Flatten ropes before interning them.

aardvark179 · aardvark179 · commit 75e9c62f0ff5 · 2019-05-08T11:29:55.000+01:00
diff --git a/src/main/ruby/core/string.rb b/src/main/ruby/core/string.rb
@@ -1591,6 +1591,7 @@ def +@
 
   def -@
     str = frozen? ? self : dup.freeze
+    Truffle::Ropes.flatten_rope(str)
     Truffle.invoke_primitive(:string_intern, str)
   end
 
