syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"hir::PatKind::Box(subpattern)"}]}
source_snippet:             hir::PatKind::Box(subpattern) => PatKind::DerefPattern {
context_before:             }
context_after:                 subpattern: self.lower_pattern(subpattern),