toggle_multiline() breaks casting in Rust

[Ciel-MC]

Before:

After:

[Ciel-MC]

Notably, https://github.com/Wansmer/treesj/ handles it fine.

[CKolkey]

Could you post the correct before/after (and maybe a couple other test cases) so I can build a spec? I don't actually use rust :)

[Ciel-MC]

Could you post the correct before/after (and maybe a couple other test cases) so I can build a spec? I don't actually use rust :)

Hey, I have mentioned the correct way it should be formatted in my previous comment, but I'll try and find more examples tomorrow.

[Ciel-MC]

Found another issue, something like

fn test() {
    let foo = stuff();
}```
gets collapsed into
```rust
fn test() { letfoo = stuff(); }

it is mostly right, but let variable and let mut variable gets collapsed into letvariable and letmutvarialble respectively, which, yk, isn't good.

Before:

Actual:

Expect:

[Ciel-MC]

Found another issue, something like

fn test() {
    let foo = stuff();
}```
gets collapsed into
```rust
fn test() { letfoo = stuff(); }

it is mostly right, but let variable and let mut variable gets collapsed into letvariable and letmutvarialble respectively, which, yk, isn't good.

Before: Actual: Expect:

In addition, mutable borrows are also incorrectly collapsed, &mut buf -> &mutbuf, both as a type in function signatures fn test(foo: &mut Foo) and as a value value.serialize(&mut serializer)

The common part of all the problems seems to be that tokens separated by whitespaces are merged together, maybe some sort of system needs to be in place to ensure that certain tokens are separated by whitespaces after collapsing. Again mentioning treesj, all the above situations are handled by treesj just fine, just mentioning it because it might help as a reference.

[alexpw]

@Ciel-MC thank you for the examples. I've fixed all that were mentioned, if you'd like to try that branch and confirm (#42). Please keep 'em coming, if you find more cases.