syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"//!"}]}
source_snippet: //! well as `a[13]`, etc. So we map these `x`/`y` values to `()`.
context_before: //! needs to be treated as mapping to the same move path as `a[y]` as
context_after: //!