Extend support of _ in type parameters

src/librustc_parse/parser/generics.rs

@@ -156,7 +156,7 @@ impl<'a> Parser<'a> {
             self.expect_gt()?;
             (params, span_lo.to(self.prev_span))
         } else {
-            (vec![], self.prev_span.between(self.token.span))
+            (vec![], self.prev_span.shrink_to_hi())
         };
         Ok(ast::Generics {
             params,

src/librustc_parse/parser/item.rs

@@ -555,7 +555,11 @@ impl<'a> Parser<'a> {
         let mut generics = if self.choose_generics_over_qpath() {
             self.parse_generics()?
         } else {
-            Generics::default()
+            let mut generics = Generics::default();
+            // impl A for B {}
+            //    /\ this is where `generics.span` should point when there are no type params.
+            generics.span = self.prev_span.shrink_to_hi();
+            generics
         };
 
         // Disambiguate `impl !Trait for Type { ... }` and `impl ! { ... }` for the never type.

src/librustc_typeck/astconv.rs

@@ -2803,7 +2803,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             // allowed. `allow_ty_infer` gates this behavior.
             crate::collect::placeholder_type_error(
                 tcx,
-                ident_span.unwrap_or(DUMMY_SP),
+                ident_span.map(|sp| sp.shrink_to_hi()).unwrap_or(DUMMY_SP),
                 generic_params,
                 visitor.0,
                 ident_span.is_some(),

src/librustc_typeck/collect.rs

@@ -124,7 +124,7 @@ struct CollectItemTypesVisitor<'tcx> {
 /// all already existing generic type parameters to avoid suggesting a name that is already in use.
 crate fn placeholder_type_error(
     tcx: TyCtxt<'tcx>,
-    ident_span: Span,
+    span: Span,
     generics: &[hir::GenericParam<'_>],
     placeholder_types: Vec<Span>,
     suggest: bool,
@@ -150,7 +150,14 @@ crate fn placeholder_type_error(
     let mut sugg: Vec<_> =
         placeholder_types.iter().map(|sp| (*sp, type_name.to_string())).collect();
     if generics.is_empty() {
-        sugg.push((ident_span.shrink_to_hi(), format!("<{}>", type_name)));
+        sugg.push((span, format!("<{}>", type_name)));
+    } else if let Some(arg) = generics.iter().find(|arg| match arg.name {
+        hir::ParamName::Plain(Ident { name: kw::Underscore, .. }) => true,
+        _ => false,
+    }) {
+        // Account for `_` already present in cases like `struct S<_>(_);` and suggest
+        // `struct S<T>(T);` instead of `struct S<_, T>(T);`.
+        sugg.push((arg.span, format!("{}", type_name)));
     } else {
         sugg.push((
             generics.iter().last().unwrap().span.shrink_to_hi(),
@@ -172,16 +179,20 @@ fn reject_placeholder_type_signatures_in_item(tcx: TyCtxt<'tcx>, item: &'tcx hir
     let (generics, suggest) = match &item.kind {
         hir::ItemKind::Union(_, generics)
         | hir::ItemKind::Enum(_, generics)
-        | hir::ItemKind::Struct(_, generics) => (&generics.params[..], true),
-        hir::ItemKind::TyAlias(_, generics) => (&generics.params[..], false),
+        | hir::ItemKind::TraitAlias(generics, _)
+        | hir::ItemKind::Trait(_, _, generics, ..)
+        | hir::ItemKind::Impl(_, _, _, generics, ..)
+        | hir::ItemKind::Struct(_, generics) => (generics, true),
+        hir::ItemKind::OpaqueTy(hir::OpaqueTy { generics, .. })
+        | hir::ItemKind::TyAlias(_, generics) => (generics, false),
         // `static`, `fn` and `const` are handled elsewhere to suggest appropriate type.
         _ => return,
     };
 
     let mut visitor = PlaceholderHirTyCollector::default();
     visitor.visit_item(item);
 
