syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"self.requires_unsafe(pat.span,"}]}
source_snippet:                                 self.requires_unsafe(pat.span, BorrowOfLayoutConstrainedField);
context_before:                             if !ty.is_freeze(self.tcx, self.typing_env) {
context_after:                             }