syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"impl<I:"}]}
source_snippet: impl<I: Interner> PlaceholderConst<I> for I::PlaceholderConst {
context_before: }
context_after:     fn find_const_ty_from_env(self, env: I::ParamEnv) -> I::Ty {