patch 9.0.2078: several problems with type aliases

Problem:  several problems with type aliases
Solution: Check for more error conditions, add tests,
          fix issues

Check for more error conditions and add additional tests

fixes  #13434
fixes  #13437
fixes  #13438
closes #13441

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 7901f6e..ff54bcb 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -3809,7 +3809,7 @@
 		tv = STACK_TV_VAR(iptr->isn_arg.number);
 		if (STACK_TV_BOT(0)->v_type == VAR_TYPEALIAS)
 		{
-		    semsg(_(e_using_typealias_as_variable),
+		    semsg(_(e_using_typealias_as_value),
 				STACK_TV_BOT(0)->vval.v_typealias->ta_name);
 		    clear_tv(STACK_TV_BOT(0));
 		    goto on_error;