Fix const arguments not displaying in types mismatch diagnostic.

Author: skinnyBat

src/librustc/infer/error_reporting/mod.rs

@@ -935,6 +935,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                         .filter(|(a, b)| a == b)
                         .count();
                     let len = sub1.len() - common_default_params;
+                    let consts_offset = len - sub1.consts().count();
 
                     // Only draw `<...>` if there're lifetime/type arguments.
                     if len > 0 {
@@ -981,7 +982,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                     //         ^ elided type as this type argument was the same in both sides
                     let type_arguments = sub1.types().zip(sub2.types());
                     let regions_len = sub1.regions().count();
-                    for (i, (ta1, ta2)) in type_arguments.take(len).enumerate() {
+                    let num_display_types = consts_offset - regions_len;
+                    for (i, (ta1, ta2)) in type_arguments.take(num_display_types).enumerate() {
                         let i = i + regions_len;
                         if ta1 == ta2 {
                             values.0.push_normal("_");
@@ -994,6 +996,21 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                         self.push_comma(&mut values.0, &mut values.1, len, i);
                     }
 
+                    // Do the same for const arguments, if they are equal, do not highlight and
+                    // elide them from the output.
+                    let const_arguments = sub1.consts().zip(sub2.consts());
+                    for (i, (ca1, ca2)) in const_arguments.enumerate() {
+                        let i = i + consts_offset;
+                        if ca1 == ca2 {
+                            values.0.push_normal("_");
+                            values.1.push_normal("_");
+                        } else {
+                            values.0.push_highlighted(ca1.to_string());
+                            values.1.push_highlighted(ca2.to_string());
+                        }
+                        self.push_comma(&mut values.0, &mut values.1, len, i);
+                    }
+
                     // Close the type argument bracket.
                     // Only draw `<...>` if there're lifetime/type arguments.
                     if len > 0 {

src/test/ui/const-generics/slice-const-param-mismatch.stderr

@@ -12,26 +12,26 @@ error[E0308]: mismatched types
 LL |     let _: ConstString<"Hello"> = ConstString::<"World">;
    |                                   ^^^^^^^^^^^^^^^^^^^^^^ expected `"Hello"`, found `"World"`
    |
-   = note: expected type `ConstString<>`
-              found type `ConstString<>`
+   = note: expected type `ConstString<"Hello">`
+              found type `ConstString<"World">`
 
 error[E0308]: mismatched types
   --> $DIR/slice-const-param-mismatch.rs:11:33
    |
 LL |     let _: ConstString<"ℇ㇈↦"> = ConstString::<"ℇ㇈↥">;
    |                                  ^^^^^^^^^^^^^^^^^^^^^ expected `"ℇ㇈↦"`, found `"ℇ㇈↥"`
    |
-   = note: expected type `ConstString<>`
-              found type `ConstString<>`
+   = note: expected type `ConstString<"ℇ㇈↦">`
+              found type `ConstString<"ℇ㇈↥">`
 
 error[E0308]: mismatched types
   --> $DIR/slice-const-param-mismatch.rs:13:33
    |
 LL |     let _: ConstBytes<b"AAA"> = ConstBytes::<b"BBB">;
    |                                 ^^^^^^^^^^^^^^^^^^^^ expected `b"AAA"`, found `b"BBB"`
    |
-   = note: expected type `ConstBytes<>`
-              found type `ConstBytes<>`
+   = note: expected type `ConstBytes<b"AAA">`
+              found type `ConstBytes<b"BBB">`
 
 error: aborting due to 3 previous errors