-use crate::ty::{self, GenericParamDefKind, Ty, TyCtxt, InferConst};
-use crate::ty::{FloatVid, IntVid, TyVid, ConstVid};
-use crate::util::nodemap::{FxHashMap, FxHashSet};
+use crate::ty::{self, GenericParamDefKind, InferConst, Ty, TyCtxt};
+use crate::ty::{ConstVid, FloatVid, IntVid, TyVid};