Fix use of has_infer_types

* Add a new method `has_infer_types_or_consts` that's used instead most
  of the time, since there's generally no reason to only consider types.
*  Remove use of `has_closure_types`, because closures are no longer
  implicitly linked to the `InferCtxt`.

Author: matthewjasper

src/librustc/ty/fold.rs

@@ -90,6 +90,9 @@ pub trait TypeFoldable<'tcx>: fmt::Debug + Clone {
     fn has_infer_types(&self) -> bool {
         self.has_type_flags(TypeFlags::HAS_TY_INFER)
     }
+    fn has_infer_types_or_consts(&self) -> bool {
+        self.has_type_flags(TypeFlags::HAS_TY_INFER | TypeFlags::HAS_CT_INFER)
+    }
     fn has_infer_consts(&self) -> bool {
         self.has_type_flags(TypeFlags::HAS_CT_INFER)
     }
@@ -114,9 +117,6 @@ pub trait TypeFoldable<'tcx>: fmt::Debug + Clone {
     fn has_re_placeholders(&self) -> bool {
         self.has_type_flags(TypeFlags::HAS_RE_PLACEHOLDER)
     }
-    fn has_closure_types(&self) -> bool {
-        self.has_type_flags(TypeFlags::HAS_TY_CLOSURE)
-    }
     /// "Free" regions in this context means that it has any region
     /// that is not (a) erased or (b) late-bound.
     fn has_free_regions(&self) -> bool {

src/librustc/ty/layout.rs

@@ -502,7 +502,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
         let univariant = |fields: &[TyLayout<'_>], repr: &ReprOptions, kind| {
             Ok(tcx.intern_layout(self.univariant_uninterned(ty, fields, repr, kind)?))
         };
-        debug_assert!(!ty.has_infer_types());
+        debug_assert!(!ty.has_infer_types_or_consts());
 
         Ok(match ty.kind {
             // Basic scalars.
@@ -1752,7 +1752,7 @@ impl<'tcx> SizeSkeleton<'tcx> {
         tcx: TyCtxt<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
     ) -> Result<SizeSkeleton<'tcx>, LayoutError<'tcx>> {
-        debug_assert!(!ty.has_infer_types());
+        debug_assert!(!ty.has_infer_types_or_consts());
 
         // First try computing a static layout.
         let err = match tcx.layout_of(param_env.and(ty)) {

src/librustc_infer/infer/freshen.rs

@@ -143,10 +143,7 @@ impl<'a, 'tcx> TypeFolder<'tcx> for TypeFreshener<'a, 'tcx> {
     }
 
     fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
-        if !(t.needs_infer()
-            || t.has_erasable_regions()
-            || (t.has_closure_types() && self.infcx.in_progress_tables.is_some()))
-        {
+        if !t.needs_infer() && !t.has_erasable_regions() {
             return t;
         }
 

src/librustc_infer/infer/mod.rs

@@ -1482,12 +1482,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     ) -> bool {
         let ty = self.resolve_vars_if_possible(&ty);
 
-        // Even if the type may have no inference variables, during
-        // type-checking closure types are in local tables only.
-        if self.in_progress_tables.is_none() || !ty.has_closure_types() {
-            if !(param_env, ty).has_local_value() {
-                return ty.is_copy_modulo_regions(self.tcx, param_env, span);
-            }
+        if !(param_env, ty).has_local_value() {
+            return ty.is_copy_modulo_regions(self.tcx, param_env, span);
         }
 
         let copy_def_id = self.tcx.require_lang_item(lang_items::CopyTraitLangItem, None);

src/librustc_infer/infer/nll_relate/mod.rs

@@ -340,7 +340,7 @@ where
             // In NLL, we don't have type inference variables
             // floating around, so we can do this rather imprecise
             // variant of the occurs-check.
-            assert!(!generalized_ty.has_infer_types());
+            assert!(!generalized_ty.has_infer_types_or_consts());
         }
 
         self.infcx.inner.borrow_mut().type_variables.instantiate(vid, generalized_ty);

src/librustc_infer/infer/resolve.rs

@@ -28,7 +28,7 @@ impl<'a, 'tcx> TypeFolder<'tcx> for OpportunisticVarResolver<'a, 'tcx> {
     }
 
     fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {
-        if !t.has_infer_types() && !t.has_infer_consts() {
+        if !t.has_infer_types_or_consts() {
             t // micro-optimize -- if there is nothing in this type that this fold affects...
         } else {
             let t = self.infcx.shallow_resolve(t);
@@ -37,7 +37,7 @@ impl<'a, 'tcx> TypeFolder<'tcx> for OpportunisticVarResolver<'a, 'tcx> {
     }
 
     fn fold_const(&mut self, ct: &'tcx Const<'tcx>) -> &'tcx Const<'tcx> {
-        if !ct.has_infer_consts() {
+        if !ct.has_infer_types_or_consts() {
             ct // micro-optimize -- if there is nothing in this const that this fold affects...
         } else {
             let ct = self.infcx.shallow_resolve(ct);

src/librustc_infer/traits/error_reporting/mod.rs

@@ -647,7 +647,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                         }
 
                         // Try to report a help message
-                        if !trait_ref.has_infer_types()
+                        if !trait_ref.has_infer_types_or_consts()
                             && self.predicate_can_apply(obligation.param_env, trait_ref)
                         {
                             // If a where-clause may be useful, remind the

src/librustc_infer/traits/error_reporting/suggestions.rs

@@ -471,7 +471,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                 return;
             }
             let trait_ref = self.resolve_vars_if_possible(trait_ref);
-            if trait_ref.has_infer_types() {
+            if trait_ref.has_infer_types_or_consts() {
                 // Do not ICE while trying to find if a reborrow would succeed on a trait with
                 // unresolved bindings.
                 return;

src/librustc_infer/traits/fulfill.rs

@@ -299,7 +299,7 @@ impl<'a, 'b, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'b, 'tcx> {
 
         let obligation = &mut pending_obligation.obligation;
 
-        if obligation.predicate.has_infer_types() {
+        if obligation.predicate.has_infer_types_or_consts() {
             obligation.predicate =
                 self.selcx.infcx().resolve_vars_if_possible(&obligation.predicate);
         }
@@ -346,16 +346,7 @@ impl<'a, 'b, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'b, 'tcx> {
                         // This is a bit subtle: for the most part, the
                         // only reason we can fail to make progress on
                         // trait selection is because we don't have enough
-                        // information about the types in the trait. One
-                        // exception is that we sometimes haven't decided
-                        // what kind of closure a closure is. *But*, in
-                        // that case, it turns out, the type of the
-                        // closure will also change, because the closure
-                        // also includes references to its upvars as part
-                        // of its type, and those types are resolved at
-                        // the same time.
-                        //
-                        // FIXME(#32286) logic seems false if no upvars
+                        // information about the types in the trait.
                         pending_obligation.stalled_on =
                             trait_ref_type_vars(self.selcx, data.to_poly_trait_ref());
 

src/librustc_infer/traits/mod.rs

@@ -213,7 +213,7 @@ pub fn type_known_to_meet_bound_modulo_regions<'a, 'tcx>(
         result
     );
 
-    if result && (ty.has_infer_types() || ty.has_closure_types()) {
+    if result && ty.has_infer_types_or_consts() {
         // Because of inference "guessing", selection can sometimes claim
         // to succeed while the success requires a guess. To ensure
         // this function's result remains infallible, we must confirm