syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// to drop `x`, `x` and `y`, or neither depending on which binding fails.
context_before:     /// There are three possible ways the condition can be false and we may have
context_after:     /// To handle this correctly we use a `DropTree` in a similar way to a