syntax_data: {"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let operand = unpack!(block = this.as_temp(block, scope, expr_id, Mutability::Mut));
context_before:             Category::Constant | Category::Place | Category::Rvalue(..) => {
context_after:                 // Overwrite temp local info if we have something more interesting to record.