Fix KT-10805 for 'when'.

compiler/testData/diagnostics/tests/when/whenWithNothingAndLambdas.kt

@@ -0,0 +1,37 @@
+val <!IMPLICIT_NOTHING_PROPERTY_TYPE!>test1<!> = when {
+    true -> { <!TYPE_MISMATCH!>{ true }<!> }
+    else -> TODO()
+}
+
+val test1a: () -> Boolean = when {
+    true -> { { true } }
+    else -> TODO()
+}
+
+val <!IMPLICIT_NOTHING_PROPERTY_TYPE!>test2<!> = when {
+    true -> { <!TYPE_MISMATCH!>{ true }<!> }
+    else -> when {
+        true -> { <!TYPE_MISMATCH!>{ true }<!> }
+        else -> TODO()
+    }
+}
+
+val test2a: () -> Boolean = when {
+    true -> { { true } }
+    else -> when {
+        true -> { <!TYPE_MISMATCH!>{ true }<!> } // TODO
+        else -> TODO()
+    }
+}
+
+val <!IMPLICIT_NOTHING_PROPERTY_TYPE!>test3<!> = when {
+    true -> { <!TYPE_MISMATCH!>{ true }<!> }
+    true -> { <!TYPE_MISMATCH!>{ true }<!> }
+    else -> TODO()
+}
+
+val test3a: () -> Boolean = when {
+    true -> { { true } }
+    true -> { { true } }
+    else -> TODO()
+}

compiler/testData/diagnostics/tests/when/whenWithNothingAndLambdas.txt

@@ -0,0 +1,8 @@
+package
+
+public val test1: kotlin.Nothing
+public val test1a: () -> kotlin.Boolean
+public val test2: kotlin.Nothing
+public val test2a: () -> kotlin.Boolean
+public val test3: kotlin.Nothing
+public val test3a: () -> kotlin.Boolean