openide/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/other/afterTwoDimArray.java

// "Collapse loop with stream 'sum()'" "true-preview"

import java.util.stream.IntStream;

public class Matrix {

  public double trace(final double[][] a) {
    double sum = IntStream.range(0, a.length).mapToDouble(i -> a[i][i]).sum();

      return sum;
  }
}