syntax_data: {"ast_node_type":"import","tokens":[{"end":90,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // the principal and projections from the type. We use the auto traits
context_before:                     // If we're unsizing to a dyn type that has no principal, then drop
context_after:                     // from the RHS type since as we noted that we've checked for auto