[INFO] updating cached repository https://github.com/iptq/pgen
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] aa18f06d1c0373506b68cd251d70d82eb1be7f35
[INFO] checking iptq/pgen against master#73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de for pr-68325
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiptq%2Fpgen" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iptq/pgen on toolchain 73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de
[INFO] running `"/workspace/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/iptq/pgen
[INFO] removed workspace from git repo https://github.com/iptq/pgen
[INFO] finished tweaking git repo https://github.com/iptq/pgen
[INFO] tweaked toml for git repo https://github.com/iptq/pgen written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/iptq/pgen already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 016eac52ad1439f108f5fdfaea8c7f9eee61f1bce45778bf7b75546bc61cb5a1
[INFO] running `"docker" "start" "-a" "016eac52ad1439f108f5fdfaea8c7f9eee61f1bce45778bf7b75546bc61cb5a1"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling syn v1.0.12
[INFO] [stderr]     Checking encode_unicode v0.3.6
[INFO] [stderr]     Checking regex-syntax v0.6.12
[INFO] [stderr]    Compiling proc-macro2 v1.0.7
[INFO] [stderr]     Checking regex-automata v0.1.8
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking term v0.5.2
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking csv-core v0.1.6
[INFO] [stderr]     Checking bstr v0.2.8
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking csv v1.1.1
[INFO] [stderr]     Checking prettytable-rs v0.8.0
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.9
[INFO] [stderr]     Checking thiserror v1.0.9
[INFO] [stderr]     Checking pgen v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `HashSet`
[INFO] [stderr]  --> src/grammar.rs:1:53
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
[INFO] [stderr]   |                                                     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `HashSet`
[INFO] [stderr]  --> src/grammar.rs:1:53
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
[INFO] [stderr]   |                                                     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Cell`, `Row`
[INFO] [stderr]  --> src/parser.rs:1:19
[INFO] [stderr]   |
[INFO] [stderr] 1 | use prettytable::{Cell, Row, Table};
[INFO] [stderr]   |                   ^^^^  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::grammar::Production`
[INFO] [stderr]  --> src/parser.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use crate::grammar::Production;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Cell`, `Row`
[INFO] [stderr]  --> src/parser.rs:1:19
[INFO] [stderr]   |
[INFO] [stderr] 1 | use prettytable::{Cell, Row, Table};
[INFO] [stderr]   |                   ^^^^  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::grammar::Production`
[INFO] [stderr]  --> src/parser.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use crate::grammar::Production;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]  --> src/grammar.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `items`
[INFO] [stderr]   --> src/grammar.rs:47:13
[INFO] [stderr]    |
[INFO] [stderr] 47 |         let items = {
[INFO] [stderr]    |             ^^^^^ help: consider prefixing with an underscore: `_items`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/grammar.rs:381:14
[INFO] [stderr]     |
[INFO] [stderr] 381 |         for (i, item_set) in self.canonical_collection.iter().enumerate() {
[INFO] [stderr]     |              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/parser.rs:66:14
[INFO] [stderr]    |
[INFO] [stderr] 66 |         for (i, (action, _)) in self.table_iter() {
[INFO] [stderr]    |              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/parser.rs:81:14
[INFO] [stderr]    |
[INFO] [stderr] 81 |         for (i, (_, goto)) in self.table_iter() {
[INFO] [stderr]    |              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/grammar.rs:304:37
[INFO] [stderr]     |
[INFO] [stderr] 304 |                         if let Some(mut follow_set) = self.follow_sets.get_mut(&B) {
[INFO] [stderr]     |                                     ----^^^^^^^^^^
[INFO] [stderr]     |                                     |
[INFO] [stderr]     |                                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/grammar.rs:318:37
[INFO] [stderr]     |
[INFO] [stderr] 318 |                         if let Some(mut follow_set) = self.follow_sets.get_mut(&B) {
[INFO] [stderr]     |                                     ----^^^^^^^^^^
[INFO] [stderr]     |                                     |
[INFO] [stderr]     |                                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/grammar.rs:334:41
[INFO] [stderr]     |
[INFO] [stderr] 334 | ...                   if let Some(mut follow_set) = self.follow_sets.get_mut(&B) {
[INFO] [stderr]     |                                   ----^^^^^^^^^^
[INFO] [stderr]     |                                   |
[INFO] [stderr]     |                                   help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]  --> src/grammar.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `items`
[INFO] [stderr]   --> src/grammar.rs:47:13
[INFO] [stderr]    |
[INFO] [stderr] 47 |         let items = {
[INFO] [stderr]    |             ^^^^^ help: consider prefixing with an underscore: `_items`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/grammar.rs:381:14
[INFO] [stderr]     |
[INFO] [stderr] 381 |         for (i, item_set) in self.canonical_collection.iter().enumerate() {
[INFO] [stderr]     |              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `B` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:300:29
