syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // deconstructed to obtain the constant value and other data.
context_before:         // Lower the endpoint into a temporary `PatKind` that will then be
context_after:         let mut kind: PatKind<'tcx> = self.lower_pat_expr(expr, None);