[Bug #20280] Check by `rb_parser_enc_str_coderange`

Co-authored-by: Yuichiro Kaneko <spiketeika@gmail.com>

internal/string.h

@@ -46,7 +46,6 @@ int rb_enc_str_coderange_scan(VALUE str, rb_encoding *enc);
 int rb_ascii8bit_appendable_encoding_index(rb_encoding *enc, unsigned int code);
 VALUE rb_str_include(VALUE str, VALUE arg);
 VALUE rb_str_byte_substr(VALUE str, VALUE beg, VALUE len);
-VALUE rb_str_valid_encoding_p(VALUE str);
 
 static inline bool STR_EMBED_P(VALUE str);
 static inline bool STR_SHARED_P(VALUE str);

parse.y

@@ -13730,11 +13730,15 @@ new_defined(struct parser_params *p, NODE *expr, const YYLTYPE *loc)
 static NODE*
 str_to_sym_node(struct parser_params *p, NODE *node, const YYLTYPE *loc)
 {
-    VALUE lit = rb_node_str_string_val(node);
-    if (!rb_str_valid_encoding_p(lit)) {
+    VALUE lit;
+    rb_parser_string_t *str = RNODE_STR(node)->string;
+    if (rb_parser_enc_str_coderange(p, str) == RB_PARSER_ENC_CODERANGE_BROKEN) {
         yyerror1(loc, "invalid symbol");
         lit = STR_NEW0();
     }
+    else {
+        lit = rb_str_new_parser_string(str);
+    }
     return NEW_SYM(lit, loc);
 }
 

ruby_parser.c

@@ -551,7 +551,6 @@ static const rb_parser_config_t rb_global_parser_config = {
     .id2str = rb_id2str,
     .id2sym = rb_id2sym,
     .sym2id = rb_sym2id,
-    .str_valid_encoding_p = rb_str_valid_encoding_p,
 
     .str_catf = rb_str_catf,
     .str_cat_cstr = rb_str_cat_cstr,

rubyparser.h

@@ -1277,7 +1277,6 @@ typedef struct rb_parser_config_struct {
     VALUE (*id2str)(ID id);
     VALUE (*id2sym)(ID x);
     ID (*sym2id)(VALUE sym);
-    VALUE (*str_valid_encoding_p)(VALUE str);
 
     /* String */
     RBIMPL_ATTR_FORMAT(RBIMPL_PRINTF_FORMAT, 2, 3)

string.c

@@ -11030,7 +11030,7 @@ rb_str_b(VALUE str)
  *    "\x80".force_encoding("UTF-8").valid_encoding?     # => false
  */
 
-VALUE
+static VALUE
 rb_str_valid_encoding_p(VALUE str)
 {
     int cr = rb_enc_str_coderange(str);

universal_parser.c

@@ -173,7 +173,6 @@ struct rb_imemo_tmpbuf_struct {
 #define ID2SYM                   p->config->id2sym
 #undef SYM2ID
 #define SYM2ID                   p->config->sym2id
-#define rb_str_valid_encoding_p  p->config->str_valid_encoding_p
 
 #define rb_str_catf                       p->config->str_catf
 #undef rb_str_cat_cstr