syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"impl<'a,"}]}
source_snippet: impl<'a, I: Interner> ArgFolder<'a, I> {
context_after:     fn ty_for_param(&self, p: I::ParamTy, source_ty: I::Ty) -> I::Ty {