Smart completion when only named argument possible

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/util/callUtil.kt

@@ -34,7 +34,7 @@ import org.jetbrains.kotlin.utils.sure
 // resolved call
 
 public fun <D : CallableDescriptor> ResolvedCall<D>.noErrorsInValueArguments(): Boolean {
-    return getCall().getValueArguments().all { argument -> !getArgumentMapping(argument!!).isError() }
+    return getCall().getValueArguments().all { argument -> argument.getArgumentExpression() != null/* isError() crashes otherwise!*/ && !getArgumentMapping(argument!!).isError() }
 }
 
 public fun <D : CallableDescriptor> ResolvedCall<D>.hasUnmappedArguments(): Boolean {

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionSession.kt

@@ -399,6 +399,11 @@ class SmartCompletionSession(configuration: CompletionSessionConfiguration, para
     private val DESCRIPTOR_KIND_MASK = DescriptorKindFilter.VALUES exclude SamConstructorDescriptorKindExclude
 
     override fun doComplete() {
+        if (NamedParametersCompletion.isOnlyNamedParameterExpected(position)) {
+            NamedParametersCompletion.complete(position, collector, bindingContext)
+            return
+        }
+
         if (expression != null) {
             val mapper = ToFromOriginalFileMapper(parameters.getOriginalFile() as JetFile, position.getContainingFile() as JetFile, parameters.getOffset())
 

idea/idea-completion/testData/smart/AfterEmptyArgument.kt

@@ -0,0 +1,10 @@
+fun foo(param1: String, param2: Int, param3: Char) { }
+
+fun bar(pInt: Int, pString: String) {
+    foo(param2 = , <caret>)
+}
+
+// EXIST: { lookupString: "param1", itemText: "param1 =" }
+// EXIST: { lookupString: "param3", itemText: "param3 =" }
+// ABSENT: param2
+// NUMBER: 2

idea/idea-completion/testData/smart/AfterNamedArgument.kt

@@ -0,0 +1,10 @@
+fun foo(param1: String, param2: Int, param3: Char) { }
+
+fun bar(pInt: Int, pString: String) {
+    foo(param2 = 1, <caret>)
+}
+
+// EXIST: { lookupString: "param1", itemText: "param1 =" }
+// EXIST: { lookupString: "param3", itemText: "param3 =" }
+// ABSENT: param2
+// NUMBER: 2

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmSmartCompletionTestGenerated.java

@@ -31,12 +31,24 @@ import java.util.regex.Pattern;
 @TestDataPath("$PROJECT_ROOT")
 @RunWith(JUnit3RunnerWithInners.class)
 public class JvmSmartCompletionTestGenerated extends AbstractJvmSmartCompletionTest {
+    @TestMetadata("AfterEmptyArgument.kt")
+    public void testAfterEmptyArgument() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/smart/AfterEmptyArgument.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("AfterExclSign.kt")
     public void testAfterExclSign() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/smart/AfterExclSign.kt");
         doTest(fileName);
     }
 
+    @TestMetadata("AfterNamedArgument.kt")
+    public void testAfterNamedArgument() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/smart/AfterNamedArgument.kt");
+        doTest(fileName);
+    }
+
     public void testAllFilesPresentInSmart() throws Exception {
         JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/idea-completion/testData/smart"), Pattern.compile("^(.+)\\.kt$"), true);
     }