[ICE] assert causes compiler crash

```fe
contract C {
pub fn f(self, a: bool) -> bool {
let b: bool = a;
let x: bool = b;
assert b == true
return x;
}
}
```
```
fe build test.fe
```
```
Error: ParserError: Literal or identifier expected.
--> input.yul:13:37:
|
13 | let $ret := assert_1-250907121115$C$f($a)
| ^

Error: ParserError: Expected keyword "data" or "object" or "}".
--> input.yul:13:37:
|
13 | let $ret := assert_1-250907121115$C$f($a)
| ^

thread 'main' panicked at crates/driver/src/lib.rs:356:13:
Yul compilation failed with the above errors
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

You've hit an internal compiler error. This is a bug in the Fe compiler.
Fe is still under heavy development, and isn't yet ready for production use.

If you would, please report this bug at the following URL:
https://github.com/ethereum/fe/issues/new
```

Reproduce the crash with the provided contract in test.fe by running `fe build test.fe`. Inspect generated input.yul around line 13 and the failure reported at crates/driver/src/lib.rs:356. Done when this example no longer produces the Yul parser errors or the internal compiler panic.

Written by the indexing model from the issue text.