syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// gives rise to an output `MatchTreeBranch`. If one of the patterns matches, we branch to the
context_before: /// The result of generating MIR for a pattern-matching expression. Each input branch/arm/pattern
context_after: /// corresponding `success_block`. If none of the patterns matches, we branch to `otherwise_block`.