syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"self.tcx,"}]}
source_snippet:                                 self.tcx,
context_before:                             ValTree::from_branches(
context_after:                                 [ValTree::from_scalar_int(self.tcx, variant_index.as_u32().into())],