// test modification of a substring after an assignment.

var a := "testvalue";
var b := "value2";
var c := "value";

print( "a=" + a );
print( "b=" + b );
print( "c=" + c );

var d := a["val"];

// This is key: this assignment must not modify 'a'.
d := "hello";

print( "a=" + a );
print( "d=" + d );

// Now, this one _should_.
a["val"] := "hello";

print( "a=" + a );
print( "d=" + d );