// Subtracting a string removes its first occurrence.
var s := "hello world";
print( s - "l" );
print( s - "o w" );
print( s - "not there" );
print( s - "" );

// Subtracting anything else hands back the string unchanged.
print( s - 1 );
print( s - 1.5 );
print( s - { 1, 2 } );

// A method the compiler does not know is looked up by name at runtime, and a string has
// no such method to offer.
var unknown := s.no_such_method();
print( unknown );