syntax_data: {"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut wide_pointer_layout = layout;
context_before:         // get a built-in pointer type
context_after:         while !wide_pointer_layout.ty.is_raw_ptr() && !wide_pointer_layout.ty.is_ref() {