[INFO] cloning repository https://github.com/gress2/rlox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gress2/rlox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgress2%2Frlox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgress2%2Frlox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8e91c50472d7252645658823a1068b3dad2adb8e
[INFO] checking gress2/rlox against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgress2%2Frlox" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gress2/rlox on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gress2/rlox
[INFO] finished tweaking git repo https://github.com/gress2/rlox
[INFO] tweaked toml for git repo https://github.com/gress2/rlox written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/gress2/rlox already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2f785eafaa51a65e60afcc64ddaa9213cc5bb0fc4ffa47fadea974d161c368a2
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2f785eafaa51a65e60afcc64ddaa9213cc5bb0fc4ffa47fadea974d161c368a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2f785eafaa51a65e60afcc64ddaa9213cc5bb0fc4ffa47fadea974d161c368a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f785eafaa51a65e60afcc64ddaa9213cc5bb0fc4ffa47fadea974d161c368a2", kill_on_drop: false }`
[INFO] [stdout] 2f785eafaa51a65e60afcc64ddaa9213cc5bb0fc4ffa47fadea974d161c368a2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 924e50bde9561adf17262a4e2a6e10b9809cdb633fcf95ed70cd50f88526751b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "924e50bde9561adf17262a4e2a6e10b9809cdb633fcf95ed70cd50f88526751b", kill_on_drop: false }`
[INFO] [stderr]     Checking rlox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `line`
[INFO] [stdout]  --> src/main.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stdout]   |           ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loc`
[INFO] [stdout]  --> src/main.rs:9:21
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stdout]   |                     ^^^ help: if this is intentional, prefix it with an underscore: `_loc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `message`
[INFO] [stdout]  --> src/main.rs:9:34
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stdout]   |                                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line`
[INFO] [stdout]   --> src/main.rs:13:10
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn error(line: i8, message: String) -> () {
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `message`
[INFO] [stdout]   --> src/main.rs:13:20
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn error(line: i8, message: String) -> () {
[INFO] [stdout]    |                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tokens`
[INFO] [stdout]   --> src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let tokens = scanner::scan_tokens(source);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tokens`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `had_error`
[INFO] [stdout]   --> src/main.rs:17:24
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn run(source: String, had_error: &bool) -> () {
[INFO] [stdout]    |                        ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_had_error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start_iter`
[INFO] [stdout]  --> src/scanner.rs:8:47
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn build_token(type_ : TokenType, line : &i8, start_iter : &Peekable<Chars>, end_iter : &Peekable<Chars>) -> Token {
[INFO] [stdout]   |                                               ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_start_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end_iter`
[INFO] [stdout]  --> src/scanner.rs:8:78
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn build_token(type_ : TokenType, line : &i8, start_iter : &Peekable<Chars>, end_iter : &Peekable<Chars>) -> Token {
[INFO] [stdout]   |                                                                              ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_end_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `src_len`
[INFO] [stdout]    --> src/scanner.rs:238:9
[INFO] [stdout]     |
[INFO] [stdout] 238 |     let src_len = source.len();
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_src_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line`
[INFO] [stdout]  --> src/main.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stdout]   |           ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loc`
[INFO] [stdout]  --> src/main.rs:9:21
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stdout]   |                     ^^^ help: if this is intentional, prefix it with an underscore: `_loc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `message`
[INFO] [stdout]  --> src/main.rs:9:34
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stdout]   |                                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line`
[INFO] [stdout]   --> src/main.rs:13:10
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn error(line: i8, message: String) -> () {
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `message`
[INFO] [stdout]   --> src/main.rs:13:20
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn error(line: i8, message: String) -> () {
[INFO] [stdout]    |                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tokens`
[INFO] [stdout]   --> src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let tokens = scanner::scan_tokens(source);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tokens`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `had_error`
[INFO] [stdout]   --> src/main.rs:17:24
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn run(source: String, had_error: &bool) -> () {
[INFO] [stdout]    |                        ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_had_error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start_iter`
[INFO] [stdout]  --> src/scanner.rs:8:47
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn build_token(type_ : TokenType, line : &i8, start_iter : &Peekable<Chars>, end_iter : &Peekable<Chars>) -> Token {
[INFO] [stdout]   |                                               ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_start_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end_iter`
[INFO] [stdout]  --> src/scanner.rs:8:78
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn build_token(type_ : TokenType, line : &i8, start_iter : &Peekable<Chars>, end_iter : &Peekable<Chars>) -> Token {
[INFO] [stdout]   |                                                                              ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_end_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `src_len`
[INFO] [stdout]    --> src/scanner.rs:238:9
[INFO] [stdout]     |
[INFO] [stdout] 238 |     let src_len = source.len();
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_src_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:141:11
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 141 |     match char_iter.next() {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 231 |         None => return tokenize(TokenType::Eof)
[INFO] [stdout]     |                        -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:154:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 154 |                 if next_matches('=', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 157 |                     return tokenize(TokenType::Bang);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:161:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 161 |                 if next_matches('=', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 164 |                     return tokenize(TokenType::Equal);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:168:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 168 |                 if next_matches('=', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 171 |                     return tokenize(TokenType::Less);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:175:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 175 |                 if next_matches('=', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 178 |                     return tokenize(TokenType::Greater);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:182:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 182 |                 if next_matches('/', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 186 |                     return tokenize(TokenType::Slash);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:183:37
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 183 |                     consume_comment(&mut char_iter, &mut line);
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 184 |                     return tokenize(TokenType::Null);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `line` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:183:53
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                          ---- first borrow occurs due to use of `line` in closure
[INFO] [stdout] ...
