Make new appendStringUnsafe to see how latest change to appendString plays out

Author: enebo

core/src/main/java/org/jruby/RubyProc.java

@@ -239,17 +239,17 @@ public IRubyObject to_s() {
         string.setEncoding(RubyString.ASCII);
 
         string.append(types(runtime, type()));
-        string.catString(":0x" + Integer.toString(System.identityHashCode(block), 16));
+        string.catStringUnsafe(":0x" + Integer.toString(System.identityHashCode(block), 16));
 
         boolean isSymbolProc = block.getBody() instanceof RubySymbol.SymbolProcBody;
         if (isSymbolProc) {
-            string.catString("(&:" + ((RubySymbol.SymbolProcBody) block.getBody()).getId() + ")");
+            string.catStringUnsafe("(&:" + ((RubySymbol.SymbolProcBody) block.getBody()).getId() + ")");
         } else if ((file = block.getBody().getFile()) != null) {
-            string.catString(" " + file + ":" + (block.getBody().getLine() + 1));
+            string.catStringUnsafe(" " + file + ":" + (block.getBody().getLine() + 1));
         }
 
-        if (isLambda()) string.catString(" (lambda)");
-        string.catString(">");
+        if (isLambda()) string.catStringUnsafe(" (lambda)");
+        string.catStringUnsafe(">");
 
         return string;
     }

core/src/main/java/org/jruby/RubyString.java

@@ -1524,6 +1524,20 @@ public final int catWithCodeRange(ByteList other, int codeRange) {
         return EncodingUtils.encCrStrBufCat(metaClass.runtime, this, other, other.getEncoding(), codeRange);
     }
 
+    /**
+     * Append a Java String to this RubyString assuming it will be the encoding of the RubyString.  If it is
+     * not then then it will end up as an invalid string.  Some methods assume an encoding of BINARY so that
+     * broken bytes are possible/expected (e.g. an error message with two names which are not compatible to be
+     * combined into a single Ruby String).  Proc#to_s is an example of this.
+     * @param str to be appended
+     * @return this string after it has appended str
+     */
+    public final RubyString catStringUnsafe(String str) {
+        ByteList other = encodeBytelist(str, getEncoding());
+        catWithCodeRange(other, CR_UNKNOWN);
+        return this;
+    }
+
     public final RubyString catString(String str) {
         ByteList other = encodeBytelist(str, UTF8);
         catWithCodeRange(other, CR_VALID);