Add error for EOF transition reachable in closure from itself

If the closure of the right side of an EOF transition sees the left side of that transition, it would result in a stack overflow in closure. This situation should be detected and reported as an error when the grammar is compiled.

Start by tracing EOF transition handling and closure computation during grammar compilation. Reproduce a grammar where the closure of an EOF transition's right side reaches its left side, then inspect existing grammar error reporting. Done means the recursive case is detected and reported as a compilation error instead of causing a stack overflow.

Written by the indexing model from the issue text.