clippy bug report

This is the output of the 'cargo clippy --fix' command:

cargo clippy --fix
Checking equation-solver v0.1.0
warning: failed to automatically apply fixes suggested by rustc to crate equation_solver

after fixes were automatically applied the compiler reported errors within these files:

• src\lib.rs

This likely indicates a bug in either rustc or cargo itself,
and we would appreciate a bug report! You're likely to see
a number of compiler warnings after this message which cargo
attempted to fix but failed. If you could open an issue at
https://github.com/rust-lang/rust/issues
quoting the full output of this command we'd be very appreciative!
Note that you may be able to make some more progress in the near-term
fixing code with the --broken-code flag

The following errors were reported:
error[E0596]: cannot borrow term as mutable, as it is not declared as mutable
--> src\lib.rs:439:42
|
428 | term: Term,
| ---- help: consider changing this to be mutable: mut term
...
439 | let exceptions_in_domain = match term.solve()? {
| ^^^^^^^^^^^^ cannot borrow as mutable

error: aborting due to previous error

For more information about this error, try rustc --explain E0596.
Original diagnostics will follow.

warning: length comparison to zero
--> src\lib.rs:135:28
|
135 | if nested_terms.len() > 0 {
| ^^^^^^^^^^^^^^^^^^^^^^ help: using !is_empty is clearer and more explicit: !nested_terms.is_empty()
|
= note: #[warn(clippy::len_zero)] on by default
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero

warning: use of ok_or followed by a function call
--> src\lib.rs:164:26
|
164 | .ok_or(String::from("Equation is missing opening parenthesis"))?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: ok_or_else(|| String::from("Equation is missing opening parenthesis"))
|
= note: #[warn(clippy::or_fun_call)] on by default
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#or_fun_call

warning: length comparison to zero
--> src\lib.rs:177:12
|
177 | if nested_terms.len() > 0 {
| ^^^^^^^^^^^^^^^^^^^^^^ help: using !is_empty is clearer and more explicit: !nested_terms.is_empty()
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero

warning: redundant clone
--> src\lib.rs:439:46
|
439 | let exceptions_in_domain = match term.clone().solve()? {
| ^^^^^^^^ help: remove this
|
= note: #[warn(clippy::redundant_clone)] on by default
note: this value is dropped without further use
--> src\lib.rs:439:42
|
439 | let exceptions_in_domain = match term.clone().solve()? {
| ^^^^
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_clone

warning: redundant closure
--> src\lib.rs:442:22
|
442 | .map(|value| OrderedFloat(value))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: OrderedFloat
|
= note: #[warn(clippy::redundant_closure)] on by default
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure

warning: equation-solver (lib test) generated 5 warnings
warning: failed to automatically apply fixes suggested by rustc to crate equation_solver

after fixes were automatically applied the compiler reported errors within these files:

• src\lib.rs

This likely indicates a bug in either rustc or cargo itself,
and we would appreciate a bug report! You're likely to see
428 | term: Term,
| ---- help: consider changing this to be mutable: mut term
...
439 | let exceptions_in_domain = match term.solve()? {
| ^^^^^^^^^^^^ cannot borrow as mutable

error: aborting due to previous error

For more information about this error, try rustc --explain E0596.
Original diagnostics will follow.

warning: equation-solver (lib) generated 5 warnings (5 duplicates)
Finished dev [unoptimized + debuginfo] target(s) in 8.06s

Reproduce the report with cargo clippy --fix using the equation-solver example and inspect src/lib.rs around lines 428-442. Compare the failed rustc fix with the Clippy warnings for lines 135, 164, 177, 439, and 442; done means the command no longer reports the failed automatic fix for this case.