Add a hint of `ASCII-8BIT` being `BINARY`

[Feature #18576]

Since outright renaming `ASCII-8BIT` is deemed to backward incompatible,
the next best thing would be to only change its `#inspect`, particularly
in exception messages.

2 files changed, 3 insertions, 3 deletions

diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index 907360b3a6..a6493374b5 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -1091,7 +1091,7 @@ class TestM17N < Test::Unit::TestCase
     assert_nil(e("\xa1\xa2\xa3\xa4").rindex(e("\xa3")))
     s = e("\xa3\xb0\xa3\xb1\xa3\xb2\xa3\xb3\xa3\xb4")
 
-    a_with_e = /EUC-JP and ASCII-8BIT/
+    a_with_e = /EUC-JP and BINARY \(ASCII-8BIT\)/
     assert_raise_with_message(Encoding::CompatibilityError, a_with_e) do
       s.index(a("\xb1\xa3"))
     end
@@ -1099,7 +1099,7 @@ class TestM17N < Test::Unit::TestCase
       s.rindex(a("\xb1\xa3"))
     end
 
-    a_with_e = /ASCII-8BIT regexp with EUC-JP string/
+    a_with_e = /BINARY \(ASCII-8BIT\) regexp with EUC-JP string/
     assert_raise_with_message(Encoding::CompatibilityError, a_with_e) do
       s.index(Regexp.new(a("\xb1\xa3")))
     end
diff --git a/test/ruby/test_yjit.rb b/test/ruby/test_yjit.rb
index df71dbffc0..796787e355 100644
--- a/test/ruby/test_yjit.rb
+++ b/test/ruby/test_yjit.rb
@@ -1458,7 +1458,7 @@ class TestYJIT < Test::Unit::TestCase
   end
 
   def test_str_concat_encoding_mismatch
-    assert_compiles(<<~'RUBY', result: "incompatible character encodings: ASCII-8BIT and EUC-JP")
+    assert_compiles(<<~'RUBY', result: "incompatible character encodings: BINARY (ASCII-8BIT) and EUC-JP")
       def bar(a, b)
         a << b
       rescue => e