Raise when loading unprovided builtin function [Bug #17192]

compile.c

@@ -10296,14 +10296,13 @@ ibf_load_builtin(const struct ibf_load *load, ibf_offset_t *offset)
     const char *name = (char *)ibf_load_ptr(load, offset, len);
 
     if (0) {
-        for (int i=0; i<len; i++) fprintf(stderr, "%c", name[i]);
-        fprintf(stderr, "!!\n");
+        fprintf(stderr, "%.*s!!\n", len, name);
     }
 
     const struct rb_builtin_function *table = GET_VM()->builtin_function_table;
-    if (table == NULL) rb_bug("%s: table is not provided.", RUBY_FUNCTION_NAME_STRING);
+    if (table == NULL) rb_raise(rb_eArgError, "builtin function table is not provided");
     if (strncmp(table[i].name, name, len) != 0) {
-        rb_bug("%s: index (%d) mismatch (expect %s but %s).", RUBY_FUNCTION_NAME_STRING, i, name, table[i].name);
+        rb_raise(rb_eArgError, "builtin function index (%d) mismatch (expect %s but %s)", i, name, table[i].name);
     }
     // fprintf(stderr, "load-builtin: name:%s(%d)\n", table[i].name, table[i].argc);
 

test/ruby/test_iseq.rb

@@ -590,6 +590,21 @@ def test_iseq_builtin_to_a
     assert_equal([:func_ptr, :argc, :index, :name], invokebuiltin[1].keys)
   end
 
+  def test_iseq_builtin_load
+    Tempfile.create(["builtin", ".iseq"]) do |f|
+      f.binmode
+      f.write(RubyVM::InstructionSequence.of(1.method(:abs)).to_binary)
+      f.close
+      assert_separately(["-", f.path], "#{<<~"begin;"}\n#{<<~'end;'}")
+      begin;
+        bin = File.binread(ARGV[0])
+        assert_raise(ArgumentError) do
+          RubyVM::InstructionSequence.load_from_binary(bin)
+        end
+      end;
+    end
+  end
+
   def test_iseq_option_debug_level
     assert_raise(TypeError) {ISeq.compile("", debug_level: "")}
     assert_ruby_status([], "#{<<~"begin;"}\n#{<<~'end;'}")