From 6f79eb82f66952451dd972fbee08df169e2cfba6 Mon Sep 17 00:00:00 2001
From: Bobby McDonald <bobbymcwho@gmail.com>
Date: Sun, 12 Jan 2020 21:22:14 -0500
Subject: Only define compact on ruby >= 2.4

---
 CHANGELOG.md             |  1 +
 lib/hashie/mash.rb       | 12 ++++++------
 spec/hashie/mash_spec.rb | 42 +++++++++++++++++++++---------------------
 3 files changed, 28 insertions(+), 27 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1675557..665e6c4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@ scheme are considered to be bugs.
 * [#467](https://github.com/intridea/hashie/pull/467): Fixed `DeepMerge#deep_merge` mutating nested values within the receiver - [@michaelherold](https://github.com/michaelherold).
 * [#505](https://github.com/hashie/hashie/pull/505): Ensure that `Hashie::Array`s are not deconverted within `Hashie::Mash`es to make `Mash#dig` work properly - [@michaelherold](https://github.com/michaelherold).
 * [#507](https://github.com/hashie/hashie/pull/507): Suppress `Psych.safe_load` arg warn when using Psych 3.1.0+ - [@koic](https://github.com/koic).
+* [#510](https://github.com/hashie/hashie/pull/510): Ensure that `Hashie::Mash#compact` is only defined on Ruby version >= 2.4.0 - [@bobbymcwho](https://github.com/bobbymcwho).
 * Your contribution here.
 
 ### Security
diff --git a/lib/hashie/mash.rb b/lib/hashie/mash.rb
index 97d6fa6..658aded 100644
--- a/lib/hashie/mash.rb
+++ b/lib/hashie/mash.rb
@@ -173,12 +173,6 @@ module Hashie
       super(*keys.map { |key| convert_key(key) })
     end
 
-    # Returns a new instance of the class it was called on, with nil values
-    # removed.
-    def compact
-      self.class.new(super)
-    end
-
     # Returns a new instance of the class it was called on, using its keys as
     # values, and its values as keys. The new values and keys will always be
     # strings.
@@ -340,6 +334,12 @@ module Hashie
       def transform_values(&blk)
         self.class.new(super(&blk))
       end
+
+      # Returns a new instance of the class it was called on, with nil values
+      # removed.
+      def compact
+        self.class.new(super)
+      end
     end
 
     with_minimum_ruby('2.5.0') do
diff --git a/spec/hashie/mash_spec.rb b/spec/hashie/mash_spec.rb
index 4629124..603adc0 100644
--- a/spec/hashie/mash_spec.rb
+++ b/spec/hashie/mash_spec.rb
@@ -882,27 +882,6 @@ describe Hashie::Mash do
     end
   end
 
-  describe '#compact' do
-    subject(:mash) { described_class.new(a: 1, b: nil) }
-
-    it 'returns a Hashie::Mash' do
-      expect(mash.compact).to be_kind_of(described_class)
-    end
-
-    it 'removes keys with nil values' do
-      expect(mash.compact).to eq('a' => 1)
-    end
-
-    context 'when using with subclass' do
-      let(:subclass) { Class.new(Hashie::Mash) }
-      subject(:sub_mash) { subclass.new(a: 1, b: nil) }
-
-      it 'creates an instance of subclass' do
-        expect(sub_mash.compact).to be_kind_of(subclass)
-      end
-    end
-  end
-
   describe '#invert' do
     subject(:mash) { described_class.new(a: 'apple', b: 4) }
 
@@ -1027,6 +1006,27 @@ describe Hashie::Mash do
         end
       end
     end
+
+    describe '#compact' do
+      subject(:mash) { described_class.new(a: 1, b: nil) }
+
+      it 'returns a Hashie::Mash' do
+        expect(mash.compact).to be_kind_of(described_class)
+      end
+
+      it 'removes keys with nil values' do
+        expect(mash.compact).to eq('a' => 1)
+      end
+
+      context 'when using with subclass' do
+        let(:subclass) { Class.new(Hashie::Mash) }
+        subject(:sub_mash) { subclass.new(a: 1, b: nil) }
+
+        it 'creates an instance of subclass' do
+          expect(sub_mash.compact).to be_kind_of(subclass)
+        end
+      end
+    end
   end
 
   with_minimum_ruby('2.5.0') do
-- 
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