A major Alice bug

(Display Listing 4.)

Alice has a bug that limits the usefulness of arrays.

The code in Listing 4 runs okay until the last statement is encountered.

The last statement causes a runtime error.

This makes it impossible to populate an array element using the contents of a variable.

Listing 4. Source code for the program named ArrayErr01.

public void main ( ) {     Number[] anArray = ; Number data = 0 ; Number moreData = 10 ;        // Store literal value in anArray[0]   anArray [ 0 ] = 2 ;   data .set( value , ( anArray [ 0 ] ) );   print( ( data .toString() ) );   // Store variable's value in anArray[1]   // The following statement causes a runtime error.   anArray [ 1 ] = moreData ;   }