K1 opt-in: fix message/behavior for future error with WasExperimental

compiler/testData/diagnostics/testsWithStdLib/experimental/duration.fir.kt

@@ -0,0 +1,14 @@
+// !API_VERSION: 1.5
+
+import kotlin.time.Duration
+
+@OptIn(kotlin.time.ExperimentalTime::class)
+data class Some(val duration: Duration = Duration.INFINITE)
+
+@OptIn(kotlin.time.ExperimentalTime::class)
+fun foo(duration: Duration = Duration.INFINITE) {}
+
+fun test() {
+    Some()
+    foo()
+}

compiler/testData/diagnostics/testsWithStdLib/experimental/duration.kt

@@ -0,0 +1,14 @@
+// !API_VERSION: 1.5
+
+import kotlin.time.Duration
+
+@OptIn(kotlin.time.ExperimentalTime::class)
+data class Some(val duration: Duration = Duration.INFINITE)
+
+@OptIn(kotlin.time.ExperimentalTime::class)
+fun foo(duration: Duration = Duration.INFINITE) {}
+
+fun test() {
+    <!OPT_IN_USAGE_FUTURE_ERROR!>Some<!>()
+    <!OPT_IN_USAGE_ERROR!>foo<!>()
+}

compiler/testData/diagnostics/testsWithStdLib/experimental/duration.txt

@@ -0,0 +1,14 @@
+package
+
+@kotlin.OptIn(markerClass = {kotlin.time.ExperimentalTime::class}) public fun foo(/*0*/ duration: kotlin.time.Duration = ...): kotlin.Unit
+public fun test(): kotlin.Unit
+
+@kotlin.OptIn(markerClass = {kotlin.time.ExperimentalTime::class}) public final data class Some {
+    public constructor Some(/*0*/ duration: kotlin.time.Duration = ...)
+    public final val duration: kotlin.time.Duration
+    public final operator /*synthesized*/ fun component1(): kotlin.time.Duration
+    public final /*synthesized*/ fun copy(/*0*/ duration: kotlin.time.Duration = ...): Some
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}