From 54bfc77c966767ff6c558c3106d616abd92f54ac Mon Sep 17 00:00:00 2001
From: Semyon Proshev <Semyon.Proshev@jetbrains.com>
Date: Mon, 16 Jul 2018 19:05:24 +0300
Subject: [PATCH] Fix processing empty parameters (EA-124905)

---
 .../com/jetbrains/python/inspections/PyDataclassInspection.kt  | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/python/src/com/jetbrains/python/inspections/PyDataclassInspection.kt b/python/src/com/jetbrains/python/inspections/PyDataclassInspection.kt
index 7815e5de6d0c..11d655a918e7 100644
--- a/python/src/com/jetbrains/python/inspections/PyDataclassInspection.kt
+++ b/python/src/com/jetbrains/python/inspections/PyDataclassInspection.kt
@@ -510,7 +510,8 @@ class PyDataclassInspection : PyInspection() {
                         ProblemHighlightType.LIKE_UNUSED_SYMBOL)
       }
 
-      val parameters = ContainerUtil.subList(postInit.getParameters(myTypeEvalContext), 1)
+      val implicitParameters = postInit.getParameters(myTypeEvalContext)
+      val parameters = if (implicitParameters.isEmpty()) emptyList<PyCallableParameter>() else ContainerUtil.subList(implicitParameters, 1)
       val message = "'$DUNDER_POST_INIT' should take all init-only variables in the same order as they are defined"
 
       if (parameters.size != initVars.size) {