Report infer ty errors during hir ty lowering

compiler/rustc_hir/src/hir.rs

@@ -3151,6 +3151,15 @@ pub enum TraitItemKind<'hir> {
     /// type.
     Type(GenericBounds<'hir>, Option<&'hir Ty<'hir>>),
 }
+impl TraitItemKind<'_> {
+    pub fn descr(&self) -> &'static str {
+        match self {
+            TraitItemKind::Const(..) => "associated constant",
+            TraitItemKind::Fn(..) => "function",
+            TraitItemKind::Type(..) => "associated type",
+        }
+    }
+}
 
 // The bodies for items are stored "out of line", in a separate
 // hashmap in the `Crate`. Here we just record the hir-id of the item
@@ -3212,6 +3221,15 @@ pub enum ImplItemKind<'hir> {
     /// An associated type.
     Type(&'hir Ty<'hir>),
 }
+impl ImplItemKind<'_> {
+    pub fn descr(&self) -> &'static str {
+        match self {
+            ImplItemKind::Const(..) => "associated constant",
+            ImplItemKind::Fn(..) => "function",
+            ImplItemKind::Type(..) => "associated type",
+        }
+    }
+}
 
 /// A constraint on an associated item.
 ///
@@ -4537,6 +4555,16 @@ pub enum ForeignItemKind<'hir> {
     Type,
 }
 
+impl ForeignItemKind<'_> {
+    pub fn descr(&self) -> &'static str {
+        match self {
+            ForeignItemKind::Fn(..) => "function",
+            ForeignItemKind::Static(..) => "static variable",
+            ForeignItemKind::Type => "type",
+        }
+    }
+}
+
 /// A variable captured by a closure.
 #[derive(Debug, Copy, Clone, HashStable_Generic)]
 pub struct Upvar {

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -231,7 +231,6 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) -> Result<()
         item.name = ? tcx.def_path_str(def_id)
     );
     crate::collect::lower_item(tcx, item.item_id());
-    crate::collect::reject_placeholder_type_signatures_in_item(tcx, item);
 
     let res = match item.kind {
         // Right now we check that every default trait implementation