String.c の str_new4 の assert に引っかかってしまいます

Ruby Development
1

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ruby: string.c:663: str_new4: Assertion `(!!((!(((VALUE)((shared)) &
RUBY_IMMEDIATE_MASK) || !(((VALUE)((shared)) & ~((VALUE)RUBY_Qnil)) !=
0)) && (int)(((struct RBasic*)((shared)))->flags & RUBY_T_MASK) !=
RUBY_T_NODE)?(((struct
RBasic*)((shared)))->flags&((((VALUE)1)<<11))):0))’ failed.

string.c $B$NEv3:2U=j$r8+$F$_$k$H!"(Bstr_new4 $B$NCf$N(B assert $B$K(B
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static VALUE
str_new4(VALUE klass, VALUE str)
{
VALUE str2;

str2 = str_alloc(klass);
STR_SET_NOEMBED(str2);
RSTRING(str2)->as.heap.len = RSTRING_LEN(str);
RSTRING(str2)->as.heap.ptr = RSTRING_PTR(str);
if (STR_SHARED_P(str)) {
    VALUE shared = RSTRING(str)->as.heap.aux.shared;
    assert(OBJ_FROZEN(shared));                            <===

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FL_SET(str2, ELTS_SHARED);
RSTRING(str2)->as.heap.aux.shared = shared;
}
else {
FL_SET(str, ELTS_SHARED);
RSTRING(str)->as.heap.aux.shared = str2;
}
rb_enc_cr_str_exact_copy(str2, str);
OBJ_INFECT(str2, str);
return str2;
}

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commit 7915aed8752566f355ab4b19216da96836fd9589
Author: nobu nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Date: Thu Jun 11 17:41:27 2009 +0000

* string.c (str_replace_shared): shared target must be frozen.
  [ruby-core:23727]
2

(2012/09/19 17:20), Sasaki Shingo wrote:

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