syntax_data: {"ast_node_type":"variable","tokens":[{"end":38,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let branch_otherwise =
context_before:                 // Recursively lower the rest of the match tree after the relevant outcome.
context_after:                     self.match_candidates(span, scrutinee_span, branch_start, &mut *candidates);