syntax_data: {"ast_node_type":"variable","tokens":[{"end":90,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let mut visitor = LayoutConstrainedPlaceVisitor::new(self.thir, self.tcx);
context_before:                 // First, check whether we are mutating a layout constrained field
context_after:                 visit::walk_expr(&mut visitor, lhs);