diff --git a/meta/block.rb b/meta/block.rb
index d06e2ab7b..ed67d067c 100644
--- a/meta/block.rb
+++ b/meta/block.rb
@@ -79,16 +79,6 @@
   mutation 'foo'
 end
 
-Mutant::Meta::Example.add :block do
-  source 'foo { |a| }'
-
-  singleton_mutations
-  mutation 'foo { || }'
-  mutation 'foo { |a| raise }'
-  mutation 'foo { |_a| }'
-  mutation 'foo'
-end
-
 Mutant::Meta::Example.add :block do
   source 'foo { bar(nil) }'
 
diff --git a/meta/send.rb b/meta/send.rb
index 74402122b..d384dae51 100644
--- a/meta/send.rb
+++ b/meta/send.rb
@@ -219,21 +219,6 @@
   mutation 'true'
 end
 
-Mutant::Meta::Example.add :send do
-  source 'foo.is_a?(bar)'
-
-  singleton_mutations
-  mutation 'foo'
-  mutation 'bar'
-  mutation 'foo.is_a?'
-  mutation 'foo.is_a?(nil)'
-  mutation 'foo.is_a?(self)'
-  mutation 'self.is_a?(bar)'
-  mutation 'foo.instance_of?(bar)'
-  mutation 'false'
-  mutation 'true'
-end
-
 Mutant::Meta::Example.add :send do
   source 'foo.kind_of?(bar)'
 
diff --git a/spec/unit/mutant/meta/example_spec.rb b/spec/unit/mutant/meta/example_spec.rb
index da187495e..9b4c933ef 100644
--- a/spec/unit/mutant/meta/example_spec.rb
+++ b/spec/unit/mutant/meta/example_spec.rb
@@ -30,6 +30,14 @@
     end
   end
 
+  it 'does not define any repeated examples' do
+    source_counts = described_class::ALL.each_with_object(Hash.new(0)) do |example, counts|
+      counts["#{example.location.path}:#{example.original_source}"] += 1
+    end
+
+    expect(source_counts.select { |_source, count| count > 1 }.keys).to eql([])
+  end
+
   describe '#original_source_generated' do
     subject { object.original_source_generated }