syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"PatKind::DerefPattern"}]}
source_snippet:                     PatKind::DerefPattern { subpattern: thir_pat, borrow }
context_before:                     let borrow = self.typeck_results.deref_pat_borrow_mode(adjust.source, pat);
context_after:                 }