Index: lib/rubygems/version.rb
===================================================================
--- lib/rubygems/version.rb	(revision 43039)
+++ lib/rubygems/version.rb	(working copy)
@@ -148,7 +148,7 @@ class Gem::Version
   # FIX: These are only used once, in .correct?. Do they deserve to be
   # constants?
   VERSION_PATTERN = '[0-9]+(?>\.[0-9a-zA-Z]+)*' # :nodoc:
-  ANCHORED_VERSION_PATTERN = /\A\s*(#{VERSION_PATTERN})*\s*\z/ # :nodoc:
+  ANCHORED_VERSION_PATTERN = /\A\s*(#{VERSION_PATTERN})?\s*\z/ # :nodoc:
 
   ##
   # A string representation of this Version.
Index: test/rubygems/test_gem_requirement.rb
===================================================================
--- test/rubygems/test_gem_requirement.rb	(revision 43039)
+++ test/rubygems/test_gem_requirement.rb	(working copy)
@@ -47,18 +47,20 @@ class TestGemRequirement < Gem::TestCase
   end
 
   def test_parse_bad
-    e = assert_raises Gem::Requirement::BadRequirementError do
-      Gem::Requirement.parse nil
-    end
-
-    assert_equal 'Illformed requirement [nil]', e.message
+    [
+      nil,
+      '',
+      '! 1',
+      '= junk',
+      '1..2',
+    ].each do |bad|
+      e = assert_raises Gem::Requirement::BadRequirementError do
+        Gem::Requirement.parse bad
+      end
 
-    e = assert_raises Gem::Requirement::BadRequirementError do
-      Gem::Requirement.parse ""
+      assert_equal "Illformed requirement [#{bad.inspect}]", e.message
     end
 
-    assert_equal 'Illformed requirement [""]', e.message
-
     assert_equal Gem::Requirement::BadRequirementError.superclass, ArgumentError
   end
 
Index: test/rubygems/test_gem_version.rb
===================================================================
--- test/rubygems/test_gem_version.rb	(revision 43039)
+++ test/rubygems/test_gem_version.rb	(working copy)
@@ -67,12 +67,18 @@ class TestGemVersion < Gem::TestCase
   end
 
   def test_initialize_bad
-    ["junk", "1.0\n2.0"].each do |bad|
-      e = assert_raises ArgumentError do
+    %W[
+      junk
+      1.0\n2.0
+      1..2
+      1.2\ 3.4
+      1-2-3
+    ].each do |bad|
+      e = assert_raises ArgumentError, bad do
         Gem::Version.new bad
       end
 
-      assert_equal "Malformed version number string #{bad}", e.message
+      assert_equal "Malformed version number string #{bad}", e.message, bad
     end
   end