syntax_data: {"ast_node_type":"import","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // The first arg is the self ty - use the correct span for it.
context_before:                     let mut cause = traits::ObligationCause::misc(self.span, self.body_id);
context_after:                     if i == 0 {