syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // jumps to when a value matches the arm). This structure is stored so that a
context_before:                     // The `built_tree` maps match arms to their basic block (where control flow
context_after:                     // `#[const_continue]` can figure out what basic block to jump to.