[INFO] crate kg-tree 0.1.4 is already in cache
[INFO] extracting crate kg-tree 0.1.4 into work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/reg/kg-tree/0.1.4
[INFO] extracting crate kg-tree 0.1.4 into work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/reg/kg-tree/0.1.4
[INFO] validating manifest of kg-tree-0.1.4 on toolchain master#c43d03a19f326f4a323569328cc501e86eb6d22e
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of kg-tree-0.1.4 on toolchain try#75eff020d0923c035c2fe220db4a0465cd847048
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing kg-tree-0.1.4
[INFO] finished frobbing kg-tree-0.1.4
[INFO] frobbed toml for kg-tree-0.1.4 written to work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/reg/kg-tree/0.1.4/Cargo.toml
[INFO] started frobbing kg-tree-0.1.4
[INFO] finished frobbing kg-tree-0.1.4
[INFO] frobbed toml for kg-tree-0.1.4 written to work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/reg/kg-tree/0.1.4/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking kg-tree-0.1.4 against master#c43d03a19f326f4a323569328cc501e86eb6d22e for pr-63565
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63565/worker-3/master#c43d03a19f326f4a323569328cc501e86eb6d22e:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/reg/kg-tree/0.1.4:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] b5473caabfd39129ef1033193a8dfdb187e6aa2c203765de452172007903b291
[INFO] running `"docker" "start" "-a" "b5473caabfd39129ef1033193a8dfdb187e6aa2c203765de452172007903b291"`
[INFO] [stderr]    Compiling static_assertions v0.3.4
[INFO] [stderr]     Checking lock_api v0.2.0
[INFO] [stderr]    Compiling heapsize v0.4.2
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking kg-utils v0.2.4
[INFO] [stderr]    Compiling stackvector v1.0.7
[INFO] [stderr]    Compiling heapsize_derive v0.1.4
[INFO] [stderr]     Checking kg-display v0.1.2
[INFO] [stderr]    Compiling lexical-core v0.4.3
[INFO] [stderr]     Checking kg-symbol v0.1.10
[INFO] [stderr]    Compiling nom v5.0.1
[INFO] [stderr]    Compiling synstructure v0.11.0
[INFO] [stderr]    Compiling kg-display-derive v0.1.1
[INFO] [stderr]    Compiling kg-diag v0.2.7
[INFO] [stderr]    Compiling kg-diag-derive v0.2.3
[INFO] [stderr]     Checking kg-tree v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: could not find `Parser` in `parse`
[INFO] [stderr]    --> src/opath/interpolation.rs:217:39
[INFO] [stderr]     |
[INFO] [stderr] 217 |             expr_parser: self::parse::Parser::new().with_partial(true),
[INFO] [stderr]     |                                       ^^^^^^ could not find `Parser` in `parse`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `ParseErr` in `parse`
[INFO] [stderr]    --> src/opath/interpolation.rs:261:49
[INFO] [stderr]     |
[INFO] [stderr] 261 |                             return self::parse::ParseErr::unexpected_eoi_str(
[INFO] [stderr]     |                                                 ^^^^^^^^ could not find `ParseErr` in `parse`
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `Parser` in module `self::parse`
[INFO] [stderr]    --> src/opath/interpolation.rs:189:31
[INFO] [stderr]     |
[INFO] [stderr] 189 |     expr_parser: self::parse::Parser,
[INFO] [stderr]     |                               ^^^^^^ not found in `self::parse`
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]     |
[INFO] [stderr] 1   | use crate::opath::expr::parse::Parser;
[INFO] [stderr]     |
[INFO] [stderr] 1   | use crate::opath::interpolation::Parser;
[INFO] [stderr]     |
[INFO] [stderr] 1   | use crate::serial::fmt::json::Parser;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0659]: `parse` is ambiguous (glob import vs glob import in the same module)
[INFO] [stderr]    --> src/opath/interpolation.rs:189:24
[INFO] [stderr]     |
[INFO] [stderr] 189 |     expr_parser: self::parse::Parser,
[INFO] [stderr]     |                        ^^^^^ ambiguous name
[INFO] [stderr]     |
[INFO] [stderr] note: `parse` could refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:1:5
[INFO] [stderr]     |
[INFO] [stderr] 1   | use super::*;
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] note: `parse` could also refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:9:5
[INFO] [stderr]     |
[INFO] [stderr] 9   | use self::expr::*;
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] 
[INFO] [stderr] error[E0659]: `parse` is ambiguous (glob import vs glob import in the same module)
[INFO] [stderr]    --> src/opath/interpolation.rs:217:32
[INFO] [stderr]     |
[INFO] [stderr] 217 |             expr_parser: self::parse::Parser::new().with_partial(true),
