JVM_IR KT-44483 argument adaptation is already done in PSI2IR

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java

@@ -2440,6 +2440,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/callableReference/kt37604.kt");
         }
 
+        @Test
+        @TestMetadata("kt44483.kt")
+        public void testKt44483() throws Exception {
+            runTest("compiler/testData/codegen/box/callableReference/kt44483.kt");
+        }
+
         @Test
         @TestMetadata("nested.kt")
         public void testNested() throws Exception {

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/FunctionReferenceLowering.kt

@@ -574,25 +574,6 @@ internal class FunctionReferenceLowering(private val context: JvmBackendContext)
                                 else
                                     irGet(receiver!!)
 
-                            // If a vararg parameter corresponds to exactly one KFunction argument, which is an array, that array
-                            // is forwarded as is.
-                            //
-                            //     fun f(x: (Int, Array<String>) -> String) = x(0, arrayOf("OK", "FAIL"))
-                            //     fun h(i: Int, vararg xs: String) = xs[i]
-                            //     f(::h)
-                            //
-                            parameter.isVararg && unboundIndex < argumentTypes.size && parameter.type == valueParameters[unboundIndex].type ->
-                                irGet(valueParameters[unboundIndex++])
-                            // In all other cases, excess arguments are packed into a new array.
-                            //
-                            //     fun g(x: (Int, String, String) -> String) = x(0, "OK", "FAIL")
-                            //     f(::h) == g(::h)
-                            //
-                            parameter.isVararg && (unboundIndex < argumentTypes.size || !parameter.hasDefaultValue()) ->
-                                irArray(parameter.type) {
-                                    (unboundIndex until argumentTypes.size).forEach { +irGet(valueParameters[unboundIndex++]) }
-                                }
-
                             unboundIndex >= argumentTypes.size ->
                                 // Default value argument (this pass doesn't handle suspend functions, otherwise
                                 // it could also be the continuation argument)

compiler/testData/codegen/box/callableReference/kt37604.kt

@@ -1,4 +1,3 @@
-
 fun useUnit(fn: () -> Unit) {
     fn.invoke()
 }

compiler/testData/codegen/box/callableReference/kt44483.kt

@@ -0,0 +1,10 @@
+// DONT_TARGET_EXACT_BACKEND: WASM
+// WITH_RUNTIME
+
+fun <K, V> f(vararg p: Pair<K, V>): K = p[0].first
+
+fun box(): String {
+    // NB this is not an adapted function reference
+    val f: (Array<out Pair<String, Int>>) -> String = ::f
+    return f(arrayOf("OK" to 0))
+}

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java

@@ -2440,6 +2440,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/callableReference/kt37604.kt");
         }
 
+        @Test
+        @TestMetadata("kt44483.kt")
+        public void testKt44483() throws Exception {
+            runTest("compiler/testData/codegen/box/callableReference/kt44483.kt");
+        }
+
         @Test
         @TestMetadata("nested.kt")
         public void testNested() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -2440,6 +2440,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/callableReference/kt37604.kt");
         }
 
+        @Test
+        @TestMetadata("kt44483.kt")
+        public void testKt44483() throws Exception {
+            runTest("compiler/testData/codegen/box/callableReference/kt44483.kt");
+        }
+
         @Test
         @TestMetadata("nested.kt")
         public void testNested() throws Exception {

compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -2145,6 +2145,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/callableReference/kt37604.kt");
         }
 
+        @TestMetadata("kt44483.kt")
+        public void testKt44483() throws Exception {
+            runTest("compiler/testData/codegen/box/callableReference/kt44483.kt");
+        }
+
         @TestMetadata("nested.kt")
         public void testNested() throws Exception {
             runTest("compiler/testData/codegen/box/callableReference/nested.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java

@@ -1460,6 +1460,11 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/callableReference/kt37604.kt");
         }
 
+        @TestMetadata("kt44483.kt")
+        public void testKt44483() throws Exception {
+            runTest("compiler/testData/codegen/box/callableReference/kt44483.kt");
+        }
+
         @TestMetadata("nested.kt")
         public void testNested() throws Exception {
             runTest("compiler/testData/codegen/box/callableReference/nested.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java

@@ -1460,6 +1460,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/callableReference/kt37604.kt");
         }
 
+        @TestMetadata("kt44483.kt")
+        public void testKt44483() throws Exception {
+            runTest("compiler/testData/codegen/box/callableReference/kt44483.kt");
+        }
+
         @TestMetadata("nested.kt")
         public void testNested() throws Exception {
             runTest("compiler/testData/codegen/box/callableReference/nested.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -1460,6 +1460,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/callableReference/kt37604.kt");
         }
 
+        @TestMetadata("kt44483.kt")
+        public void testKt44483() throws Exception {
+            runTest("compiler/testData/codegen/box/callableReference/kt44483.kt");
+        }
+
         @TestMetadata("nested.kt")
         public void testNested() throws Exception {
             runTest("compiler/testData/codegen/box/callableReference/nested.kt");