How to workaround assignment not allowed in a condition?

[Steven Schveighoffer]

Porting some C code to D

This results in an error:

```d
int x;
while(!(x = 5)) { break; }
```
Error is: assignment cannot be used as a condition, perhaps `==` was meant?

OK, fine, I'll use `==`:

```d
int x;
while(!(x = 5) == true) { break; }
```

Nope, same error. I tried reversing the operands. I also tried using it 
in a boolean expression. As long as `=` appears in there, it gives me 
the error.

The only thing I can get to work is to make an immediately called lambda:

```d
while(!(() => x = 5)()) { break; }
```

Is this seriously the only way to get around this? With other linting 
errors, there's usually an easy workaround. like:

```d
if(x); // Error
if(x) {} // ok
```

Am I missing something?

-Steve