syntax_data: {"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let pin_adt_ref = tcx.adt_def(pin_did);
context_before:     let pin_did = tcx.require_lang_item(LangItem::Pin, body.span);
context_after:     let args = tcx.mk_args(&[ref_coroutine_ty.into()]);