[INFO] [stderr]     |                                ^^^^^ ambiguous name
[INFO] [stderr]     |
[INFO] [stderr] note: `parse` could refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:1:5
[INFO] [stderr]     |
[INFO] [stderr] 1   | use super::*;
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] note: `parse` could also refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:9:5
[INFO] [stderr]     |
[INFO] [stderr] 9   | use self::expr::*;
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] 
[INFO] [stderr] error[E0659]: `parse` is ambiguous (glob import vs glob import in the same module)
[INFO] [stderr]    --> src/opath/interpolation.rs:261:42
[INFO] [stderr]     |
[INFO] [stderr] 261 |                             return self::parse::ParseErr::unexpected_eoi_str(
[INFO] [stderr]     |                                          ^^^^^ ambiguous name
[INFO] [stderr]     |
[INFO] [stderr] note: `parse` could refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:1:5
[INFO] [stderr]     |
[INFO] [stderr] 1   | use super::*;
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] note: `parse` could also refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:9:5
[INFO] [stderr]     |
[INFO] [stderr] 9   | use self::expr::*;
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `Parser` in `parse`
[INFO] [stderr]    --> src/opath/interpolation.rs:217:39
[INFO] [stderr]     |
[INFO] [stderr] 217 |             expr_parser: self::parse::Parser::new().with_partial(true),
[INFO] [stderr]     |                                       ^^^^^^ could not find `Parser` in `parse`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `ParseErr` in `parse`
[INFO] [stderr]    --> src/opath/interpolation.rs:261:49
[INFO] [stderr]     |
[INFO] [stderr] 261 |                             return self::parse::ParseErr::unexpected_eoi_str(
[INFO] [stderr]     |                                                 ^^^^^^^^ could not find `ParseErr` in `parse`
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `Parser` in module `self::parse`
[INFO] [stderr]    --> src/opath/interpolation.rs:189:31
[INFO] [stderr]     |
[INFO] [stderr] 189 |     expr_parser: self::parse::Parser,
[INFO] [stderr]     |                               ^^^^^^ not found in `self::parse`
[INFO] [stderr] help: possible candidates are found in other modules, you can import them into scope
[INFO] [stderr]     |
[INFO] [stderr] 1   | use crate::opath::expr::parse::Parser;
[INFO] [stderr]     |
[INFO] [stderr] 1   | use crate::opath::interpolation::Parser;
[INFO] [stderr]     |
[INFO] [stderr] 1   | use crate::serial::fmt::json::Parser;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0659]: `parse` is ambiguous (glob import vs glob import in the same module)
[INFO] [stderr]    --> src/opath/interpolation.rs:189:24
[INFO] [stderr]     |
[INFO] [stderr] 189 |     expr_parser: self::parse::Parser,
[INFO] [stderr]     |                        ^^^^^ ambiguous name
[INFO] [stderr]     |
[INFO] [stderr] note: `parse` could refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:1:5
[INFO] [stderr]     |
[INFO] [stderr] 1   | use super::*;
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] note: `parse` could also refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:9:5
[INFO] [stderr]     |
[INFO] [stderr] 9   | use self::expr::*;
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] 
[INFO] [stderr] error[E0659]: `parse` is ambiguous (glob import vs glob import in the same module)
[INFO] [stderr]    --> src/opath/interpolation.rs:217:32
[INFO] [stderr]     |
[INFO] [stderr] 217 |             expr_parser: self::parse::Parser::new().with_partial(true),
[INFO] [stderr]     |                                ^^^^^ ambiguous name
[INFO] [stderr]     |
[INFO] [stderr] note: `parse` could refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:1:5
[INFO] [stderr]     |
[INFO] [stderr] 1   | use super::*;
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] note: `parse` could also refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:9:5
[INFO] [stderr]     |
[INFO] [stderr] 9   | use self::expr::*;
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] 
[INFO] [stderr] error[E0659]: `parse` is ambiguous (glob import vs glob import in the same module)
[INFO] [stderr]    --> src/opath/interpolation.rs:261:42
[INFO] [stderr]     |
[INFO] [stderr] 261 |                             return self::parse::ParseErr::unexpected_eoi_str(
[INFO] [stderr]     |                                          ^^^^^ ambiguous name