-    placeholder_type_error(tcx, item.ident.span, generics, visitor.0, suggest);
+    placeholder_type_error(tcx, generics.span, &generics.params[..], visitor.0, suggest);
 }
 
 impl Visitor<'tcx> for CollectItemTypesVisitor<'tcx> {
@@ -1789,10 +1800,19 @@ fn find_opaque_ty_constraints(tcx: TyCtxt<'_>, def_id: DefId) -> Ty<'_> {
 /// Whether `ty` is a type with `_` placeholders that can be infered. Used in diagnostics only to
 /// use inference to provide suggestions for the appropriate type if possible.
 fn is_suggestable_infer_ty(ty: &hir::Ty<'_>) -> bool {
+    use hir::TyKind::*;
     match &ty.kind {
-        hir::TyKind::Infer => true,
-        hir::TyKind::Slice(ty) | hir::TyKind::Array(ty, _) => is_suggestable_infer_ty(ty),
-        hir::TyKind::Tup(tys) => tys.iter().any(|ty| is_suggestable_infer_ty(ty)),
+        Infer => true,
+        Slice(ty) | Array(ty, _) => is_suggestable_infer_ty(ty),
+        Tup(tys) => tys.iter().any(is_suggestable_infer_ty),
+        Ptr(mut_ty) | Rptr(_, mut_ty) => is_suggestable_infer_ty(mut_ty.ty),
+        Def(_, generic_args) => generic_args
+            .iter()
+            .filter_map(|arg| match arg {
+                hir::GenericArg::Type(ty) => Some(ty),
+                _ => None,
+            })
+            .any(is_suggestable_infer_ty),
         _ => false,
     }
 }

src/test/ui/typeck/typeck_type_placeholder_item.rs

@@ -1,3 +1,4 @@
+#![feature(type_alias_impl_trait)] // Needed for single test `type Y = impl Trait<_>`
 // This test checks that it is not possible to enable global type
 // inference by using the `_` type placeholder.
 
@@ -42,6 +43,16 @@ impl Test9 {
     //~^ ERROR the type placeholder `_` is not allowed within types on item signatures
 }
 
+fn test11(x: &usize) -> &_ {
+//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
+    &x
+}
+
+unsafe fn test12(x: *const usize) -> *const *const _ {
+//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
+    &x
+}
+
 impl Clone for Test9 {
     fn clone(&self) -> _ { Test9 }
     //~^ ERROR the type placeholder `_` is not allowed within types on item signatures
@@ -131,3 +142,37 @@ trait T {
     fn assoc_fn_test3() -> _;
     //~^ ERROR the type placeholder `_` is not allowed within types on item signatures
 }
+
+struct BadStruct<_>(_);
+//~^ ERROR expected identifier, found reserved identifier `_`
+//~| ERROR the type placeholder `_` is not allowed within types on item signatures
+trait BadTrait<_> {}
+//~^ ERROR expected identifier, found reserved identifier `_`
+impl BadTrait<_> for BadStruct<_> {}
+//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
+
+fn impl_trait() -> impl BadTrait<_> {
+//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
+    unimplemented!()
+}
+
+struct BadStruct1<_, _>(_);
+//~^ ERROR expected identifier, found reserved identifier `_`
+//~| ERROR expected identifier, found reserved identifier `_`
+//~| ERROR the name `_` is already used
+//~| ERROR the type placeholder `_` is not allowed within types on item signatures
+struct BadStruct2<_, T>(_, T);
+//~^ ERROR expected identifier, found reserved identifier `_`
+//~| ERROR the type placeholder `_` is not allowed within types on item signatures
+
+type X = Box<_>;
+//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
+
+struct Struct;
+trait Trait<T> {}
+impl Trait<usize> for Struct {}
+type Y = impl Trait<_>;
+//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
+fn foo() -> Y {
+    Struct
+}