errortests/operators.asy: 4.3: multiple operator[] definitions in one struct
errortests/operators.asy: 11.3: operator[=] defined without operator[]
errortests/operators.asy: 17.3: operator[=] must return void
errortests/operators.asy: 28.3: no matching variable '<exp>.valid'
errortests/operators.asy: 28.3: no matching variable '<exp>.get'
errortests/operators.asy: 28.3: no matching variable '<exp>.advance'
errortests/operators.asy: 38.16: cannot iterate over expression of type 'int(int i)'
errortests/operators.asy: 45.17: cannot call 'int f(int i)' with parameter 'string'
errortests/operators.asy: 48.17: cannot call 'int f(int i)' with parameter 'string'
