support "show expression type" in variable declaration position

#KT-10095 Fixed

generators/src/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -581,6 +581,10 @@ fun main(args: Array<String>) {
             model("codeInsight/unwrapAndRemove/unwrapLambda", testMethod = "doTestLambdaUnwrapper")
         }
 
+        testClass<AbstractExpressionTypeTest>() {
+            model("codeInsight/expressionType")
+        }
+
         testClass<AbstractBackspaceHandlerTest>() {
             model("editor/backspaceHandler")
         }