patch 8.2.0517: Vim9: cannot separate "func" and "func(): void"

Problem:    Vim9: cannot separate "func" and "func(): void".
Solution:   Use VAR_ANY for "any" and VAR_UNKNOWN for "no type".
diff --git a/src/eval.c b/src/eval.c
index 6d666e6..3b789da 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1272,6 +1272,7 @@
 	switch (tv1->v_type)
 	{
 	    case VAR_UNKNOWN:
+	    case VAR_ANY:
 	    case VAR_VOID:
 	    case VAR_DICT:
 	    case VAR_FUNC:
@@ -2967,6 +2968,7 @@
 		emsg(_("E909: Cannot index a special variable"));
 	    return FAIL;
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	    if (evaluate)
 		return FAIL;
@@ -3073,6 +3075,7 @@
 	switch (rettv->v_type)
 	{
 	    case VAR_UNKNOWN:
+	    case VAR_ANY:
 	    case VAR_VOID:
 	    case VAR_FUNC:
 	    case VAR_PARTIAL:
@@ -3668,7 +3671,7 @@
 }
 
 /*
- * Return the function name of the partial.
+ * Return the function name of partial "pt".
  */
     char_u *
 partial_name(partial_T *pt)
@@ -3856,6 +3859,7 @@
 	    return tv1->vval.v_string == tv2->vval.v_string;
 
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	    break;
     }
@@ -4570,6 +4574,7 @@
 
 	case VAR_NUMBER:
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	    *tofree = NULL;
 	    r = tv_get_string_buf(tv, numbuf);
@@ -5422,6 +5427,7 @@
 #endif
 	    case VAR_NUMBER:
 	    case VAR_FLOAT:
+	    case VAR_ANY:
 	    case VAR_UNKNOWN:
 	    case VAR_VOID:
 	    case VAR_BOOL:
@@ -5486,6 +5492,7 @@
 		varp->vval.v_channel = NULL;
 #endif
 	    case VAR_UNKNOWN:
+	    case VAR_ANY:
 	    case VAR_VOID:
 		break;
 	}
@@ -5565,6 +5572,7 @@
 	    emsg(_("E974: Using a Blob as a Number"));
 	    break;
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	    internal_error_no_abort("tv_get_number(UNKNOWN)");
 	    break;
@@ -5619,6 +5627,7 @@
 	    emsg(_("E975: Using a Blob as a Float"));
 	    break;
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	    internal_error_no_abort("tv_get_float(UNKNOWN)");
 	    break;
@@ -5742,6 +5751,7 @@
 #endif
 	    break;
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	    emsg(_(e_inval_string));
 	    break;
@@ -5891,6 +5901,7 @@
 	    }
 	    break;
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	    internal_error_no_abort("copy_tv(UNKNOWN)");
 	    break;
@@ -5970,6 +5981,7 @@
 		ret = FAIL;
 	    break;
 	case VAR_UNKNOWN:
+	case VAR_ANY:
 	case VAR_VOID:
 	    internal_error_no_abort("item_copy(UNKNOWN)");
 	    ret = FAIL;