syntax_data: {"ast_node_type":"other","tokens":[{"end":114,"kind":"keyword","start":0,"text":"@call(mir_ptr_metadata,"}]}
source_snippet:             @call(mir_ptr_metadata, args) => Ok(Rvalue::UnaryOp(UnOp::PtrMetadata, self.parse_operand(args[0])?)),
context_before:             @call(mir_len, args) => Ok(Rvalue::Len(self.parse_place(args[0])?)),
context_after:             @call(mir_copy_for_deref, args) => Ok(Rvalue::CopyForDeref(self.parse_place(args[0])?)),