1 files changed, 358 insertions, 0 deletions
diff --git a/tests/ui/generics/wrong-number-of-args.rs b/tests/ui/generics/wrong-number-of-args.rs
new file mode 100644
index 000000000..cd2f96a18
--- /dev/null
+++ b/tests/ui/generics/wrong-number-of-args.rs
@@ -0,0 +1,358 @@
+mod no_generics {
+    struct Ty;
+
+    type A = Ty;
+
+    type B = Ty<'static>;
+    //~^ ERROR this struct takes 0 lifetime arguments but 1 lifetime argument
+    //~| HELP remove these generics
+
+    type C = Ty<'static, usize>;
+    //~^ ERROR this struct takes 0 lifetime arguments but 1 lifetime argument
+    //~| ERROR this struct takes 0 generic arguments but 1 generic argument
+    //~| HELP remove this lifetime argument
+    //~| HELP remove this generic argument
+
+    type D = Ty<'static, usize, { 0 }>;
+    //~^ ERROR this struct takes 0 lifetime arguments but 1 lifetime argument
+    //~| ERROR this struct takes 0 generic arguments but 2 generic arguments
+    //~| HELP remove this lifetime argument
+    //~| HELP remove these generic arguments
+}
+
+mod type_and_type {
+    struct Ty<A, B>;
+
+    type A = Ty;
+    //~^ ERROR missing generics for struct `type_and_type::Ty`
+    //~| HELP add missing
+
+    type B = Ty<usize>;
+    //~^ ERROR this struct takes 2 generic arguments but 1 generic argument
+    //~| HELP add missing
+
+    type C = Ty<usize, String>;
+
+    type D = Ty<usize, String, char>;
+    //~^ ERROR this struct takes 2 generic arguments but 3 generic arguments
+    //~| HELP remove this
+
+    type E = Ty<>;
+    //~^ ERROR this struct takes 2 generic arguments but 0 generic arguments were supplied
+    //~| HELP add missing
+}
+
+mod lifetime_and_type {
+    struct Ty<'a, T>;
+
+    type A = Ty;
+    //~^ ERROR missing generics for struct
+    //~| ERROR missing lifetime specifier
+    //~| HELP add missing
+    //~| HELP consider introducing
+
+    type B = Ty<'static>;
+    //~^ ERROR this struct takes 1 generic argument but 0 generic arguments
+    //~| HELP add missing
+
+    type C = Ty<usize>;
+    //~^ ERROR missing lifetime specifier
+    //~| HELP consider introducing
+
+    type D = Ty<'static, usize>;
+
+    type E = Ty<>;
+    //~^ ERROR this struct takes 1 generic argument but 0 generic arguments
+    //~| ERROR missing lifetime specifier
+    //~| HELP consider introducing
+    //~| HELP add missing
+
+    type F = Ty<'static, usize, 'static, usize>;
+    //~^ ERROR this struct takes 1 lifetime argument but 2 lifetime arguments
+    //~| ERROR this struct takes 1 generic argument but 2 generic arguments
+    //~| HELP remove this lifetime argument
+    //~| HELP remove this generic argument
+}
+
+mod type_and_type_and_type {
+    struct Ty<A, B, C = &'static str>;
+
+    type A = Ty;
+    //~^ ERROR missing generics for struct `type_and_type_and_type::Ty`
+    //~| HELP add missing
+
+    type B = Ty<usize>;
+    //~^ ERROR this struct takes at least 2
+    //~| HELP add missing
+
+    type C = Ty<usize, String>;
+
+    type D = Ty<usize, String, char>;
+
+    type E = Ty<usize, String, char, f64>;
+    //~^ ERROR this struct takes at most 3
+    //~| HELP remove
+
+    type F = Ty<>;
+    //~^ ERROR this struct takes at least 2 generic arguments but 0 generic arguments
+    //~| HELP add missing
+}
+
+// Traits have an implicit `Self` type - these tests ensure we don't accidentally return it
+// somewhere in the message
+mod r#trait {
+    trait NonGeneric {
+        //
+    }
+
+    trait GenericLifetime<'a> {
+        //
+    }
+
+    trait GenericType<A> {
+        //
+    }
+
+    type A = Box<dyn NonGeneric<usize>>;
+    //~^ ERROR this trait takes 0 generic arguments but 1 generic argument
+    //~| HELP remove
+
+    type B = Box<dyn GenericLifetime>;
+    //~^ ERROR missing lifetime specifier
+    //~| HELP consider introducing
+    //~| HELP consider making the bound lifetime-generic
+
+    type C = Box<dyn GenericLifetime<'static, 'static>>;
+    //~^ ERROR this trait takes 1 lifetime argument but 2 lifetime arguments were supplied
+    //~| HELP remove
+
+    type D = Box<dyn GenericType>;
+    //~^ ERROR missing generics for trait `GenericType`
+    //~| HELP add missing
+
+    type E = Box<dyn GenericType<String, usize>>;
