syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"impl<'a,"}]}
source_snippet: impl<'a, 'tcx> IsThirPolymorphic<'a, 'tcx> {
context_after:     fn expr_is_poly(&mut self, expr: &thir::Expr<'tcx>) -> bool {