syntax_data: {"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let fun = unpack!(block = this.as_local_operand(block, fun));
context_before:                 this.in_scope((region_scope, source_info), lint_level, |this| {
context_after:                     let args: Box<[_]> = args