syntax_data: {"ast_node_type":"function","tokens":[{"end":98,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn new(pat_ctxt: &PatCtxt<'_, 'tcx>, id: hir::HirId, span: Span, c: ty::Const<'tcx>) -> Self {
context_before: impl<'tcx> ConstToPat<'tcx> {
context_after:         trace!(?pat_ctxt.typeck_results.hir_owner);