GROOVY-11959: multi-assignment failure for singleton primitives

[paulk-asert]

No description provided.

[Copilot]

Pull request overview

Fixes GROOVY-11959 by ensuring multi-assignment/destructuring from primitive RHS values fails consistently (with a runtime MissingMethodException) rather than triggering bytecode verifier issues, aligning primitive behavior with boxed types.

Changes:

• Add regression tests covering multi-assignment from boxed Integer and primitive int/long/double.
• Box primitive RHS values in the multi-assignment path before storing into the temporary $rhs local, so later bytecode that assumes an object reference remains valid.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/test/groovy/gls/statements/MultipleAssignmentDeclarationTest.groovy	Adds GROOVY-11959 regression coverage for multi-assignment from singleton numeric values (boxed and primitive).
src/main/java/org/codehaus/groovy/classgen/asm/BinaryExpressionHelper.java	Boxes primitive RHS for tuple/multi-assignment before saving to $rhs, preventing invalid ALOAD/IF_ACMPEQ usage on primitive locals.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.0897%. Comparing base (815e756) to head (84be989).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2488        +/-   ##
==================================================
+ Coverage     67.0889%   67.0897%   +0.0008%     
- Complexity      31588      31589         +1     
==================================================
  Files            1451       1451                
  Lines          122530     122533         +3     
  Branches        21996      21997         +1     
==================================================
+ Hits            82204      82207         +3     
+ Misses          33245      33243         -2     
- Partials         7081       7083         +2     

Files with missing lines	Coverage Δ
...us/groovy/classgen/asm/BinaryExpressionHelper.java	89.7004% <100.0000%> (+0.0582%)	⬆️

... and 3 files with indirect coverage changes

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