Fix ISE in KotlinPairMatcher.getCodeConstructStart()

idea/src/org/jetbrains/kotlin/idea/KotlinPairMatcher.kt

@@ -44,7 +44,9 @@ class KotlinPairMatcher : PairedBraceMatcher {
         if (element == null || element is PsiFile) return openingBraceOffset
         val parent = element.parent
         return when (parent) {
-            is KtClassBody, is KtBlockExpression -> DeclarationRangeUtil.getDeclarationRange(parent.parent).startOffset
+            is KtClassBody, is KtBlockExpression ->
+                DeclarationRangeUtil.getPossibleDeclarationAtRange(parent.parent)?.startOffset ?: openingBraceOffset
+
             else -> openingBraceOffset
         }
     }

idea/tests/org/jetbrains/kotlin/idea/codeInsight/KotlinPairMatcherTest.kt

@@ -38,4 +38,8 @@ class KotlinPairMatcherTest : KotlinLightCodeInsightFixtureTestCase() {
     fun testFun() {
         doTest("/* Doc comment */ <start>fun xyzzy(x: Int, y: String): Any <brace>{ }")
     }
+
+    fun testFor() {
+        doTest("fun xyzzy() { for (x in 0..1)<start><brace>{ } }")
+    }
 }