syntax_data: {"ast_node_type":"import","tokens":[{"end":74,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// To handle this correctly we use a `DropTree` in a similar way to a
context_before:     /// to drop `x`, `x` and `y`, or neither depending on which binding fails.
context_after:     /// `loop` expression and 'break' out on all of the 'else' paths.