[GR-19220] Add alias String#dedup to String#-@ for Ruby v3.2

PullRequest: truffleruby/3818

CHANGELOG.md

@@ -8,12 +8,13 @@ Bug fixes:
 
 Compatibility:
 
-* Fix `Hash#shift` when Hash is empty but has initial default value or initial default proc (@itarato).
+* Fix `Hash#shift` when Hash is empty but has initial default value or initial default proc (#3039, @itarato).
 * Make `Array#shuffle` produce the same results as CRuby (@rwstauner).
 * Add `Process.argv0` method (@andrykonchin).
 * Add support for array pattern matching. This is opt-in via `--pattern-matching` since pattern matching is not fully supported yet. (#2683, @razetime).
-* Fix `Array#[]` with `ArithmeticSequence` argument when step is negative (@itarato).
-* Fix `Range#size` and return `nil` for beginningless Range when end isn't Numeric (@rwstauner).
+* Fix `Array#[]` with `ArithmeticSequence` argument when step is negative (#3039, @itarato).
+* Fix `Range#size` and return `nil` for beginningless Range when end isn't Numeric (#3039, @rwstauner).
+* Alias `String#-@` to `String#dedup` (#3039, @itarato).
 
 Performance:
 

spec/ruby/core/string/dedup_spec.rb

@@ -2,7 +2,7 @@
 require_relative 'shared/dedup'
 
 describe 'String#dedup' do
-  ruby_version_is '3.2'do
+  ruby_version_is '3.2' do
     it_behaves_like :string_dedup, :dedup
   end
 end

spec/tags/core/string/dedup_tags.txt

@@ -0,0 +1 @@
+fails:String#dedup interns the provided string if it is frozen

spec/truffle/methods/String.txt

@@ -31,6 +31,7 @@ codepoints
 concat
 count
 crypt
+dedup
 delete
 delete!
 delete_prefix

spec/truffleruby.next-specs

@@ -14,3 +14,5 @@ spec/ruby/core/array/element_reference_spec.rb
 
 spec/ruby/core/hash/shift_spec.rb
 spec/ruby/core/range/size_spec.rb
+
+spec/ruby/core/string/dedup_spec.rb

src/main/java/org/truffleruby/parser/BodyTranslator.java

@@ -491,7 +491,7 @@ public RubyNode visitCallNode(CallParseNode node) {
         final String methodName = node.getName();
 
         if (receiver instanceof StrParseNode &&
-                (methodName.equals("freeze") || methodName.equals("-@"))) {
+                (methodName.equals("freeze") || methodName.equals("-@") || methodName.equals("dedup"))) {
             final StrParseNode strNode = (StrParseNode) receiver;
             final TruffleString tstring = strNode.getValue();
             final ImmutableRubyString frozenString = language.getFrozenStringLiteral(tstring, strNode.encoding);

src/main/ruby/truffleruby/core/string.rb

@@ -1232,6 +1232,7 @@ def -@
       Primitive.string_intern(str)
     end
   end
+  alias_method :dedup, :-@
 
   def <=>(other)
     if Primitive.is_a?(other, String)

src/main/ruby/truffleruby/core/truffle/polyglot_methods.rb

@@ -148,6 +148,10 @@ def crypt(...)
       to_s.crypt(...)
     end
 
+    def dedup(...)
+      to_s.dedup(...)
+    end
+
     def delete(...)
       to_s.delete(...)
     end