[INFO] [stderr]     |
[INFO] [stderr] 300 |                         let B = &symbol_list[symbol_list.len() - 2];
[INFO] [stderr]     |                             ^ help: convert the identifier to snake case: `b`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `B` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:314:29
[INFO] [stderr]     |
[INFO] [stderr] 314 |                         let B = &symbol_list[symbol_list.len() - 1];
[INFO] [stderr]     |                             ^ help: convert the identifier to snake case: `b`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `B` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:329:29
[INFO] [stderr]     |
[INFO] [stderr] 329 |                         let B = &symbol_list[symbol_list.len() - 2];
[INFO] [stderr]     |                             ^ help: convert the identifier to snake case: `b`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:356:21
[INFO] [stderr]     |
[INFO] [stderr] 356 |                 for X in self.grammar_symbols.values() {
[INFO] [stderr]     |                     ^ help: convert the identifier to snake case (notice the capitalization): `x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:416:49
[INFO] [stderr]     |
[INFO] [stderr] 416 |     fn goto(&self, item_set: BTreeSet<LR0Item>, X: Symbol) -> BTreeSet<LR0Item> {
[INFO] [stderr]     |                                                 ^ help: convert the identifier to snake case (notice the capitalization): `x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/parser.rs:66:14
[INFO] [stderr]    |
[INFO] [stderr] 66 |         for (i, (action, _)) in self.table_iter() {
[INFO] [stderr]    |              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/parser.rs:81:14
[INFO] [stderr]    |
[INFO] [stderr] 81 |         for (i, (_, goto)) in self.table_iter() {
[INFO] [stderr]    |              ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/grammar.rs:304:37
[INFO] [stderr]     |
[INFO] [stderr] 304 |                         if let Some(mut follow_set) = self.follow_sets.get_mut(&B) {
[INFO] [stderr]     |                                     ----^^^^^^^^^^
[INFO] [stderr]     |                                     |
[INFO] [stderr]     |                                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/grammar.rs:318:37
[INFO] [stderr]     |
[INFO] [stderr] 318 |                         if let Some(mut follow_set) = self.follow_sets.get_mut(&B) {
[INFO] [stderr]     |                                     ----^^^^^^^^^^
[INFO] [stderr]     |                                     |
[INFO] [stderr]     |                                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/grammar.rs:334:41
[INFO] [stderr]     |
[INFO] [stderr] 334 | ...                   if let Some(mut follow_set) = self.follow_sets.get_mut(&B) {
[INFO] [stderr]     |                                   ----^^^^^^^^^^
[INFO] [stderr]     |                                   |
[INFO] [stderr]     |                                   help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `B` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:300:29
[INFO] [stderr]     |
[INFO] [stderr] 300 |                         let B = &symbol_list[symbol_list.len() - 2];
[INFO] [stderr]     |                             ^ help: convert the identifier to snake case: `b`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `B` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:314:29
[INFO] [stderr]     |
[INFO] [stderr] 314 |                         let B = &symbol_list[symbol_list.len() - 1];
[INFO] [stderr]     |                             ^ help: convert the identifier to snake case: `b`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `B` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:329:29
[INFO] [stderr]     |
[INFO] [stderr] 329 |                         let B = &symbol_list[symbol_list.len() - 2];
[INFO] [stderr]     |                             ^ help: convert the identifier to snake case: `b`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:356:21
[INFO] [stderr]     |
[INFO] [stderr] 356 |                 for X in self.grammar_symbols.values() {
[INFO] [stderr]     |                     ^ help: convert the identifier to snake case (notice the capitalization): `x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X` should have a snake case name
[INFO] [stderr]    --> src/grammar.rs:416:49
[INFO] [stderr]     |
[INFO] [stderr] 416 |     fn goto(&self, item_set: BTreeSet<LR0Item>, X: Symbol) -> BTreeSet<LR0Item> {
[INFO] [stderr]     |                                                 ^ help: convert the identifier to snake case (notice the capitalization): `x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pgen::Grammar`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use pgen::Grammar;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pgen::Parser`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use pgen::Parser;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pgen::Grammar`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use pgen::Grammar;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pgen::Parser`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use pgen::Parser;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     parser.codegen(file);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     parser.codegen(file);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.90s
[INFO] running `"docker" "inspect" "016eac52ad1439f108f5fdfaea8c7f9eee61f1bce45778bf7b75546bc61cb5a1"`
[INFO] running `"docker" "rm" "-f" "016eac52ad1439f108f5fdfaea8c7f9eee61f1bce45778bf7b75546bc61cb5a1"`
[INFO] [stdout] 016eac52ad1439f108f5fdfaea8c7f9eee61f1bce45778bf7b75546bc61cb5a1