[INFO] [stderr]     |
[INFO] [stderr] note: `parse` could refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:1:5
[INFO] [stderr]     |
[INFO] [stderr] 1   | use super::*;
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] note: `parse` could also refer to the module imported here
[INFO] [stderr]    --> src/opath/mod.rs:9:5
[INFO] [stderr]     |
[INFO] [stderr] 9   | use self::expr::*;
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr]     = help: consider adding an explicit import of `parse` to disambiguate
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> src/serial/fmt/json.rs:561:9
[INFO] [stderr]     |
[INFO] [stderr] 561 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `skip_while_mut` found for type `&mut dyn tree::_DERIVE_kg_diag_Detail_FOR_TreeErrorDetail::kg_diag::CharReader` in the current scope
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:551:19
[INFO] [stderr]     |
[INFO] [stderr] 551 |                 r.skip_while_mut(&mut |c| {
[INFO] [stderr]     |                   ^^^^^^^^^^^^^^ help: there is a method with a similar name: `skip_while`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `skip_while_mut` found for type `&mut dyn tree::_DERIVE_kg_diag_Detail_FOR_TreeErrorDetail::kg_diag::CharReader` in the current scope
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:580:27
[INFO] [stderr]     |
[INFO] [stderr] 580 |                         r.skip_while_mut(&mut |c| {
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^ help: there is a method with a similar name: `skip_while`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:606:34
[INFO] [stderr]     |
[INFO] [stderr] 606 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:612:45
[INFO] [stderr]     |
[INFO] [stderr] 612 |                 if r.match_str_term("null", &is_non_ident_char)? {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:617:51
[INFO] [stderr]     |
[INFO] [stderr] 617 |                 } else if r.match_str_term("not", &is_non_ident_char)? {
[INFO] [stderr]     |                                                   ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:625:34
[INFO] [stderr]     |
[INFO] [stderr] 625 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:631:45
[INFO] [stderr]     |
[INFO] [stderr] 631 |                 if r.match_str_term("true", &is_non_ident_char)? {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:639:34
[INFO] [stderr]     |
[INFO] [stderr] 639 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `skip_while_mut` found for type `&mut dyn tree::_DERIVE_kg_diag_Detail_FOR_TreeErrorDetail::kg_diag::CharReader` in the current scope
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:551:19
[INFO] [stderr]     |
[INFO] [stderr] 551 |                 r.skip_while_mut(&mut |c| {
[INFO] [stderr]     |                   ^^^^^^^^^^^^^^ help: there is a method with a similar name: `skip_while`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `skip_while_mut` found for type `&mut dyn tree::_DERIVE_kg_diag_Detail_FOR_TreeErrorDetail::kg_diag::CharReader` in the current scope
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:580:27
[INFO] [stderr]     |
[INFO] [stderr] 580 |                         r.skip_while_mut(&mut |c| {
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^ help: there is a method with a similar name: `skip_while`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:645:46
[INFO] [stderr]     |
[INFO] [stderr] 645 |                 if r.match_str_term("false", &is_non_ident_char)? {
[INFO] [stderr]     |                                              ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:653:34
[INFO] [stderr]     |
[INFO] [stderr] 653 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:659:44
[INFO] [stderr]     |
[INFO] [stderr] 659 |                 if r.match_str_term("and", &is_non_ident_char)? {
[INFO] [stderr]     |                                            ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:606:34
[INFO] [stderr]     |
[INFO] [stderr] 606 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:667:34
[INFO] [stderr]     |
[INFO] [stderr] 667 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:612:45
[INFO] [stderr]     |
[INFO] [stderr] 612 |                 if r.match_str_term("null", &is_non_ident_char)? {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:673:43
[INFO] [stderr]     |
[INFO] [stderr] 673 |                 if r.match_str_term("or", &is_non_ident_char)? {
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:617:51
[INFO] [stderr]     |
