Update to ruby/spec@89175b2

1 files changed, 4 insertions, 4 deletions

diff --git a/spec/ruby/core/io/read_nonblock_spec.rb b/spec/ruby/core/io/read_nonblock_spec.rb
index a62b75274c..51e7cd6bd2 100644
--- a/spec/ruby/core/io/read_nonblock_spec.rb
+++ b/spec/ruby/core/io/read_nonblock_spec.rb
@@ -96,21 +96,21 @@ describe "IO#read_nonblock" do
   end
 
   it "reads into the passed buffer" do
-    buffer = ""
+    buffer = +""
     @write.write("1")
     @read.read_nonblock(1, buffer)
     buffer.should == "1"
   end
 
   it "returns the passed buffer" do
-    buffer = ""
+    buffer = +""
     @write.write("1")
     output = @read.read_nonblock(1, buffer)
     output.should equal(buffer)
   end
 
   it "discards the existing buffer content upon successful read" do
-    buffer = "existing content"
+    buffer = +"existing content"
     @write.write("hello world")
     @write.close
     @read.read_nonblock(11, buffer)
@@ -118,7 +118,7 @@ describe "IO#read_nonblock" do
   end
 
   it "discards the existing buffer content upon error" do
-    buffer = "existing content"
+    buffer = +"existing content"
     @write.close
     -> { @read.read_nonblock(1, buffer) }.should raise_error(EOFError)
     buffer.should be_empty