diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/FirArgumentsToParametersMapper.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/FirArgumentsToParametersMapper.kt
index 4de2a1285cd..b1dc13ded26 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/FirArgumentsToParametersMapper.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/FirArgumentsToParametersMapper.kt
@@ -262,19 +262,27 @@ private class FirCallArgumentsProcessor(
             return
         }
 
-        if (lastParameter.isVararg) {
-            addDiagnostic(VarargArgumentOutsideParentheses(externalArgument, lastParameter))
-            return
+        if (function.origin != FirDeclarationOrigin.DynamicScope) {
+            if (lastParameter.isVararg) {
+                addDiagnostic(VarargArgumentOutsideParentheses(externalArgument, lastParameter))
+                return
+            }
+
+            val previousOccurrence = result[lastParameter]
+            if (previousOccurrence != null) {
+                addDiagnostic(TooManyArguments(externalArgument, function))
+                return
+            }
+
+            result[lastParameter] = ResolvedCallArgument.SimpleArgument(externalArgument)
+        } else {
+            val existing = result[lastParameter]
+            if (existing == null) {
+                result[lastParameter] = ResolvedCallArgument.SimpleArgument(externalArgument)
+            } else {
+                result[lastParameter] = ResolvedCallArgument.VarargArgument(existing.arguments + externalArgument)
+            }
         }
-
-        val previousOccurrence = result[lastParameter]
-        if (previousOccurrence != null) {
-            addDiagnostic(TooManyArguments(externalArgument, function))
-            return
-        }
-
-
-        result[lastParameter] = ResolvedCallArgument.SimpleArgument(externalArgument)
     }
 
     fun processExcessLambdaArguments(excessLambdaArguments: List<FirExpression>) {
@@ -312,7 +320,7 @@ private class FirCallArgumentsProcessor(
     private fun completeVarargPositionArguments() {
         assert(state == State.VARARG_POSITION) { "Incorrect state: $state" }
         val parameter = parameters[currentPositionedParameterIndex]
-        result.put(parameter, ResolvedCallArgument.VarargArgument(varargArguments!!))
+        result[parameter] = ResolvedCallArgument.VarargArgument(varargArguments!!)
     }
 
     private fun addVarargArgument(argument: FirExpression) {
diff --git a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/conventions.fir.kt b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/conventions.fir.kt
index 9a7527cf1d7..ae2872bfe52 100644
--- a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/conventions.fir.kt
+++ b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/conventions.fir.kt
@@ -31,7 +31,7 @@ fun test(d: dynamic) {
     <!DEBUG_INFO_DYNAMIC!>d()<!>
     <!DEBUG_INFO_DYNAMIC!>d(1)<!>
     <!DEBUG_INFO_DYNAMIC!>d(name = 1)<!>
-    <!DEBUG_INFO_DYNAMIC!>d <!VARARG_OUTSIDE_PARENTHESES!>{}<!><!>
+    <!DEBUG_INFO_DYNAMIC!>d {}<!>
 
     class C {
         val plus: dynamic = null
diff --git a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/dynamicCallsWithLambdas.fir.kt b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/dynamicCallsWithLambdas.fir.kt
index dcf1109eb91..3170ff580ba 100644
--- a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/dynamicCallsWithLambdas.fir.kt
+++ b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/dynamicCallsWithLambdas.fir.kt
@@ -2,19 +2,19 @@
 // !CHECK_TYPE
 
 fun test(d: dynamic) {
-    d.foo <!VARARG_OUTSIDE_PARENTHESES!>{}<!>
+    d.foo {}
 
-    d.foo <!VARARG_OUTSIDE_PARENTHESES!>{ <!UNRESOLVED_REFERENCE!>it<!> }<!>
+    d.foo { <!UNRESOLVED_REFERENCE!>it<!> }
 
-    d.foo <!VARARG_OUTSIDE_PARENTHESES!>{ x -> }<!>
+    d.foo { x -> }
 
-    d.foo <!VARARG_OUTSIDE_PARENTHESES!>{ x: Int -> "" }<!>
+    d.foo { x: Int -> "" }
 
-    d.foo <!VARARG_OUTSIDE_PARENTHESES!>{ x, y -> "" }<!>
+    d.foo { x, y -> "" }
 
-    d.foo <!VARARG_OUTSIDE_PARENTHESES!>{ x: String, y: Int -> "" }<!>
+    d.foo { x: String, y: Int -> "" }
 
-    d.foo <!VARARG_OUTSIDE_PARENTHESES!>{ x, y: Int -> "" }<!>
+    d.foo { x, y: Int -> "" }
 
     d.foo({})
 
diff --git a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/spreadOperator.fir.kt b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/spreadOperator.fir.kt
deleted file mode 100644
index 7e7a1bf2a89..00000000000
--- a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/spreadOperator.fir.kt
+++ /dev/null
@@ -1,22 +0,0 @@
-fun test(d: dynamic) {
-    val a = arrayOf(1, 2, 3)
-
-    d.foo(<!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>d)
-    d.foo(<!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a)
-    d.foo(1, "2", <!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a)
-    d.foo(1, *a) <!VARARG_OUTSIDE_PARENTHESES!>{ }<!>
-    d.foo(*a) <!VARARG_OUTSIDE_PARENTHESES!>{ "" }<!>
-    d.foo(<!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a, <!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a)
-    d.foo(*a, *a) <!VARARG_OUTSIDE_PARENTHESES!>{ "" }<!>
-    d.foo(<!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a, 1, { "" }, <!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a)
-    d.foo(<!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a, 1)
-    d.foo(<!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a, <!SPREAD_OPERATOR_IN_DYNAMIC_CALL!>*<!>a, { "" })
-
-    bar(d)
-    bar(d, d)
-    bar(<!WRONG_OPERATION_WITH_DYNAMIC!>*d<!>)
-    bar(<!WRONG_OPERATION_WITH_DYNAMIC!>*d<!>, <!WRONG_OPERATION_WITH_DYNAMIC!>*d<!>)
-    bar(<!WRONG_OPERATION_WITH_DYNAMIC!>*d<!>, 23, <!WRONG_OPERATION_WITH_DYNAMIC!>*d<!>)
-}
-
-fun bar(vararg x: Int): Unit = TODO("$x")
diff --git a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/spreadOperator.kt b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/spreadOperator.kt
index 2be0f9c449d..a4906ffb962 100644
--- a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/spreadOperator.kt
+++ b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/spreadOperator.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 fun test(d: dynamic) {
     val a = arrayOf(1, 2, 3)