AA: expected type for expression passed to vararg

analysis/analysis-api-fe10/src/org/jetbrains/kotlin/analysis/api/descriptors/components/KtFe10ExpressionTypeProvider.kt

@@ -19,6 +19,7 @@ import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.psiUtil.*
 import org.jetbrains.kotlin.resolve.BindingContext
+import org.jetbrains.kotlin.resolve.calls.components.isVararg
 import org.jetbrains.kotlin.resolve.calls.inference.returnTypeOrNothing
 import org.jetbrains.kotlin.resolve.calls.smartcasts.MultipleSmartCasts
 import org.jetbrains.kotlin.resolve.calls.smartcasts.SingleSmartCast
@@ -210,9 +211,14 @@ class KtFe10ExpressionTypeProvider(
                     if (parameterDescriptor != null) {
                         val kotlinType = when (val originalCallableDescriptor = parameterDescriptor.containingDeclaration) {
                             is SamConstructorDescriptor -> originalCallableDescriptor.returnTypeOrNothing
-                            else -> parameterDescriptor.type
+                            else -> {
+                                if (parameterDescriptor.isVararg)
+                                    parameterDescriptor.varargElementType
+                                else
+                                    parameterDescriptor.type
+                            }
                         }
-                        return kotlinType.toKtType(analysisContext)
+                        return kotlinType?.toKtType(analysisContext)
                     }
                 }
             }

analysis/analysis-api-fe10/tests-gen/org/jetbrains/kotlin/analysis/api/fe10/test/cases/generated/cases/components/expressionTypeProvider/Fe10IdeNormalAnalysisSourceModuleExpectedExpressionTypeTestGenerated.java

@@ -232,6 +232,24 @@ public class Fe10IdeNormalAnalysisSourceModuleExpectedExpressionTypeTestGenerate
         runTest("analysis/analysis-api/testData/components/expressionTypeProvider/expectedExpressionType/samAsReturn.kt");
     }
 
+    @Test
+    @TestMetadata("samReferenceAsArgument.kt")
+    public void testSamReferenceAsArgument() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionTypeProvider/expectedExpressionType/samReferenceAsArgument.kt");
+    }
+
+    @Test
+    @TestMetadata("samReferenceAsVararg.kt")
+    public void testSamReferenceAsVararg() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionTypeProvider/expectedExpressionType/samReferenceAsVararg.kt");
+    }
+
+    @Test
+    @TestMetadata("samReferenceWithTypeCast.kt")
+    public void testSamReferenceWithTypeCast() throws Exception {
+        runTest("analysis/analysis-api/testData/components/expressionTypeProvider/expectedExpressionType/samReferenceWithTypeCast.kt");
+    }
+
     @Test
     @TestMetadata("samWithExplicitTypeFromProperty.kt")
     public void testSamWithExplicitTypeFromProperty() throws Exception {