Fix `Enumerator#(initialize|inspect)` for `nil`/`false`

2 files changed, 13 insertions, 12 deletions

diff --git a/mrbgems/mruby-enumerator/mrblib/enumerator.rb b/mrbgems/mruby-enumerator/mrblib/enumerator.rb
index cbf53974a..143f2b74f 100644
--- a/mrbgems/mruby-enumerator/mrblib/enumerator.rb
+++ b/mrbgems/mruby-enumerator/mrblib/enumerator.rb
@@ -109,11 +109,11 @@ class Enumerator
   #
   #     p fib.take(10) # => [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
   #
-  def initialize(obj=nil, meth=:each, *args, &block)
+  def initialize(obj=NONE, meth=:each, *args, &block)
     if block
       obj = Generator.new(&block)
-    else
-      raise ArgumentError unless obj
+    elsif obj == NONE
+      raise ArgumentError, "wrong number of arguments (given 0, expected 1+)"
     end
     if @obj and !self.respond_to?(meth)
       raise NoMethodError, "undefined method #{meth}"
@@ -221,13 +221,11 @@ class Enumerator
   end
 
   def inspect
-    return "#<#{self.class}: uninitialized>" unless @obj
-
     if @args && @args.size > 0
       args = @args.join(", ")
-      "#<#{self.class}: #{@obj}:#{@meth}(#{args})>"
+      "#<#{self.class}: #{@obj.inspect}:#{@meth}(#{args})>"
     else
-      "#<#{self.class}: #{@obj}:#{@meth}>"
+      "#<#{self.class}: #{@obj.inspect}:#{@meth}>"
     end
   end
 
diff --git a/mrbgems/mruby-enumerator/test/enumerator.rb b/mrbgems/mruby-enumerator/test/enumerator.rb
index f3bd1bdba..0d2a95292 100644
--- a/mrbgems/mruby-enumerator/test/enumerator.rb
+++ b/mrbgems/mruby-enumerator/test/enumerator.rb
@@ -21,6 +21,7 @@ assert 'Enumerator.new' do
   assert_equal [1,2,3], @obj.to_enum(:foo, 1,2,3).to_a
   assert_equal [1,2,3], Enumerator.new(@obj, :foo, 1,2,3).to_a
   assert_equal [1,2,3], Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.take(3)
+  assert_equal [], Enumerator.new(false, :__id__).to_a
   assert_raise(ArgumentError) { Enumerator.new }
   assert_raise(ArgumentError) { @obj.to_enum }
 
@@ -92,11 +93,13 @@ end
 
 assert 'Enumerator#inspect' do
   e = (0..10).each
-  assert_equal("#<Enumerator: 0..10:each>", e.inspect)
-  e = Enumerator.new("FooObject", :foo, 1)
-  assert_equal("#<Enumerator: FooObject:foo(1)>", e.inspect)
-  e = Enumerator.new("FooObject", :foo, 1, 2, 3)
-  assert_equal("#<Enumerator: FooObject:foo(1, 2, 3)>", e.inspect)
+  assert_equal('#<Enumerator: 0..10:each>', e.inspect)
+  e = Enumerator.new('FooObject', :foo, 1)
+  assert_equal('#<Enumerator: "FooObject":foo(1)>', e.inspect)
+  e = Enumerator.new('FooObject', :foo, 1, 2, 3)
+  assert_equal('#<Enumerator: "FooObject":foo(1, 2, 3)>', e.inspect)
+  e = Enumerator.new(nil, :to_s)
+  assert_equal('#<Enumerator: nil:to_s>', e.inspect)
 end
 
 assert 'Enumerator#each' do