syntax_data: {"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // block begins as the successor of `drops[n]` and then becomes `drops[n]` so that `drops[n-1]`
context_before:     // in the diagram above) and then build the drops (e.g., `drop[1]`, `drop[0]`) that come before it.
context_after:     // will branch to `drops[n]`.