syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // First, check whether we are mutating a layout constrained field
context_before:                 let lhs = &self.thir[lhs];
context_after:                 let mut visitor = LayoutConstrainedPlaceVisitor::new(self.thir, self.tcx);