'val' in 'when': IEEE754 equality

compiler/testData/codegen/box/when/whenSubjectVariable/ieee754Equality.kt

@@ -0,0 +1,13 @@
+// !LANGUAGE: +VariableDeclarationInWhenSubject
+// IGNORE_BACKEND: JS
+
+val dz = -0.0
+
+fun box(): String {
+    when (val y = dz) {
+        0.0 -> {}
+        else -> throw AssertionError()
+    }
+
+    return "OK"
+}

compiler/testData/codegen/box/when/whenSubjectVariable/ieee754EqualityWithSmartCast.kt

@@ -0,0 +1,14 @@
+// !LANGUAGE: +VariableDeclarationInWhenSubject +ProperIeee754Comparisons
+// IGNORE_BACKEND: JS
+
+val az: Any = -0.0
+
+fun box(): String {
+    when (val y = az) {
+        !is Double -> throw AssertionError()
+        0.0 -> {}
+        else -> throw AssertionError()
+    }
+
+    return "OK"
+}