syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // took `(2, _)` in the same set of candidates, when we reach the block that tests
context_before:         // so the `1` and `2` cases branch to a same block (which then tests `false`). If we
context_after:         // `false` we don't know whether we came from `1` or `2`, hence we can't know where