+    //~^ ERROR this trait takes 1 generic argument but 2 generic arguments
+    //~| HELP remove
+
+    type F = Box<dyn GenericLifetime<>>;
+    //~^ ERROR missing lifetime specifier
+    //~| HELP consider introducing
+    //~| HELP consider making the bound lifetime-generic
+
+    type G = Box<dyn GenericType<>>;
+    //~^ ERROR this trait takes 1 generic argument but 0 generic arguments
+    //~| HELP add missing
+}
+
+mod associated_item {
+    mod non_generic {
+        trait NonGenericAT {
+            type AssocTy;
+        }
+
+        type A = Box<dyn NonGenericAT<usize, AssocTy=()>>;
+        //~^ ERROR this trait takes 0 generic arguments but 1 generic argument
+        //~| HELP remove
+    }
+
+    mod lifetime {
+        trait GenericLifetimeAT<'a> {
+            type AssocTy;
+        }
+
+        type A = Box<dyn GenericLifetimeAT<AssocTy=()>>;
+        //~^ ERROR missing lifetime specifier
+        //~| HELP consider introducing
+        //~| HELP consider making the bound lifetime-generic
+
+        type B = Box<dyn GenericLifetimeAT<'static, 'static, AssocTy=()>>;
+        //~^ ERROR this trait takes 1 lifetime argument but 2 lifetime arguments were supplied
+        //~| HELP remove
+
+        type C = Box<dyn GenericLifetimeAT<(), AssocTy=()>>;
+        //~^ ERROR missing lifetime specifier
+        //~| HELP consider introducing
+        //~| HELP consider making the bound lifetime-generic
+        //~| ERROR this trait takes 0 generic arguments but 1 generic argument
+        //~| HELP remove
+    }
+
+    mod r#type {
+        trait GenericTypeAT<A> {
+            type AssocTy;
+        }
+
+        type A = Box<dyn GenericTypeAT<AssocTy=()>>;
+        //~^ ERROR this trait takes 1 generic argument but 0 generic arguments
+        //~| HELP add missing
+
+        type B = Box<dyn GenericTypeAT<(), (), AssocTy=()>>;
+        //~^ ERROR this trait takes 1 generic argument but 2 generic arguments
+        //~| HELP remove
+
+        type C = Box<dyn GenericTypeAT<'static, AssocTy=()>>;
+        //~^ ERROR this trait takes 1 generic argument but 0 generic arguments
+        //~| HELP add missing
+        //~| ERROR this trait takes 0 lifetime arguments but 1 lifetime argument was supplied
+        //~| HELP remove
+    }
+
+    mod lifetime_and_type {
+        trait GenericLifetimeTypeAT<'a, A> {
+            type AssocTy;
+        }
+
+        type A = Box<dyn GenericLifetimeTypeAT<AssocTy=()>>;
+        //~^ ERROR this trait takes 1 generic argument but 0 generic arguments
+        //~| HELP add missing
+        //~| ERROR missing lifetime specifier
+        //~| HELP consider introducing
+        //~| HELP consider making the bound lifetime-generic
+
+        type B = Box<dyn GenericLifetimeTypeAT<'static, AssocTy=()>>;
+        //~^ ERROR this trait takes 1 generic argument but 0 generic arguments were supplied
+        //~| HELP add missing
+
+        type C = Box<dyn GenericLifetimeTypeAT<'static, 'static, AssocTy=()>>;
+        //~^ ERROR this trait takes 1 lifetime argument but 2 lifetime arguments were supplied
+        //~| HELP remove
+        //~| ERROR this trait takes 1 generic argument but 0 generic arguments
+        //~| HELP add missing
+
+        type D = Box<dyn GenericLifetimeTypeAT<(), AssocTy=()>>;
+        //~^ ERROR missing lifetime specifier
+        //~| HELP consider introducing
+        //~| HELP consider making the bound lifetime-generic
+
+        type E = Box<dyn GenericLifetimeTypeAT<(), (), AssocTy=()>>;
+        //~^ ERROR missing lifetime specifier
+        //~| HELP consider introducing
+        //~| HELP consider making the bound lifetime-generic
+        //~| ERROR this trait takes 1 generic argument but 2 generic arguments
+        //~| HELP remove
+
+        type F = Box<dyn GenericLifetimeTypeAT<'static, 'static, (), AssocTy=()>>;
+        //~^ ERROR this trait takes 1 lifetime argument but 2 lifetime arguments were supplied
+        //~| HELP remove
+
+        type G = Box<dyn GenericLifetimeTypeAT<'static, (), (), AssocTy=()>>;
+        //~^ ERROR this trait takes 1 generic argument but 2 generic arguments
+        //~| HELP remove
+
+        type H = Box<dyn GenericLifetimeTypeAT<'static, 'static, (), (), AssocTy=()>>;
