15.8.3 Lexical contours inspection

We will inspect the fields of <stx> objects and rib objects to understand how the lexical environment’s data structures are used to represent lexical contours.

We will examine the expansion of nested internal-body uses: these syntaxes are the simplest because they create a single lexical contour. We will inspect the syntactic identifiers and rib objects from the body of a begin-for-syntax use.