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https://issues.apache.org/jira/browse/GROOVY-11831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18050363#comment-18050363
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ASF GitHub Bot commented on GROOVY-11831:
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ayoube-ait closed pull request #2362: GROOVY-11831: fix TYPE_USE annotation
crash on void method return type
URL: https://github.com/apache/groovy/pull/2362
> Compiler crash with TYPE_USE annotation on void method during AST
> transformation
> --------------------------------------------------------------------------------
>
> Key: GROOVY-11831
> URL: https://issues.apache.org/jira/browse/GROOVY-11831
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 5.0.0, 5.0.3
> Reporter: Ayoub Ait Abdellah
> Priority: Blocker
> Labels: ast, compiler
>
> h2. Summary
> Groovy 5 compiler crashes during class generation when an AST transformation
> adds an annotation (without explicit {{{}@Target{}}}) to a method that
> returns {{{}void{}}}.
> h2. Error Message
> {code:java}
> BUG! exception in phase 'class generation' in source unit '...'
> Adding type annotation @MyAnnotation to non-redirect node: void
> {code}
> h2. Affected Versions
> Tested and confirmed on 5.0.0 and 5.0.3 (latest). Bug is present in all
> Groovy 5.x releases.
> h2. Minimal Reproduction
> {code:bash}
> git clone https://github.com/ayoube-ait/groovy-bug-repro.git
> cd groovy-bug-repro
> ./gradlew clean :groovy-app:compileGroovy
> {code}
> Repository: [https://github.com/ayoube-ait/groovy-bug-repro]
> h2. Root Cause
> # An annotation is defined without explicit {{@Target}} (defaults to all
> targets including {{{}TYPE_USE{}}})
> # An AST transformation creates a method with {{ClassHelper.VOID_TYPE}}
> return type
> # The transformation adds the annotation to this void method
> # During class generation, {{ExtendedVerifier.extractTypeUseAnnotations()}}
> attempts to process the annotation as {{TYPE_USE}}
> # It tries to call {{addTypeAnnotations()}} on the {{void}} return type
> # {{void}} is a "non-redirect node" causing the crash
> h2. Expected Behavior
> The compiler should skip TYPE_USE annotation processing for {{void}} return
> types instead of crashing.
> h2. Related Issues
> GROOVY-11479 - Similar crash with TYPE_USE annotations on lambda parameters
> (fixed in 5.0.0-alpha-11). That fix addressed lambda parameters but not void
> return types in AST-generated methods.
> h2. Impact
> This bug affects Micronaut Framework's Groovy support. The {{@Internal}}
> annotation in micronaut-core has no explicit {{@Target}} and is used in AST
> transformations that generate void methods, preventing Groovy function
> scripts from compiling with Micronaut 5 + Groovy 5.
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