syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // (Note that the subcandidates have already had their part of the match
context_before:         // all to join up at a single shared pre-binding block.
context_after:         // tree lowered by this point, which is why we can add a goto to them.)