[GROOVY-10230] Unexpected generics parameter arity mismatch in the "instruction selection" phase

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-beta-2, 3.0.11, 2.5.19
• Assignee: Eric Milles
• Reporter: Thodoris Sotiropoulos
• Created: 13/Sep/21 12:39
• Updated: 13/Sep/22 19:07
• Resolved: 04/Nov/21 16:37

Description

The following program

class Foo<T1, T2> {}
class A {
  <T extends Foo<Number, Number>> T m(T x) {
    x
  }
}
class B extends A {
  <T extends Foo<Number, Number>> T m(T x) {
    T z = null;
    super.m((true) ? z : z)
  }
}

crashes the compiler and produces the following stack trace

>>> a serious error occurred: BUG! exception in phase 'instruction selection' in source unit 'test.groovy' Expected earlier checking to detect generics parameter arity mismatch
Expected: Foo<T1,T2>
Supplied: Foo<T>
>>> stacktrace:
BUG! exception in phase 'instruction selection' in source unit 'test.groovy' Expected earlier checking to detect generics parameter arity mismatch
Expected: Foo<T1,T2>
Supplied: Foo<T>
        at org.codehaus.groovy.ast.tools.GenericsUtils.extractPlaceholders(GenericsUtils.java:195)
        at org.codehaus.groovy.ast.tools.GenericsUtils.extractPlaceholders(GenericsUtils.java:146)
        at org.codehaus.groovy.ast.GenericsType.compareGenericsWithBound(GenericsType.java:384)
        at org.codehaus.groovy.ast.GenericsType.checkGenerics(GenericsType.java:308)
        at org.codehaus.groovy.ast.GenericsType.isCompatibleWith(GenericsType.java:259)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.applyGenericsConnections(StaticTypeCheckingSupport.java:1610)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.inferReturnTypeGenerics(StaticTypeCheckingVisitor.java:5323)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitMethodCallExpression(StaticTypeCheckingVisitor.java:3578)
        at org.codehaus.groovy.transform.sc.StaticCompilationVisitor.visitMethodCallExpression(StaticCompilationVisitor.java:414)
        at org.codehaus.groovy.ast.expr.MethodCallExpression.visit(MethodCallExpression.java:77)
        at org.codehaus.groovy.ast.CodeVisitorSupport.visitExpressionStatement(CodeVisitorSupport.java:117)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitExpressionStatement(ClassCodeVisitorSupport.java:204)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitExpressionStatement(StaticTypeCheckingVisitor.java:2169)
        at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:41)
        at org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:86)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:168)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitBlockStatement(StaticTypeCheckingVisitor.java:3992)
        at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:70)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:142)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:115)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitConstructorOrMethod(StaticTypeCheckingVisitor.java:2602)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:110)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.startMethodInference(StaticTypeCheckingVisitor.java:2591)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitMethod(StaticTypeCheckingVisitor.java:2565)
        at org.codehaus.groovy.transform.sc.StaticCompilationVisitor.visitMethod(StaticCompilationVisitor.java:239)
        at org.codehaus.groovy.ast.ClassNode.visitMethods(ClassNode.java:1131)
        at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1124)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:52)
        at org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor.visitClass(StaticTypeCheckingVisitor.java:436)
        at org.codehaus.groovy.transform.sc.StaticCompilationVisitor.visitClass(StaticCompilationVisitor.java:197)
        at org.codehaus.groovy.transform.sc.StaticCompileTransformation.visit(StaticCompileTransformation.java:68)
        at org.codehaus.groovy.control.customizers.ASTTransformationCustomizer.call(ASTTransformationCustomizer.groovy:298)
        at org.codehaus.groovy.control.CompilationUnit$IPrimaryClassNodeOperation.doPhaseOperation(CompilationUnit.java:925)
        at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:654)
        at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:631)
        at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:607)
        at org.codehaus.groovy.tools.FileSystemCompiler.compile(FileSystemCompiler.java:311)
        at org.codehaus.groovy.tools.FileSystemCompiler.doCompilation(FileSystemCompiler.java:240)
        at org.codehaus.groovy.tools.FileSystemCompiler.commandLineCompile(FileSystemCompiler.java:165)
        at org.codehaus.groovy.tools.FileSystemCompiler.commandLineCompileWithErrorHandling(FileSystemCompiler.java:205)
        at org.codehaus.groovy.tools.FileSystemCompiler.main(FileSystemCompiler.java:189)

Tested against master