Modifying frozen object should throw TypeError

[GoogleCodeExporter]

What steps will reproduce the problem?
a = 'x'
a.freeze  
a << 'x'

What is the expected output? What do you see instead?

can't modify frozen string (TypeError)

Right now this flag was not honored by most set methods

Original issue reported on code.google.com by [email protected] on 27 Mar 2007 at 1:35

[GoogleCodeExporter]

Ruby Hacking Guide's implementation:

/* write val in the id instance of obj */
 984  VALUE
 985  rb_ivar_set(obj, id, val)
 986      VALUE obj;
 987      ID id;
 988      VALUE val;
 989  {
 990      if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4)
 991          rb_raise(rb_eSecurityError,
                       "Insecure: can't modify instance variable");
 992      if (OBJ_FROZEN(obj)) rb_error_frozen("object");
 993      switch (TYPE(obj)) {
 994        case T_OBJECT:
 995        case T_CLASS:
 996        case T_MODULE:
 997          if (!ROBJECT(obj)->iv_tbl)
                  ROBJECT(obj)->iv_tbl = st_init_numtable();
 998          st_insert(ROBJECT(obj)->iv_tbl, id, val);
 999          break;
1000        default:
1001          generic_ivar_set(obj, id, val);
1002          break;
1003      }
1004      return val;
1005  }

(variable.c)

Original comment by [email protected] on 28 Mar 2007 at 6:33