syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // Make sure the expression we're deref'ing is safe, though.
context_before:                     // Taking a raw ref to a deref place expr is always safe.
context_after:                     visit::walk_expr(self, &self.thir[arg]);