[INFO] [stderr] 617 |                 } else if r.match_str_term("not", &is_non_ident_char)? {
[INFO] [stderr]     |                                                   ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:681:34
[INFO] [stderr]     |
[INFO] [stderr] 681 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:689:30
[INFO] [stderr]     |
[INFO] [stderr] 689 |                 r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:625:34
[INFO] [stderr]     |
[INFO] [stderr] 625 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:696:30
[INFO] [stderr]     |
[INFO] [stderr] 696 |                 r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/opath/expr/parse/mod.rs:696:31: 696:49]`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:704:38
[INFO] [stderr]     |
[INFO] [stderr] 704 |                         r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/opath/expr/parse/mod.rs:704:39: 704:57]`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `skip_while_mut` found for type `&mut dyn tree::_DERIVE_kg_diag_Detail_FOR_TreeErrorDetail::kg_diag::CharReader` in the current scope
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:376:23
[INFO] [stderr]     |
[INFO] [stderr] 376 |                     r.skip_while_mut(&mut |c| {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^ help: there is a method with a similar name: `skip_while`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:631:45
[INFO] [stderr]     |
[INFO] [stderr] 631 |                 if r.match_str_term("true", &is_non_ident_char)? {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:396:34
[INFO] [stderr]     |
[INFO] [stderr] 396 |                     r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/opath/expr/parse/mod.rs:396:35: 396:53]`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:639:34
[INFO] [stderr]     |
[INFO] [stderr] 639 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:645:46
[INFO] [stderr]     |
[INFO] [stderr] 645 |                 if r.match_str_term("false", &is_non_ident_char)? {
[INFO] [stderr]     |                                              ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:320:45
[INFO] [stderr]     |
[INFO] [stderr] 320 |                 if r.match_str_term("null", &is_non_alphanumeric)? {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {serial::fmt::is_non_alphanumeric}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:653:34
[INFO] [stderr]     |
[INFO] [stderr] 653 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:327:45
[INFO] [stderr]     |
[INFO] [stderr] 327 |                 if r.match_str_term("true", &is_non_alphanumeric)? {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {serial::fmt::is_non_alphanumeric}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:334:46
[INFO] [stderr]     |
[INFO] [stderr] 334 |                 if r.match_str_term("false", &is_non_alphanumeric)? {
[INFO] [stderr]     |                                              ^^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {serial::fmt::is_non_alphanumeric}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:659:44
[INFO] [stderr]     |
[INFO] [stderr] 659 |                 if r.match_str_term("and", &is_non_ident_char)? {
[INFO] [stderr]     |                                            ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:667:34
[INFO] [stderr]     |
[INFO] [stderr] 667 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:343:30
[INFO] [stderr]     |
[INFO] [stderr] 343 |                 r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/serial/fmt/json.rs:343:31: 343:49]`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:351:38
[INFO] [stderr]     |
[INFO] [stderr] 351 |                         r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/serial/fmt/json.rs:351:39: 351:57]`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `skip_while_mut` found for type `&mut dyn tree::_DERIVE_kg_diag_Detail_FOR_TreeErrorDetail::kg_diag::CharReader` in the current scope
[INFO] [stderr]    --> src/serial/fmt/json.rs:279:23
[INFO] [stderr]     |
[INFO] [stderr] 279 |                     r.skip_while_mut(&mut |c| if c.is_digit(10) {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^ help: there is a method with a similar name: `skip_while`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:673:43
[INFO] [stderr]     |
[INFO] [stderr] 673 |                 if r.match_str_term("or", &is_non_ident_char)? {
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {opath::expr::parse::is_non_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:294:34
