syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"guard_span"}]}
source_snippet:                     guard_span = this.thir[guard].span;
context_before:                 self.in_if_then_scope(match_scope, guard_span, |this| {
context_after:                     this.then_else_break(