syntax_data: {"ast_node_type":"function","tokens":[{"end":65,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn expr_is_poly(&mut self, expr: &thir::Expr<'tcx>) -> bool {
context_before: impl<'a, 'tcx> IsThirPolymorphic<'a, 'tcx> {
context_after:         if expr.ty.has_non_region_param() {