[INFO] [stderr]     |
[INFO] [stderr] 294 |                     r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/serial/fmt/json.rs:294:35: 294:53]`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 32 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0412, E0433, E0599, E0659.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `kg-tree`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:681:34
[INFO] [stderr]     |
[INFO] [stderr] 681 |                     r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:689:30
[INFO] [stderr]     |
[INFO] [stderr] 689 |                 r.skip_while(&is_ident_char)?;
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&fn(char) -> bool {opath::expr::parse::is_ident_char}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:696:30
[INFO] [stderr]     |
[INFO] [stderr] 696 |                 r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/opath/expr/parse/mod.rs:696:31: 696:49]`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:704:38
[INFO] [stderr]     |
[INFO] [stderr] 704 |                         r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/opath/expr/parse/mod.rs:704:39: 704:57]`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `skip_while_mut` found for type `&mut dyn tree::_DERIVE_kg_diag_Detail_FOR_TreeErrorDetail::kg_diag::CharReader` in the current scope
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:376:23
[INFO] [stderr]     |
[INFO] [stderr] 376 |                     r.skip_while_mut(&mut |c| {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^ help: there is a method with a similar name: `skip_while`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/opath/expr/parse/mod.rs:396:34
[INFO] [stderr]     |
[INFO] [stderr] 396 |                     r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/opath/expr/parse/mod.rs:396:35: 396:53]`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:320:45
[INFO] [stderr]     |
[INFO] [stderr] 320 |                 if r.match_str_term("null", &is_non_alphanumeric)? {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {serial::fmt::is_non_alphanumeric}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:327:45
[INFO] [stderr]     |
[INFO] [stderr] 327 |                 if r.match_str_term("true", &is_non_alphanumeric)? {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {serial::fmt::is_non_alphanumeric}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:334:46
[INFO] [stderr]     |
[INFO] [stderr] 334 |                 if r.match_str_term("false", &is_non_alphanumeric)? {
[INFO] [stderr]     |                                              ^^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(std::option::Option<char>) -> bool`
[INFO] [stderr]                found type `&fn(std::option::Option<char>) -> bool {serial::fmt::is_non_alphanumeric}`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:343:30
[INFO] [stderr]     |
[INFO] [stderr] 343 |                 r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/serial/fmt/json.rs:343:31: 343:49]`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:351:38
[INFO] [stderr]     |
[INFO] [stderr] 351 |                         r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/serial/fmt/json.rs:351:39: 351:57]`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `skip_while_mut` found for type `&mut dyn tree::_DERIVE_kg_diag_Detail_FOR_TreeErrorDetail::kg_diag::CharReader` in the current scope
[INFO] [stderr]    --> src/serial/fmt/json.rs:279:23
[INFO] [stderr]     |
[INFO] [stderr] 279 |                     r.skip_while_mut(&mut |c| if c.is_digit(10) {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^ help: there is a method with a similar name: `skip_while`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/serial/fmt/json.rs:294:34
[INFO] [stderr]     |
[INFO] [stderr] 294 |                     r.skip_while(&|c| c.is_digit(10))?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&mut dyn std::ops::FnMut(char) -> bool`
[INFO] [stderr]                found type `&[closure@src/serial/fmt/json.rs:294:35: 294:53]`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 32 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0412, E0433, E0599, E0659.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `kg-tree`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b5473caabfd39129ef1033193a8dfdb187e6aa2c203765de452172007903b291"`
[INFO] running `"docker" "rm" "-f" "b5473caabfd39129ef1033193a8dfdb187e6aa2c203765de452172007903b291"`
[INFO] [stdout] b5473caabfd39129ef1033193a8dfdb187e6aa2c203765de452172007903b291