Yul compilation failed: ParserError: Switch statement without any cases.

[agroce]

Compiling this file:

contract Foo:
    my_u128: u128

thread 'main' panicked at 'Yul compilation failed: {"errors":[{"component":"general","formattedMessage":"ParserError: Switch statement without any cases.\n --> input.yul:1:3990:\n  |\n1 |  ... ta_size)) } } switch cloadn(0, 4)  }   }  }\n  |                                         ^\n\n","message":"Switch statement without any cases.","severity":"error","sourceLocation":{"end":3990,"file":"input.yul","start":3989},"type":"ParserError"},{"component":"general","formattedMessage":"ParserError: Expected end of source but got '}'\n --> input.yul:1:3997:\n  |\n1 |  ... )) } } switch cloadn(0, 4)  }   }  }\n  |                                         ^\n\n","message":"Expected end of source but got '}'","severity":"error","sourceLocation":{"end":3997,"file":"input.yul","start":3996},"type":"ParserError"}]}', compiler/src/lib.rs:45:27
stack backtrace:
   0: rust_begin_unwind
             at /rustc/c0b64d97beebb09325b5587abed39f4f1621026f/library/std/src/panicking.rs:493:5
   1: std::panicking::begin_panic_fmt
             at /rustc/c0b64d97beebb09325b5587abed39f4f1621026f/library/std/src/panicking.rs:435:5
   2: fe_compiler::compile
   3: fe::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
Aborted

On latest github master, built with

[profile.dev]
debug = true
panic = "abort"

for fuzzing. Using https://github.com/agroce/afl-compiler-fuzzer (we've found more than 50 bugs (that were worth fixing, and have been fixed) in solc using this afl variant) + afl.rs.

The PR works nicely!

[cburgdorf]

Ah yeah, that's a good one. I ran into it manually recently. Contracts without any methods trigger that error.