ArrayIndexOutOfBoundsException on finding references

[nya3jp]

Finding references of types occasionally causes ArrayIndexOutOfBoundsException. This is a small repro case:

public class VarTypeReferences {
    private static class Foo {
        public void foo() {}
    }

    public void run() {
        var foo = new Foo();
        foo.foo();
    }
}

Finding references of Foo causes ArrayIndexOutOfBoundsException:

java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 12
        at jdk.compiler/com.sun.tools.javac.util.Position$LineTabMapImpl.getColumnNumber(Position.java:266)
        at jdk.compiler/com.sun.tools.javac.util.Position$LineMapImpl.getColumnNumber(Position.java:236)
        at jdk.compiler/com.sun.tools.javac.util.Position$LineTabMapImpl.getColumnNumber(Position.java:253)
        at org.javacs.FindHelper.location(FindHelper.java:146)
        at org.javacs.FindHelper.location(FindHelper.java:133)
        at org.javacs.navigation.ReferenceProvider.findReferences(ReferenceProvider.java:78)
        at org.javacs.navigation.ReferenceProvider.find(ReferenceProvider.java:32)
        at org.javacs.JavaLanguageServer.findReferences(JavaLanguageServer.java:320)
        at org.javacs.FindReferencesTest.items(FindReferencesTest.java:21)
        at org.javacs.FindReferencesTest.varTypeReferences(FindReferencesTest.java:62)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
        at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
        at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
        at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
        at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
        at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:377)
        at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:284)
        at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:248)
        at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:167)
        at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:456)
        at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:169)
        at org.apache.maven.surefire.booter.ForkedBooter.run(ForkedBooter.java:595)
        at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:581)