syntax_data: {"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let Ok(pat) = this.lower_pattern(&cx, &arm.pattern) else { return true };
context_before:             let got_error = self.with_lint_level(arm.lint_level, |this| {
context_after:                 let arm =