Structure classes can now be initialized with hashes.

aws-sdk-core/lib/aws-sdk-core/structure.rb

@@ -8,6 +8,12 @@ class Structure < Struct
       alias orig_to_h to_h
     end
 
+    def initialize(values = {})
+      values.each do |k, v|
+        self[k] = v
+      end
+    end
+
     # @return [Boolean] Returns `true` if this structure has a value
     #   set for the given member.
     def key?(member_name)

aws-sdk-core/spec/aws/structure_spec.rb

@@ -11,14 +11,19 @@ module Aws
       expect(Structure.new(:abc, :xyz).members).to eq([:abc, :xyz])
     end
 
+    it 'accepts values to its constructor as a hash, not, positional' do
+      klass = Structure.new(:name)
+      expect(klass.new(name:'value').name).to eq('value')
+    end
+
     describe '#to_hash' do
 
       it 'returns a hash' do
         expect(Structure.new(:abc).new.to_hash).to eq({})
       end
 
       it 'only serializes non-nil members' do
-        s = Structure.new(:abc, :mno).new('abc')
+        s = Structure.new(:abc, :mno).new(abc:'abc')
         expect(s.to_hash).to eq(abc: 'abc')
       end