syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // `#[const_continue]` can figure out what basic block to jump to.
context_before:                     // jumps to when a value matches the arm). This structure is stored so that a
context_after:                     let built_tree = this.lower_match_tree(