GROOVY-12228: STC: multiple assignment ignores the declared type of t…

[paulk-asert]

…he target variables

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.9755%. Comparing base (7a34d45) to head (a05304a).

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2759        +/-   ##
==================================================
+ Coverage     69.9738%   69.9755%   +0.0017%     
+ Complexity      35505      35504         -1     
==================================================
  Files            1557       1557                
  Lines          131675     131679         +4     
  Branches        24169      24170         +1     
==================================================
+ Hits            92138      92143         +5     
- Misses          31193      31194         +1     
+ Partials         8344       8342         -2     

Files with missing lines	Coverage Δ
...roovy/transform/stc/StaticTypeCheckingVisitor.java	87.4618% <100.0000%> (+0.0128%)	⬆️

... and 7 files with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: a05304a
▶️ Tests: 108573 executed
⚪️ Checks: 31/31 completed

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[Copilot]

Pull request overview

Addresses GROOVY-12228 by making static type checking for positional multiple assignment preserve the declared type of each target variable when the RHS requires implicit conversion/coercion, aligning multi-assignment behavior with single-assignment STC typing.

Changes:

• Update typeCheckMultipleAssignmentPositional to store the LHS declared/origin type (instead of the raw RHS value type) when assignment relies on implicit conversion (e.g., GString -> String, Integer -> Long).
• Add regression tests covering multi-assignment into pre-declared typed variables and typed tuple-declaration forms.

Reviewed changes

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

File	Description
src/test/groovy/groovy/transform/stc/STCAssignmentTest.groovy	Adds GROOVY-12228 regression tests ensuring multi-assignment retains declared target types (e.g., String, Long).
src/main/java/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java	Adjusts STC multi-assignment positional typing to prefer original declared types when implicit conversion is involved.