[INFO] [stdout] 183 |                     consume_comment(&mut char_iter, &mut line);
[INFO] [stdout]     |                                                     ^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 184 |                     return tokenize(TokenType::Null);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0506]: cannot assign to `*line` because it is borrowed
[INFO] [stdout]    --> src/scanner.rs:193:17
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- borrow of `*line` occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                          ---- borrow occurs due to use in closure
[INFO] [stdout] ...
[INFO] [stdout] 193 |                 *line += 1;
[INFO] [stdout]     |                 ^^^^^^^^^^ assignment to borrowed `*line` occurs here
[INFO] [stdout] 194 |                 return tokenize(TokenType::Null);
[INFO] [stdout]     |                        -------- borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:205:56
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 205 |                     let s : String = get_identifier(c, &mut char_iter);
[INFO] [stdout]     |                                                        ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 208 |                         "and" => return tokenize(TokenType::And),
[INFO] [stdout]     |                                         -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 10 previous errors; 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0502, E0506.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:141:11
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 141 |     match char_iter.next() {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 231 |         None => return tokenize(TokenType::Eof)
[INFO] [stdout]     |                        -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rlox` due to 11 previous errors; 10 warnings emitted
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:154:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 154 |                 if next_matches('=', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 157 |                     return tokenize(TokenType::Bang);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:161:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 161 |                 if next_matches('=', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 164 |                     return tokenize(TokenType::Equal);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:168:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 168 |                 if next_matches('=', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 171 |                     return tokenize(TokenType::Less);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:175:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 175 |                 if next_matches('=', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 178 |                     return tokenize(TokenType::Greater);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:182:38
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 182 |                 if next_matches('/', &mut char_iter) {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 186 |                     return tokenize(TokenType::Slash);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:183:37
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 183 |                     consume_comment(&mut char_iter, &mut line);
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 184 |                     return tokenize(TokenType::Null);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `line` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:183:53
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                          ---- first borrow occurs due to use of `line` in closure
[INFO] [stdout] ...
[INFO] [stdout] 183 |                     consume_comment(&mut char_iter, &mut line);
[INFO] [stdout]     |                                                     ^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 184 |                     return tokenize(TokenType::Null);
[INFO] [stdout]     |                            -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0506]: cannot assign to `*line` because it is borrowed
[INFO] [stdout]    --> src/scanner.rs:193:17
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- borrow of `*line` occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                          ---- borrow occurs due to use in closure
[INFO] [stdout] ...
[INFO] [stdout] 193 |                 *line += 1;
[INFO] [stdout]     |                 ^^^^^^^^^^ assignment to borrowed `*line` occurs here
[INFO] [stdout] 194 |                 return tokenize(TokenType::Null);
[INFO] [stdout]     |                        -------- borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/scanner.rs:205:56
[INFO] [stdout]     |
[INFO] [stdout] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stdout]     |                    -------------------------- immutable borrow occurs here
[INFO] [stdout] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stdout]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stdout] ...
[INFO] [stdout] 205 |                     let s : String = get_identifier(c, &mut char_iter);
[INFO] [stdout]     |                                                        ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 208 |                         "and" => return tokenize(TokenType::And),
[INFO] [stdout]     |                                         -------- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 10 previous errors; 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0502, E0506.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "924e50bde9561adf17262a4e2a6e10b9809cdb633fcf95ed70cd50f88526751b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "924e50bde9561adf17262a4e2a6e10b9809cdb633fcf95ed70cd50f88526751b", kill_on_drop: false }`
[INFO] [stdout] 924e50bde9561adf17262a4e2a6e10b9809cdb633fcf95ed70cd50f88526751b