@testcase PR#75129 NPE on thisJoinPoint mistake

tests/ajcTestsFailing.xml

@@ -152,5 +152,14 @@
           files="Test_AroundVarBug.java,AroundVarBug.java"/>
         <run class="Test_AroundVarBug"/>
     </ajc-test>
+
+    <ajc-test 
+    	dir="bugs" 
+    	pr="75129"
+		title="NPE on thisJoinPoint mistake">
+        <compile files="TjpMistake.java">
+        	<message kind="error" line="22"/>
+        </compile>
+    </ajc-test>
     
 </suite>

tests/bugs/TjpMistake.java

@@ -0,0 +1,29 @@
+/** @testcase PR#75129 NPE on thisJoinPoint mistake */
+public class TjpMistake {
+public static void main(String[] a) {
+   new C().go();
+   new D().go();
+   new E().go();
+}
+}
+interface I { void go();}
+class C {}
+class D { 
+  public void go() { System.out.println("D.go() in " + this); }
+}
+class E extends D { 
+}
+aspect A {
+  declare parents: (C || D) implements I;
+  public void I.go() { System.out.println("I.go() in " + this); }
+  before() : execution(* I.*(..)) { 
+	System.out.println(
+	// mistake caused compiler crash rather than error
+	thisJoinPoint.getSignature.toLongString()  // CE 22
+	// correct
+	//thisJoinPointStaticPart.getSignature().toLongString() 
+	+ " " 
+	+ thisJoinPoint.getSignature().getDeclaringType() 
+	+ " " 
+	+ this); }
+}