syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                         // This is horrendous, and we should deal with it by just
context_before:                     hir::MatchSource::Postfix => {
context_after:                         // stashing the span of the braces somewhere (like in the match source).