CharIter<'a> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 93 |     fn put_char_at(&mut self, char: char, at: Position) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `tokens` and `procstr` are never read
[INFO] [stdout]    --> src/lex.rs:152:5
[INFO] [stdout]     |
[INFO] [stdout] 151 | pub struct LexedStr {
[INFO] [stdout]     |            -------- fields in this struct
[INFO] [stdout] 152 |     tokens: Vec<Token>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 153 |     procstr: String,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Text` is never used
[INFO] [stdout]  --> src/common.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | trait Text {
[INFO] [stdout]   |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `as_str`, `as_u64`, `as_f64`, and `as_bool` are never used
[INFO] [stdout]   --> src/common.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl dyn Text {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 10 |     pub fn as_str(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub fn as_u64(&mut self) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn as_f64(&mut self) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn as_bool() {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Sequence` is never used
[INFO] [stdout]   --> src/common.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 | trait Sequence {
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Dictionary` is never used
[INFO] [stdout]   --> src/common.rs:30:7
[INFO] [stdout]    |
[INFO] [stdout] 30 | trait Dictionary {
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Compound` is never used
[INFO] [stdout]   --> src/common.rs:35:7
[INFO] [stdout]    |
[INFO] [stdout] 35 | trait Compound {
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Command` is never used
[INFO] [stdout]   --> src/common.rs:40:7
[INFO] [stdout]    |
[INFO] [stdout] 40 | trait Command {
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `put_char_at` is never used
[INFO] [stdout]   --> src/lex.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | impl <'a> CharIter<'a> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 93 |     fn put_char_at(&mut self, char: char, at: Position) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `tokens` and `procstr` are never read
[INFO] [stdout]    --> src/lex.rs:152:5
[INFO] [stdout]     |
[INFO] [stdout] 151 | pub struct LexedStr {
[INFO] [stdout]     |            -------- fields in this struct
[INFO] [stdout] 152 |     tokens: Vec<Token>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 153 |     procstr: String,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Text` is never used
[INFO] [stdout]  --> src/common.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | trait Text {
[INFO] [stdout]   |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `as_str`, `as_u64`, `as_f64`, and `as_bool` are never used
[INFO] [stdout]   --> src/common.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl dyn Text {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 10 |     pub fn as_str(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub fn as_u64(&mut self) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn as_f64(&mut self) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn as_bool() {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Sequence` is never used
[INFO] [stdout]   --> src/common.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 | trait Sequence {
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Dictionary` is never used
[INFO] [stdout]   --> src/common.rs:30:7
[INFO] [stdout]    |
[INFO] [stdout] 30 | trait Dictionary {
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Compound` is never used
[INFO] [stdout]   --> src/common.rs:35:7
[INFO] [stdout]    |
[INFO] [stdout] 35 | trait Compound {
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Command` is never used
[INFO] [stdout]   --> src/common.rs:40:7
[INFO] [stdout]    |
[INFO] [stdout] 40 | trait Command {
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `CharIter`, `Token`
[INFO] [stdout]  --> tests/test.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use udl::lex::{CharIter, Token};
[INFO] [stdout]   |                ^^^^^^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `source`
[INFO] [stdout]   --> tests/test.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let source = "{ A text argument }";
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_source`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.40s
[INFO] running `Command { std: "docker" "inspect" "db8e8ca897daa8af718987a659829193e923d2e3f00cf33bab5585237192529e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db8e8ca897daa8af718987a659829193e923d2e3f00cf33bab5585237192529e", kill_on_drop: false }`
[INFO] [stdout] db8e8ca897daa8af718987a659829193e923d2e3f00cf33bab5585237192529e