[INFO] updating cached repository https://github.com/gress2/rlox
[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] 8e91c50472d7252645658823a1068b3dad2adb8e
[INFO] checking gress2/rlox against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgress2%2Frlox" "/workspace/builds/worker-8/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gress2/rlox on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-8/source/Cargo.toml
[INFO] crate git repo https://github.com/gress2/rlox already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "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] 66d3f1e2a01cffa5df3d6634739172d2316c3e77b119b1576709b01bca49ffe8
[INFO] running `"docker" "start" "-a" "66d3f1e2a01cffa5df3d6634739172d2316c3e77b119b1576709b01bca49ffe8"`
[INFO] [stderr]     Checking rlox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `line`
[INFO] [stderr]  --> src/main.rs:9:11
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stderr]   |           ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]  --> src/main.rs:9:21
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stderr]   |                     ^^^ help: if this is intentional, prefix it with an underscore: `_loc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `message`
[INFO] [stderr]  --> src/main.rs:9:34
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stderr]   |                                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `line`
[INFO] [stderr]   --> src/main.rs:13:10
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn error(line: i8, message: String) -> () {
[INFO] [stderr]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `message`
[INFO] [stderr]   --> src/main.rs:13:20
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn error(line: i8, message: String) -> () {
[INFO] [stderr]    |                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tokens`
[INFO] [stderr]   --> src/main.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let tokens = scanner::scan_tokens(source);
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tokens`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `had_error`
[INFO] [stderr]   --> src/main.rs:17:24
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn run(source: String, had_error: &bool) -> () {
[INFO] [stderr]    |                        ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_had_error`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `start_iter`
[INFO] [stderr]  --> src/scanner.rs:8:47
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn build_token(type_ : TokenType, line : &i8, start_iter : &Peekable<Chars>, end_iter : &Peekable<Chars>) -> Token {
[INFO] [stderr]   |                                               ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_start_iter`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `end_iter`
[INFO] [stderr]  --> src/scanner.rs:8:78
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn build_token(type_ : TokenType, line : &i8, start_iter : &Peekable<Chars>, end_iter : &Peekable<Chars>) -> Token {
[INFO] [stderr]   |                                                                              ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_end_iter`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `src_len`
[INFO] [stderr]    --> src/scanner.rs:238:9
[INFO] [stderr]     |
[INFO] [stderr] 238 |     let src_len = source.len();
[INFO] [stderr]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_src_len`
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `*char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:141:11
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 141 |     match char_iter.next() {
[INFO] [stderr]     |           ^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 231 |         None => return tokenize(TokenType::Eof)
[INFO] [stderr]     |                        -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:154:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 154 |                 if next_matches('=', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 157 |                     return tokenize(TokenType::Bang);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:161:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 161 |                 if next_matches('=', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 164 |                     return tokenize(TokenType::Equal);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:168:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 168 |                 if next_matches('=', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 171 |                     return tokenize(TokenType::Less);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:175:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 175 |                 if next_matches('=', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 178 |                     return tokenize(TokenType::Greater);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:182:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 182 |                 if next_matches('/', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 186 |                     return tokenize(TokenType::Slash);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:183:37
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 183 |                     consume_comment(&mut char_iter, &mut line);
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] 184 |                     return tokenize(TokenType::Null);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `line` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:183:53
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                          ---- first borrow occurs due to use of `line` in closure
[INFO] [stderr] ...
[INFO] [stderr] 183 |                     consume_comment(&mut char_iter, &mut line);
[INFO] [stderr]     |                                                     ^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] 184 |                     return tokenize(TokenType::Null);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0506]: cannot assign to `*line` because it is borrowed
[INFO] [stderr]    --> src/scanner.rs:193:17
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- borrow of `*line` occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                          ---- borrow occurs due to use in closure
[INFO] [stderr] ...
[INFO] [stderr] 193 |                 *line += 1;
[INFO] [stderr]     |                 ^^^^^^^^^^ assignment to borrowed `*line` occurs here
[INFO] [stderr] 194 |                 return tokenize(TokenType::Null);
[INFO] [stderr]     |                        -------- borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:205:56
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 205 |                     let s : String = get_identifier(c, &mut char_iter);
[INFO] [stderr]     |                                                        ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 208 |                         "and" => return tokenize(TokenType::And),
[INFO] [stderr]     |                                         -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 10 previous errors; 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0502, E0506.
[INFO] [stderr] For more information about an error, try `rustc --explain E0502`.
