1 files changed, 18 insertions, 0 deletions
diff --git a/spec/ruby/core/proc/shared/to_s.rb b/spec/ruby/core/proc/shared/to_s.rb
index c3f82a73f3..530eaff3a0 100644
--- a/spec/ruby/core/proc/shared/to_s.rb
+++ b/spec/ruby/core/proc/shared/to_s.rb
@@ -3,18 +3,30 @@ describe :proc_to_s, shared: true do
     it "returns a description optionally including file and line number" do
       Proc.new { "hello" }.send(@method).should =~ /^#<Proc:([^ ]*?)(@([^ ]*)\/to_s\.rb:4)?>$/
     end
+
+    it "has an ASCII-8BIT encoding" do
+      Proc.new { "hello" }.send(@method).encoding.should == Encoding::ASCII_8BIT
+    end
   end
 
   describe "for a proc created with lambda" do
     it "returns a description including '(lambda)' and optionally including file and line number" do
       lambda { "hello" }.send(@method).should =~ /^#<Proc:([^ ]*?)(@([^ ]*)\/to_s\.rb:10)? \(lambda\)>$/
     end
+
+    it "has an ASCII-8BIT encoding" do
+      lambda { "hello" }.send(@method).encoding.should == Encoding::ASCII_8BIT
+    end
   end
 
   describe "for a proc created with proc" do
     it "returns a description optionally including file and line number" do
       proc { "hello" }.send(@method).should =~ /^#<Proc:([^ ]*?)(@([^ ]*)\/to_s\.rb:16)?>$/
     end
+
+    it "has an ASCII-8BIT encoding" do
+      proc { "hello" }.send(@method).encoding.should == Encoding::ASCII_8BIT
+    end
   end
 
   describe "for a proc created with UnboundMethod#to_proc" do
@@ -23,5 +35,11 @@ describe :proc_to_s, shared: true do
 
       method("hello").to_proc.send(@method).should =~ /^#<Proc:([^ ]*?)(@([^ ]*)\/to_s\.rb:22)? \(lambda\)>$/
     end
+
+    it "has an ASCII-8BIT encoding" do
+      def hello; end
+
+      method("hello").to_proc.send(@method).encoding.should == Encoding::ASCII_8BIT
+    end
   end
 end