Allow dynamic types only in some contexts

compiler/testData/diagnostics/tests/dynamicTypes/assignment.kt

@@ -0,0 +1,11 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+// !CHECK_TYPE
+
+// MODULE[js]: m1
+// FILE: k.kt
+
+fun foo(d: dynamic) {
+    val s: String = d
+    val d1: dynamic = ""
+    val d2: dynamic = null
+}

compiler/testData/diagnostics/tests/dynamicTypes/assignment.txt

@@ -0,0 +1,3 @@
+package
+
+internal fun foo(/*0*/ d: (kotlin.Nothing..kotlin.Any?)): kotlin.Unit

compiler/testData/diagnostics/tests/dynamicTypes/unsupported.kt

@@ -0,0 +1 @@
+val foo: <!UNSUPPORTED!>dynamic<!> = 1

compiler/testData/diagnostics/tests/dynamicTypes/unsupported.txt

@@ -0,0 +1,3 @@
+package
+
+internal val foo: dynamic = 1