+ String#{+|-}@ (Ruby 2.3)

README.rdoc

@@ -89,6 +89,8 @@ Compatible with Ruby itself, JRuby and Rubinius.
 * Numeric
   * +negative?+
   * +positive?+
+* String
+  * unary + and -
 * Struct
   * +dig+
 

lib/backports/2.3.0/string/uminus.rb

@@ -0,0 +1,7 @@
+unless String.method_defined? :-@
+  class String
+    def -@
+      frozen? ? self : dup.freeze
+    end
+  end
+end

lib/backports/2.3.0/string/uplus.rb

@@ -0,0 +1,7 @@
+unless String.method_defined? :+@
+  class String
+    def +@
+      frozen? ? dup : self
+    end
+  end
+end

spec/tags/1.8.6/core/string/uplus_spec.rb

@@ -0,0 +1 @@
+fails:String#+@ returns mutable copy despite freeze-magic-comment in file

spec/tags/1.8.7/core/string/uplus_spec.rb

@@ -0,0 +1 @@
+fails:String#+@ returns mutable copy despite freeze-magic-comment in file

spec/tags/1.9.1/core/string/uplus_spec.rb

@@ -0,0 +1 @@
+fails:String#+@ returns mutable copy despite freeze-magic-comment in file

spec/tags/1.9.2/core/string/uplus_spec.rb

@@ -0,0 +1 @@
+fails:String#+@ returns mutable copy despite freeze-magic-comment in file

spec/tags/2.0.0/core/string/uplus_spec.rb

@@ -0,0 +1 @@
+fails:String#+@ returns mutable copy despite freeze-magic-comment in file

spec/tags/2.1.0/core/string/uplus_spec.rb

@@ -0,0 +1 @@
+fails:String#+@ returns mutable copy despite freeze-magic-comment in file

spec/tags/2.2.0/core/string/uplus_spec.rb

@@ -0,0 +1 @@
+fails:String#+@ returns mutable copy despite freeze-magic-comment in file

spec/tags/2.3.0/core/string/uplus_spec.rb

@@ -0,0 +1 @@
+fails:String#+@ returns mutable copy despite freeze-magic-comment in file