/// Preconditions:
///
/// - `for_vid` is a "root vid"
- #[instrument(skip(self), level = "trace")]
+ #[instrument(skip(self), level = "trace", ret)]
fn generalize(
&self,
ty: Ty<'tcx>,
cache: SsoHashMap::new(),
};
- let ty = match generalize.relate(ty, ty) {
- Ok(ty) => ty,
- Err(e) => {
- debug!(?e, "failure");
- return Err(e);
- }
- };
+ let ty = generalize.relate(ty, ty)?;
let needs_wf = generalize.needs_wf;
- trace!(?ty, ?needs_wf, "success");
Ok(Generalization { ty, needs_wf })
}
param_env: ty::ParamEnv<'tcx>,
- cache: SsoHashMap<Ty<'tcx>, RelateResult<'tcx, Ty<'tcx>>>,
+ cache: SsoHashMap<Ty<'tcx>, Ty<'tcx>>,
}
/// Result from a generalization operation. This includes
/// not only the generalized type, but also a bool flag
/// indicating whether further WF checks are needed.
+#[derive(Debug)]
struct Generalization<'tcx> {
ty: Ty<'tcx>,
fn tys(&mut self, t: Ty<'tcx>, t2: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {
assert_eq!(t, t2); // we are abusing TypeRelation here; both LHS and RHS ought to be ==
- if let Some(result) = self.cache.get(&t) {
- return result.clone();
+ if let Some(&result) = self.cache.get(&t) {
+ return Ok(result);
}
debug!("generalize: t={:?}", t);
Ok(t)
}
_ => relate::super_relate_tys(self, t, t),
- };
+ }?;
- self.cache.insert(t, result.clone());
- return result;
+ self.cache.insert(t, result);
+ Ok(result)
}
fn regions(
Ok(a.rebind(self.relate(a.skip_binder(), b.skip_binder())?))
}
- #[tracing::instrument(level = "debug", skip(self))]
+ #[instrument(level = "debug", skip(self), ret)]
fn tys(&mut self, t: Ty<'tcx>, _t: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {
debug_assert_eq!(t, _t);
- debug!("ConstInferUnifier: t={:?}", t);
match t.kind() {
&ty::Infer(ty::TyVar(vid)) => {
.borrow_mut()
.type_variables()
.new_var(self.for_universe, origin);
- let u = self.tcx().mk_ty_var(new_var_id);
- debug!(
- "ConstInferUnifier: replacing original vid={:?} with new={:?}",
- vid, u
- );
- Ok(u)
+ Ok(self.tcx().mk_ty_var(new_var_id))
}
}
}
}
}
- #[tracing::instrument(level = "debug", skip(self))]
+ #[instrument(level = "debug", skip(self))]
fn consts(
&mut self,
c: ty::Const<'tcx>,
_c: ty::Const<'tcx>,
) -> RelateResult<'tcx, ty::Const<'tcx>> {
debug_assert_eq!(c, _c);
- debug!("ConstInferUnifier: c={:?}", c);
match c.kind() {
ty::ConstKind::Infer(InferConst::Var(vid)) => {