message: Add a BB terminator, I guess
diff: @@ -81,13 +81,14 @@ fn compile_func(func: bril::Function) {
  };
  builder.def_var(*var, val);
  },
  - _ => todo!(),
  + _ => (), // TODO
  }
  },
  - _ => todo!(),
  + _ => (), // TODO
  }
  }
  + builder.ins().return_(&[]); // TODO
  builder.seal_block(block);
  builder.finalize();
  