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  1. Groovy
  2. GROOVY-9340

Lambda using variable expression parameter produces generics error for self type

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 3.0.0-rc-2
    • Fix Version/s: 3.0.0-rc-3
    • Component/s: None
    • Labels:
      None

      Description

      Consider the following:

      @groovy.transform.CompileStatic
      class C {
        void m() {
          java.util.function.Consumer<C> consumer = c -> null
          consumer.accept(this)
        }
      }
      

      The lambda expression produces a compiler error:

      A transform used a generics containing ClassNode C for the method public void doCall(C c)  { ... } directly. You are not supposed to do this. Please create a new ClassNode referring to the old ClassNode and use the new ClassNode instead of the old one. Otherwise the compiler will create wrong descriptors and a potential NullPointerException in TypeResolver in the OpenJDK. If this is not your own doing, please report this bug to the writer of the transform.
           @ line 4, column 60.
             .function.Consumer<C> consumer = c -> null
                                           ^
      
          1 error
              at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:287)
              at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1091)
              at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:633)
              at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:612)
              at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:589)
              at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:367)
              at groovy.lang.GroovyClassLoader.lambda$parseClass$2(GroovyClassLoader.java:310)
              ...
      

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              • Assignee:
                emilles Eric Milles
                Reporter:
                emilles Eric Milles
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                  Resolved:

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