syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         //   the expansion list as-is (i.e. it "expands" to itself).
context_before:         // - If a candidate doesn't start with an or-pattern, we include it in
context_after:         // - If a candidate has an or-pattern as its only remaining match pair,