Reference types proposal requires to throw a new type of exception for incorrect data sections or element sections, now we should throw RuntimeError instead of LinkingError. However, community don't pay much attention to the type of exception and consider this as minor thing - https://github.com/WebAssembly/bulk-memory-operations/issues/133. So right now we could raise LinkingError and switch to RuntimeError when reference types will be enabled by default.
<rdar://problem/73232827>