Introduce warning about forbidden referencing to underscore named parameter of the catch block in a future release (KT-31567)

compiler/psi/src/org/jetbrains/kotlin/psi/KtParameter.java

@@ -140,6 +140,10 @@ public class KtParameter extends KtNamedDeclarationStub<KotlinParameterStub> imp
         return getParent() instanceof KtForExpression;
     }
 
+    public boolean isCatchParameter() {
+        return getParent().getParent() instanceof KtCatchClause;
+    }
+
     @Nullable
     @Override
     public KtParameterList getValueParameterList() {

compiler/psi/src/org/jetbrains/kotlin/psi/psiUtil/ktPsiUtil.kt

@@ -673,3 +673,6 @@ fun getTrailingCommaByElementsList(elementList: PsiElement?): PsiElement? {
     val lastChild = elementList?.lastChild?.let { if (it !is PsiComment) it else it.getPrevSiblingIgnoringWhitespaceAndComments() }
     return lastChild?.takeIf { it.node.elementType == KtTokens.COMMA }
 }
+
+val KtNameReferenceExpression.isUnderscoreInBackticks
+    get() = getReferencedName() == "`_`"