1 files changed, 55 insertions, 7 deletions
diff --git a/test/ruby/test_pattern_matching.rb b/test/ruby/test_pattern_matching.rb
index 7531466f91..cfe3bd1e19 100644
--- a/test/ruby/test_pattern_matching.rb
+++ b/test/ruby/test_pattern_matching.rb
@@ -9,14 +9,14 @@ class TestPatternMatching < Test::Unit::TestCase
   end
 
   def setup
-    if defined?(DidYouMean)
+    if defined?(DidYouMean.formatter=nil)
       @original_formatter = DidYouMean.formatter
       DidYouMean.formatter = NullFormatter.new
     end
   end
 
   def teardown
-    if defined?(DidYouMean)
+    if defined?(DidYouMean.formatter=nil)
       DidYouMean.formatter = @original_formatter
     end
   end
@@ -109,16 +109,12 @@ class TestPatternMatching < Test::Unit::TestCase
     end
 
     assert_block do
-      # suppress "warning: Pattern matching is experimental, and the behavior may change in future versions of Ruby!"
-      experimental, Warning[:experimental] = Warning[:experimental], false
       eval(%q{
         case true
         in a
           a
         end
       })
-    ensure
-      Warning[:experimental] = experimental
     end
 
     assert_block do
@@ -358,6 +354,14 @@ END
     end
 
     assert_block do
+      a = "abc"
+      case 'abc'
+      in /#{a}/o
+        true
+      end
+    end
+
+    assert_block do
       case 0
       in ->(i) { i == 0 }
         true
@@ -464,6 +468,8 @@ END
         true
       end
     end
+
+    assert_valid_syntax("1 in ^(1\n)")
   end
 
   def test_array_pattern
@@ -798,6 +804,10 @@ END
         true
       end
     end
+
+    assert_syntax_error(%q{
+      0 => [a, *a]
+    }, /duplicated variable name/)
   end
 
   def test_find_pattern
@@ -866,6 +876,10 @@ END
         false
       end
     end
+
+    assert_syntax_error(%q{
+      0 => [*a, a, b, *b]
+    }, /duplicated variable name/)
   end
 
   def test_hash_pattern
@@ -1155,6 +1169,28 @@ END
       end
     end
 
+    bug18890 = assert_warning(/(?:.*:[47]: warning: possibly useless use of a literal in void context\n){2}/) do
+      eval("#{<<~';;;'}")
+      proc do |i|
+        case i
+        in a:
+          0 # line 4
+          a
+        in "b":
+          0 # line 7
+          b
+        else
+          false
+        end
+      end
+      ;;;
+    end
+    [{a: 42}, {b: 42}].each do |i|
+      assert_block('newline should be significant after pattern label') do
+        bug18890.call(i)
+      end
+    end
+
     assert_syntax_error(%q{
       case _
       in a:, a:
@@ -1295,7 +1331,7 @@ END
     end
 
     assert_block do
-      case {}
+      case C.new({})
       in {}
         C.keys == nil
       end
@@ -1548,6 +1584,18 @@ END
     assert_equal false, (1 in 2)
   end
 
+  def test_bug18990
+    {a: 0} => a:
+    assert_equal 0, a
+    {a: 0} => a:
+    assert_equal 0, a
+
+    {a: 0} in a:
+    assert_equal 0, a
+    {a: 0} in a:
+    assert_equal 0, a
+  end
+
   ################################################################
 
   def test_single_pattern_error_value_pattern