Update error message for E0243 and E0244

Author: Vincent Prouillet

src/librustc_typeck/astconv.rs

@@ -2248,20 +2248,27 @@ fn check_type_argument_count(tcx: TyCtxt, span: Span, supplied: usize,
         } else {
             "expected"
         };
-        span_err!(tcx.sess, span, E0243,
-                  "wrong number of type arguments: {} {}, found {}",
-                  expected, required, supplied);
+        struct_span_err!(tcx.sess, span, E0243, "wrong number of type arguments")
+            .span_label(
+                span,
+                &format!("{} {} type arguments, found {}", expected, required, supplied)
+            )
+            .emit();
     } else if supplied > accepted {
-        let expected = if required < accepted {
-            "expected at most"
+        let expected = if required == 0 {
+            "expected no".to_string()
+        } else if required < accepted {
+            format!("expected at most {}", accepted)
         } else {
-            "expected"
+            format!("expected {}", accepted)
         };
-        span_err!(tcx.sess, span, E0244,
-                  "wrong number of type arguments: {} {}, found {}",
-                  expected,
-                  accepted,
-                  supplied);
+
+        struct_span_err!(tcx.sess, span, E0244, "wrong number of type arguments")
+            .span_label(
+                span,
+                &format!("{} type arguments, found {}", expected, supplied)
+            )
+            .emit();
     }
 }
 

src/test/compile-fail/E0243.rs

@@ -9,7 +9,9 @@
 // except according to those terms.
 
 struct Foo<T> { x: T }
-struct Bar { x: Foo } //~ ERROR E0243
+struct Bar { x: Foo }
+                //~^ ERROR E0243
+                //~| NOTE expected 1 type arguments, found 0
 
 fn main() {
 }

src/test/compile-fail/E0244.rs

@@ -9,7 +9,10 @@
 // except according to those terms.
 
 struct Foo { x: bool }
-struct Bar<S, T> { x: Foo<S, T> } //~ ERROR E0244
+struct Bar<S, T> { x: Foo<S, T> }
+                      //~^ ERROR E0244
+                      //~| NOTE expected no type arguments, found 2
+
 
 fn main() {
 }

src/test/compile-fail/generic-type-less-params-with-defaults.rs

@@ -16,5 +16,7 @@ struct Vec<T, A = Heap>(
     marker::PhantomData<(T,A)>);
 
 fn main() {
-    let _: Vec; //~ ERROR wrong number of type arguments: expected at least 1, found 0
+    let _: Vec;
+    //~^ ERROR E0243
+    //~| NOTE expected at least 1 type arguments, found 0
 }

src/test/compile-fail/generic-type-more-params-with-defaults.rs

@@ -17,5 +17,6 @@ struct Vec<T, A = Heap>(
 
 fn main() {
     let _: Vec<isize, Heap, bool>;
-    //~^ ERROR wrong number of type arguments: expected at most 2, found 3
+    //~^ ERROR E0244
+    //~| NOTE expected at most 2 type arguments, found 3
 }

src/test/compile-fail/issue-14092.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-fn fn1(0: Box) {} //~ ERROR: wrong number of type arguments: expected 1, found 0
+fn fn1(0: Box) {}
+        //~^ ERROR E0243
+        //~| NOTE expected 1 type arguments, found 0
 
 fn main() {}

src/test/compile-fail/issue-23024.rs

@@ -18,6 +18,11 @@ fn main()
     vfnfer.push(box h);
     println!("{:?}",(vfnfer[0] as Fn)(3));
     //~^ ERROR the precise format of `Fn`-family traits'
-    //~| ERROR wrong number of type arguments: expected 1, found 0
+    //~| ERROR E0243
+    //~| NOTE expected 1 type arguments, found 0
     //~| ERROR the value of the associated type `Output` (from the trait `std::ops::FnOnce`)
+    //~| NOTE in this expansion of println!
+    //~| NOTE in this expansion of println!
+    //~| NOTE in this expansion of println!
+    //~| NOTE in this expansion of println!
 }

src/test/compile-fail/typeck-builtin-bound-type-parameters.rs

@@ -9,20 +9,25 @@
 // except according to those terms.
 
 fn foo1<T:Copy<U>, U>(x: T) {}
-//~^ ERROR: wrong number of type arguments: expected 0, found 1
+//~^ ERROR E0244
+//~| NOTE expected no type arguments, found 1
 
 trait Trait: Copy<Send> {}
-//~^ ERROR: wrong number of type arguments: expected 0, found 1
+//~^ ERROR E0244
+//~| NOTE expected no type arguments, found 1
 
 struct MyStruct1<T: Copy<T>>;
-//~^ ERROR wrong number of type arguments: expected 0, found 1
+//~^ ERROR E0244
+//~| NOTE expected no type arguments, found 1
 
 struct MyStruct2<'a, T: Copy<'a>>;
 //~^ ERROR: wrong number of lifetime parameters: expected 0, found 1
 
+
 fn foo2<'a, T:Copy<'a, U>, U>(x: T) {}
-//~^ ERROR: wrong number of type arguments: expected 0, found 1
-//~^^ ERROR: wrong number of lifetime parameters: expected 0, found 1
+//~^ ERROR E0244
+//~| NOTE expected no type arguments, found 1
+//~| ERROR: wrong number of lifetime parameters: expected 0, found 1
 
 fn main() {
 }

src/test/compile-fail/typeck_type_placeholder_lifetime_1.rs

@@ -17,5 +17,6 @@ struct Foo<'a, T:'a> {
 
 pub fn main() {
     let c: Foo<_, _> = Foo { r: &5 };
-    //~^ ERROR wrong number of type arguments: expected 1, found 2
+    //~^ ERROR E0244
+    //~| NOTE expected 1 type arguments, found 2
 }

src/test/compile-fail/typeck_type_placeholder_lifetime_2.rs

@@ -17,5 +17,6 @@ struct Foo<'a, T:'a> {
 
 pub fn main() {
     let c: Foo<_, usize> = Foo { r: &5 };
-    //~^ ERROR wrong number of type arguments: expected 1, found 2
+    //~^ ERROR E0244
+    //~| NOTE expected 1 type arguments, found 2
 }

src/test/compile-fail/unboxed-closure-sugar-wrong-trait.rs

@@ -13,7 +13,8 @@
 trait Trait {}
 
 fn f<F:Trait(isize) -> isize>(x: F) {}
-//~^ ERROR wrong number of type arguments: expected 0, found 1
+//~^ ERROR E0244
+//~| NOTE expected no type arguments, found 1
 //~| ERROR associated type `Output` not found
 
 fn main() {}