syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let source = self.parse_operand(args[0])?;
context_before:             @call(mir_cast_ptr_to_ptr, args) => {
context_after:                 Ok(Rvalue::Cast(CastKind::PtrToPtr, source, expr.ty))