cannot use `state` because it was mutably borrowed

[soc1c]

~/.opt/parity-bitcoin master
❯ cargo build --release
   Compiling getopts v0.2.15
   Compiling linked-hash-map v0.4.2
   Compiling slab v0.4.0
   Compiling serde v1.0.21
   Compiling quick-error v1.2.1
   Compiling utf8-ranges v1.0.0
error[E0503]: cannot use `state` because it was mutably borrowed
    --> /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/getopts-0.2.15/src/lib.rs:1033:33
     |
978  |     let mut machine = |cont: &mut bool, (i, c): (usize, char)| {
     |                       ---------------------------------------- borrow of `state` occurs here
...
982  |         state = match (state, whitespace, limit) {
     |                        ----- borrow occurs due to use of `state` in closure
...
1033 |     while cont && match state { B | C => true, A => false } {
     |                                 ^ use of borrowed `state`
1034 |         machine(&mut cont, (fake_i, ' '));
     |         ------- borrow later used here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0503`.
error: Could not compile `getopts`.
warning: build failed, waiting for other jobs to finish...
error: build failed

~/.opt/parity-bitcoin master 7s
❯ git log -n1
commit d70cf432537ad0a595bfb5d20b22fde98fe47da6 (HEAD -> master, origin/master, origin/HEAD)
Merge: 40c3b37 a089130
Author: Nikolay Volf <nikvolf@gmail.com>
Date:   Tue Oct 1 11:32:13 2019 +0300

    Merge pull request #566 from D3v3sh5ingh/patch-1
    
    fixed typos and improved documentation

~/.opt/parity-bitcoin master
❯ uname -a
Linux host 5.3.1-arch1-1-ARCH #1 SMP PREEMPT Sat Sep 21 11:33:49 UTC 2019 x86_64 GNU/Linux

~/.opt/parity-bitcoin master
❯ rustc --version
rustc 1.38.0 (625451e37 2019-09-23)