syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                     if adt_def.variant(*variant_index).fields[*field].safety.is_unsafe() {
context_before:                     let field = &pat.field;
context_after:                         self.requires_unsafe(pat.pattern.span, UseOfUnsafeField);