syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"impl<I:"}]}
source_snippet: impl<I: Interner> ExistentialTraitRef<I> {
context_after:     pub fn new_from_args(interner: I, trait_def_id: I::DefId, args: I::GenericArgs) -> Self {