syntax_data: {"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let coroutine_instance = body.source.instance;
context_before:     // Update the body's def to become the drop glue.
context_after:     let drop_in_place = tcx.require_lang_item(LangItem::DropInPlace, body.span);