Add `CheckObjectCoercible` for the `String.prototype` HTML methods

src/string.js

Index: src/string.js
diff --git a/src/string.js b/src/string.js
index 0d5ed0fc4297c49b0f79917de5a9e6b6a2758c4d..09564d00593ba41f53c782071edd0c9c1c304e4b 100644
--- a/src/string.js
+++ b/src/string.js
@@ -839,66 +839,79 @@ function HtmlEscape(str) {
 // Compatibility support for KJS.
 // Tested by mozilla/js/tests/js1_5/Regress/regress-276103.js.
 function StringLink(s) {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.link");

[Yang, 2014/08/05 10:34:19]

Now that all of this is specified in ES6, do you mind adding the references to
the sections in the ES6 draft (including draft date)?

   return "<a href=\"" + HtmlEscape(s) + "\">" + this + "</a>";
 }
 
 
 function StringAnchor(name) {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.anchor");
   return "<a name=\"" + HtmlEscape(name) + "\">" + this + "</a>";
 }
 
 
 function StringFontcolor(color) {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.fontcolor");
   return "<font color=\"" + HtmlEscape(color) + "\">" + this + "</font>";
 }
 
 
 function StringFontsize(size) {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.fontsize");
   return "<font size=\"" + HtmlEscape(size) + "\">" + this + "</font>";
 }
 
 
 function StringBig() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.big");
   return "<big>" + this + "</big>";
 }
 
 
 function StringBlink() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.blink");
   return "<blink>" + this + "</blink>";
 }
 
 
 function StringBold() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.bold");
   return "<b>" + this + "</b>";
 }
 
 
 function StringFixed() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.fixed");
   return "<tt>" + this + "</tt>";
 }
 
 
 function StringItalics() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.italics");
   return "<i>" + this + "</i>";
 }
 
 
 function StringSmall() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.small");
   return "<small>" + this + "</small>";
 }
 
 
 function StringStrike() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.strike");
   return "<strike>" + this + "</strike>";
 }
 
 
 function StringSub() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.sub");
   return "<sub>" + this + "</sub>";
 }
 
 
 function StringSup() {
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.sup");
   return "<sup>" + this + "</sup>";
 }