remove new c code

Author: tenderlove

string.c

@@ -2155,86 +2155,6 @@ rb_str_init(rb_execution_context_t *ec, VALUE str, VALUE orig, VALUE no_str, VAL
     return str;
 }
 
-/* :nodoc: */
-VALUE
-rb_str_s_new(int argc, VALUE *argv, VALUE klass)
-{
-    if (klass != rb_cString) {
-        return rb_class_new_instance_pass_kw(argc, argv, klass);
-    }
-
-    static ID keyword_ids[2];
-    VALUE orig, opt, encoding = Qnil, capacity = Qnil;
-    VALUE kwargs[2];
-    rb_encoding *enc = NULL;
-
-    int n = rb_scan_args(argc, argv, "01:", &orig, &opt);
-    if (NIL_P(opt)) {
-        return rb_class_new_instance_pass_kw(argc, argv, klass);
-    }
-
-    keyword_ids[0] = rb_id_encoding();
-    CONST_ID(keyword_ids[1], "capacity");
-    rb_get_kwargs(opt, keyword_ids, 0, 2, kwargs);
-    encoding = kwargs[0];
-    capacity = kwargs[1];
-
-    if (n == 1) {
-        orig = StringValue(orig);
-    }
-    else {
-        orig = Qnil;
-    }
-
-    if (UNDEF_P(encoding)) {
-        if (!NIL_P(orig)) {
-            encoding = rb_obj_encoding(orig);
-        }
-    }
-
-    if (!UNDEF_P(encoding)) {
-        enc = rb_to_encoding(encoding);
-    }
-
-    // If capacity is nil, we're basically just duping `orig`.
-    if (UNDEF_P(capacity)) {
-        if (NIL_P(orig)) {
-            VALUE empty_str = str_new(klass, "", 0);
-            if (enc) {
-                rb_enc_associate(empty_str, enc);
-            }
-            return empty_str;
-        }
-        VALUE copy = str_duplicate(klass, orig);
-        rb_enc_associate(copy, enc);
-        ENC_CODERANGE_CLEAR(copy);
-        return copy;
-    }
-
-    long capa = 0;
-    capa = NUM2LONG(capacity);
-    if (capa < 0) {
-        capa = 0;
-    }
-
-    if (!NIL_P(orig)) {
-        long orig_capa = rb_str_capacity(orig);
-        if (orig_capa > capa) {
-            capa = orig_capa;
-        }
-    }
-
-    VALUE str = str_enc_new(klass, NULL, capa, enc);
-    STR_SET_LEN(str, 0);
-    TERM_FILL(RSTRING_PTR(str), enc ? rb_enc_mbmaxlen(enc) : 1);
-
-    if (!NIL_P(orig)) {
-        rb_str_buf_append(str, orig);
-    }
-
-    return str;
-}
-
 #ifdef NONASCII_MASK
 #define is_utf8_lead_byte(c) (((c)&0xC0) != 0x80)
 

string.rb

@@ -31,6 +31,8 @@ def ascii_only?
   def initialize(orig = (no_str = true; nil),
                 encoding: (no_encoding = true; nil),
                 capacity: (no_capacity = true; nil))
+    return if no_str && no_encoding && no_capacity
+
     Primitive.rb_str_init(orig, no_str, encoding, no_encoding, capacity, no_capacity)
   end
 end