[INFO] [stderr] error: could not compile `rlox`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused variable: `line`
[INFO] [stderr]  --> src/main.rs:9:11
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stderr]   |           ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]  --> src/main.rs:9:21
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stderr]   |                     ^^^ help: if this is intentional, prefix it with an underscore: `_loc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `message`
[INFO] [stderr]  --> src/main.rs:9:34
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn report(line: i8, loc: String, message: String) -> () {
[INFO] [stderr]   |                                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `line`
[INFO] [stderr]   --> src/main.rs:13:10
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn error(line: i8, message: String) -> () {
[INFO] [stderr]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `message`
[INFO] [stderr]   --> src/main.rs:13:20
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn error(line: i8, message: String) -> () {
[INFO] [stderr]    |                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tokens`
[INFO] [stderr]   --> src/main.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let tokens = scanner::scan_tokens(source);
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tokens`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `had_error`
[INFO] [stderr]   --> src/main.rs:17:24
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn run(source: String, had_error: &bool) -> () {
[INFO] [stderr]    |                        ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_had_error`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `start_iter`
[INFO] [stderr]  --> src/scanner.rs:8:47
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn build_token(type_ : TokenType, line : &i8, start_iter : &Peekable<Chars>, end_iter : &Peekable<Chars>) -> Token {
[INFO] [stderr]   |                                               ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_start_iter`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `end_iter`
[INFO] [stderr]  --> src/scanner.rs:8:78
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn build_token(type_ : TokenType, line : &i8, start_iter : &Peekable<Chars>, end_iter : &Peekable<Chars>) -> Token {
[INFO] [stderr]   |                                                                              ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_end_iter`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `src_len`
[INFO] [stderr]    --> src/scanner.rs:238:9
[INFO] [stderr]     |
[INFO] [stderr] 238 |     let src_len = source.len();
[INFO] [stderr]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_src_len`
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `*char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:141:11
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 141 |     match char_iter.next() {
[INFO] [stderr]     |           ^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 231 |         None => return tokenize(TokenType::Eof)
[INFO] [stderr]     |                        -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:154:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 154 |                 if next_matches('=', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 157 |                     return tokenize(TokenType::Bang);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:161:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 161 |                 if next_matches('=', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 164 |                     return tokenize(TokenType::Equal);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:168:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 168 |                 if next_matches('=', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 171 |                     return tokenize(TokenType::Less);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:175:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 175 |                 if next_matches('=', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 178 |                     return tokenize(TokenType::Greater);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:182:38
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 182 |                 if next_matches('/', &mut char_iter) {
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 186 |                     return tokenize(TokenType::Slash);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:183:37
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 183 |                     consume_comment(&mut char_iter, &mut line);
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] 184 |                     return tokenize(TokenType::Null);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `line` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:183:53
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                          ---- first borrow occurs due to use of `line` in closure
[INFO] [stderr] ...
[INFO] [stderr] 183 |                     consume_comment(&mut char_iter, &mut line);
[INFO] [stderr]     |                                                     ^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] 184 |                     return tokenize(TokenType::Null);
[INFO] [stderr]     |                            -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0506]: cannot assign to `*line` because it is borrowed
[INFO] [stderr]    --> src/scanner.rs:193:17
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- borrow of `*line` occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                          ---- borrow occurs due to use in closure
[INFO] [stderr] ...
[INFO] [stderr] 193 |                 *line += 1;
[INFO] [stderr]     |                 ^^^^^^^^^^ assignment to borrowed `*line` occurs here
[INFO] [stderr] 194 |                 return tokenize(TokenType::Null);
[INFO] [stderr]     |                        -------- borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `char_iter` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/scanner.rs:205:56
[INFO] [stderr]     |
[INFO] [stderr] 137 |     let tokenize = | ty: TokenType | -> Token {
[INFO] [stderr]     |                    -------------------------- immutable borrow occurs here
[INFO] [stderr] 138 |         build_token(ty, &line, &start_iter, &char_iter)
[INFO] [stderr]     |                                              --------- first borrow occurs due to use of `char_iter` in closure
[INFO] [stderr] ...
[INFO] [stderr] 205 |                     let s : String = get_identifier(c, &mut char_iter);
[INFO] [stderr]     |                                                        ^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 208 |                         "and" => return tokenize(TokenType::And),
[INFO] [stderr]     |                                         -------- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 10 previous errors; 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0502, E0506.
[INFO] [stderr] For more information about an error, try `rustc --explain E0502`.
[INFO] [stderr] error: could not compile `rlox`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "66d3f1e2a01cffa5df3d6634739172d2316c3e77b119b1576709b01bca49ffe8"`
[INFO] running `"docker" "rm" "-f" "66d3f1e2a01cffa5df3d6634739172d2316c3e77b119b1576709b01bca49ffe8"`
[INFO] [stdout] 66d3f1e2a01cffa5df3d6634739172d2316c3e77b119b1576709b01bca49ffe8