syntax_data: {"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let Some(alloc) = args.get(1) else {
context_before:             Adt(def, args) if def.is_box() => {
context_after:                     // Single-argument Box is always global. (for "minicore" tests)