Type variables extending other variables should include the separator

asm-util/src/main/java/org/objectweb/asm/util/TraceSignatureVisitor.java

@@ -217,7 +217,8 @@ public final class TraceSignatureVisitor extends SignatureVisitor {
 
   @Override
   public void visitTypeVariable(final String name) {
-    declaration.append(name);
+    declaration.append(separator).append(name);
+    separator = "";
     endType();
   }
 

asm-util/src/test/java/org/objectweb/asm/util/TraceSignatureVisitorTest.java

@@ -73,6 +73,11 @@ public class TraceSignatureVisitorTest {
       "false",
       "<K extends java.lang.Enum<K>, V> extends java.util.AbstractMap<K, V> implements java.io.Serializable, java.lang.Cloneable",
       "<K:Ljava/lang/Enum<TK;>;V:Ljava/lang/Object;>Ljava/util/AbstractMap<TK;TV;>;Ljava/io/Serializable;Ljava/lang/Cloneable;"
+    },
+    {
+      "false",
+      "<T, R extends T>",
+      "<T:Ljava/lang/Object;R:TT;>Ljava/lang/Object;"
     }
   };