syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // from that point. (Note that we haven't lowered the actual test yet!)
context_before:         // For each outcome of the test, recursively lower the rest of the match tree
context_after:         let target_blocks: FxIndexMap<_, _> = target_candidates