+        //~^ ERROR this trait takes 1 lifetime argument but 2 lifetime arguments were supplied
+        //~| HELP remove
+        //~| ERROR this trait takes 1 generic argument but 2 generic arguments
+        //~| HELP remove
+    }
+
+    mod type_and_type {
+        trait GenericTypeTypeAT<A, B> {
+            type AssocTy;
+        }
+
+        type A = Box<dyn GenericTypeTypeAT<AssocTy=()>>;
+        //~^ ERROR this trait takes 2 generic arguments but 0 generic arguments
+        //~| HELP add missing
+
+        type B = Box<dyn GenericTypeTypeAT<(), AssocTy=()>>;
+        //~^ ERROR this trait takes 2 generic arguments but 1 generic argument
+        //~| HELP add missing
+
+        type C = Box<dyn GenericTypeTypeAT<(), (), (), AssocTy=()>>;
+        //~^ ERROR this trait takes 2 generic arguments but 3 generic arguments
+        //~| HELP remove
+    }
+
+    mod lifetime_and_lifetime {
+        trait GenericLifetimeLifetimeAT<'a, 'b> {
+            type AssocTy;
+        }
+
+        type A = Box<dyn GenericLifetimeLifetimeAT<AssocTy=()>>;
+        //~^ ERROR missing lifetime specifier
+        //~| HELP consider introducing
+        //~| HELP consider making the bound lifetime-generic
+
+        type B = Box<dyn GenericLifetimeLifetimeAT<'static, AssocTy=()>>;
+        //~^ ERROR this trait takes 2 lifetime arguments but 1 lifetime argument was supplied
+        //~| HELP add missing lifetime argument
+    }
+
+    mod lifetime_and_lifetime_and_type {
+        trait GenericLifetimeLifetimeTypeAT<'a, 'b, A> {
+            type AssocTy;
+        }
+
+        type A = Box<dyn GenericLifetimeLifetimeTypeAT<AssocTy=()>>;
+        //~^ ERROR missing lifetime specifier
+        //~| HELP consider introducing
+        //~| HELP consider making the bound lifetime-generic
+        //~| ERROR this trait takes 1 generic argument but 0 generic arguments
+        //~| HELP add missing
+
+        type B = Box<dyn GenericLifetimeLifetimeTypeAT<'static, AssocTy=()>>;
+        //~^ ERROR this trait takes 2 lifetime arguments but 1 lifetime argument was supplied
+        //~| HELP add missing lifetime argument
+        //~| ERROR this trait takes 1 generic argument but 0 generic arguments
+        //~| HELP add missing
+
+        type C = Box<dyn GenericLifetimeLifetimeTypeAT<'static, (), AssocTy=()>>;
+        //~^ ERROR this trait takes 2 lifetime arguments but 1 lifetime argument was supplied
+        //~| HELP add missing lifetime argument
+    }
+}
+
+mod stdlib {
+    mod hash_map {
+        use std::collections::HashMap;
+
+        type A = HashMap;
+        //~^ ERROR missing generics for struct `HashMap`
+        //~| HELP add missing
+
+        type B = HashMap<String>;
+        //~^ ERROR this struct takes at least
+        //~| HELP add missing
+
+        type C = HashMap<'static>;
+        //~^ ERROR this struct takes 0 lifetime arguments but 1 lifetime argument
+        //~| HELP remove these generics
+        //~| ERROR this struct takes at least 2
+        //~| HELP add missing
+
+        type D = HashMap<usize, String, char, f64>;
+        //~^ ERROR this struct takes at most 3
+        //~| HELP remove this
+
+        type E = HashMap<>;
+        //~^ ERROR this struct takes at least 2 generic arguments but 0 generic arguments
+        //~| HELP add missing
+    }
+
+    mod result {
+        type A = Result;
+        //~^ ERROR missing generics for enum `Result`
+        //~| HELP add missing
+
+        type B = Result<String>;
+        //~^ ERROR this enum takes 2 generic arguments but 1 generic argument
+        //~| HELP add missing
+
+        type C = Result<'static>;
+        //~^ ERROR this enum takes 0 lifetime arguments but 1 lifetime argument
+        //~| HELP remove these generics
+        //~| ERROR this enum takes 2 generic arguments but 0 generic arguments
+        //~| HELP add missing
+
+        type D = Result<usize, String, char>;
+        //~^ ERROR this enum takes 2 generic arguments but 3 generic arguments
+        //~| HELP remove
+
+        type E = Result<>;
+        //~^ ERROR this enum takes 2 generic arguments but 0 generic arguments
+        //~| HELP add missing
+    }
+}
+
+fn main() { }