ICE: Illegal token

[Subway2023]

This bug is very strange. If I copy the program into another Fe file, it compiles normally. Therefore, it is quite confusing.

contract C{
    pub fn bar(self) -> u256{
        let a: u256 = 123
        return a
    }
}

fe build test.fe

Error: ParserError: Illegal token: Identifier-start is not allowed at end of a number.
  --> input.yul:11:29:
   |
11 |                 let $ret := 3$C$bar()
   |                             ^


Error: ParserError: Expected keyword "data" or "object" or "}".
  --> input.yul:11:29:
   |
11 |                 let $ret := 3$C$bar()
   |                             ^


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