Show number in error message even for one error

Co-authored-by: Adrian <adrian.iosdev@gmail.com>

tests/ui/codemap_tests/coherence-overlapping-inherent-impl-trait.stderr

@@ -6,6 +6,6 @@ LL | impl dyn C { fn f() {} }
 LL | impl dyn C { fn f() {} }
    |              ------ other definition for `f`
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0592`.

tests/ui/codemap_tests/empty_span.stderr

@@ -4,6 +4,6 @@ error[E0321]: cross-crate traits with a default impl, like `Send`, can only be i
 LL |     unsafe impl Send for &'static Foo { }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't implement cross-crate trait with a default impl for non-struct/enum type
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0321`.

tests/ui/codemap_tests/huge_multispan_highlight.stderr

@@ -9,6 +9,6 @@ help: consider changing this to be mutable
 LL |     let mut x = "foo";
    |         +++
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0596`.

tests/ui/codemap_tests/issue-11715.stderr

@@ -9,6 +9,6 @@ LL |     z.use_mut();
 LL |     y.use_mut();
    |     - first borrow later used here
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0499`.

tests/ui/codemap_tests/issue-28308.stderr

@@ -6,6 +6,6 @@ LL |     assert!("foo");
    |
    = note: this error originates in the macro `assert` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0600`.

tests/ui/codemap_tests/one_line.stderr

@@ -18,6 +18,6 @@ help: ...and then using that local as the argument to this call
 LL |     v.push(v.pop().unwrap());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0499`.

tests/ui/codemap_tests/tab_2.stderr

@@ -6,6 +6,6 @@ LL |                   """;
 LL | | }
    | |__^
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0765`.

tests/ui/codemap_tests/tab_3.stderr

@@ -17,6 +17,6 @@ help: you can `clone` the value and consume it, but this might not be your desir
 LL |     some_vec.clone().into_iter();
    |             ++++++++
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0382`.

tests/ui/codemap_tests/two_files.stderr

@@ -10,6 +10,6 @@ help: you might have meant to use `#![feature(trait_alias)]` instead of a `type`
 LL | trait Bar = dyn Foo;
    |
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0404`.

tests/ui/codemap_tests/unicode.normal.stderr

@@ -6,6 +6,6 @@ LL | extern "路濫狼á́́" fn foo() {}
    |
    = note: invoke `rustc --print=calling-conventions` for a full list of supported calling conventions.
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0703`.