syntax_data: {"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":"#[allow(irrefutable_let_patterns)]"}]}
source_snippet:     #[allow(irrefutable_let_patterns)]
context_before:     // the mask for the highest reliable alignment.
context_after:     if let max_align = tcx.sess.target.max_reliable_alignment()