Add corrupted signature test

Author: sschr15

test/org/jetbrains/java/decompiler/SingleClassesTest.java

@@ -731,6 +731,7 @@ private void registerDefault() {
     register(JAVA_16, "TestSwitchExpressionReturnType");
     register(JAVA_8, "TestGenericMapping");
 
+    registerRaw(CUSTOM, "TestCorruptedSignatures").setExpectedFileName("Signatures.java");
   }
 
   private void registerEntireClassPath() {

testData/classes/custom/TestCorruptedSignatures.class

@@ -0,0 +1,19 @@
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+abstract class Signatures implements Map<String, String> {
+   Map<String, String> field = new ArrayList();
+
+   void method(Map<String, String> o) {
+   }// 9
+}
+
+class 'Signatures' {
+   method 'method (Ljava/util/List;)V' {
+      0      8
+   }
+}
+
+Lines mapping:
+9 <-> 9