Shrink span to variant discriminant expression for E0081

src/test/compile-fail/E0081.rs

@@ -9,8 +9,10 @@
 // except according to those terms.
 
 enum Enum {
-    P = 3,
-    X = 3, //~ ERROR E0081
+    P = 3, //~ NOTE first use of `3isize`
+    X = 3,
+    //~^ ERROR discriminant value `3isize` already exists
+    //~| NOTE enum already has `3isize`
     Y = 5
 }
 

src/test/compile-fail/issue-15524.rs

@@ -12,17 +12,20 @@ const N: isize = 1;
 
 enum Foo {
     A = 1,
-    //~^ NOTE first use
-    //~| NOTE first use
-    //~| NOTE first use
-    B = 1, //~ ERROR discriminant value
-    //~^ NOTE enum already
+    //~^ NOTE first use of `1isize`
+    //~| NOTE first use of `1isize`
+    //~| NOTE first use of `1isize`
+    B = 1,
+    //~^ ERROR discriminant value `1isize` already exists
+    //~| NOTE enum already has `1isize`
     C = 0,
-    D, //~ ERROR discriminant value
-    //~^ NOTE enum already
+    D,
+    //~^ ERROR discriminant value `1isize` already exists
+    //~| NOTE enum already has `1isize`
 
-    E = N, //~ ERROR discriminant value
-    //~^ NOTE enum already
+    E = N,
+    //~^ ERROR discriminant value `1isize` already exists
+    //~| NOTE enum already has `1isize`
 
 }