SSR: avoid IOE (EA-139295)

java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/JavaMatchingVisitor.java

@@ -656,7 +656,7 @@ public class JavaMatchingVisitor extends JavaElementVisitor {
     if (typeElement.isInferredType()) {
       // replace inferred type with explicit type if possible
       final PsiType type = typeElement.getType();
-      if (type == PsiType.NULL) {
+      if (type == PsiType.NULL || type instanceof PsiLambdaParameterType) {
         return typeElement;
       }
       final String canonicalText = type.getCanonicalText();

platform/structuralsearch/testSource/com/intellij/structuralsearch/StructuralSearchTest.java

@@ -2356,6 +2356,15 @@ public class StructuralSearchTest extends StructuralSearchTestCase {
                       "   };\n" +
                       "}";
     assertEquals("match statement body correctly", 1, findMatchesCount(source2, pattern7));
+
+    String source3 = "class LambdaParameter {\n" +
+                     "\n" +
+                     "    void x() {\n" +
+                     "        Runnable r = (var a) -> a = \"\";\n" +
+                     "    }\n" +
+                     "}";
+    String pattern8 = "String '_x;";
+    assertEquals("avoid IncorrectOperationException", 0, findMatchesCount(source3, pattern8));
   }
 
   public void testFindDefaultMethods() {