patch 8.2.1143: Vim9: return type of remove() is any

Problem:    Vim9: return type of remove() is any.
Solution:   Use the member type of the first argument, if known.

src/evalfunc.c

@@ -382,6 +382,17 @@ ret_argv(int argcount, type_T **argtypes UNUSED)
     return &t_any;
 }
 
+    static type_T *
+ret_remove(int argcount UNUSED, type_T **argtypes)
+{
+    if (argtypes[0]->tt_type == VAR_LIST
+	    || argtypes[0]->tt_type == VAR_DICT)
+	return argtypes[0]->tt_member;
+    if (argtypes[0]->tt_type == VAR_BLOB)
+	return &t_number;
+    return &t_any;
+}
+
 static type_T *ret_f_function(int argcount, type_T **argtypes);
 
 /*
@@ -827,7 +838,7 @@ static funcentry_T global_functions[] =
     {"remote_read",	1, 2, FEARG_1,	  ret_string,	f_remote_read},
     {"remote_send",	2, 3, FEARG_1,	  ret_string,	f_remote_send},
     {"remote_startserver", 1, 1, FEARG_1, ret_void,	f_remote_startserver},
-    {"remove",		2, 3, FEARG_1,	  ret_any,	f_remove},
+    {"remove",		2, 3, FEARG_1,	  ret_remove,	f_remove},
     {"rename",		2, 2, FEARG_1,	  ret_number,	f_rename},
     {"repeat",		2, 2, FEARG_1,	  ret_first_arg, f_repeat},
     {"resolve",		1, 1, FEARG_1,	  ret_string,	f_resolve},

src/testdir/test_vim9_func.vim

@@ -927,6 +927,15 @@ def Test_insert_return_type()
   assert_equal(6, res)
 enddef
 
+def Test_remove_return_type()
+  let l = remove(#{one: [1, 2], two: [3, 4]}, 'one')
+  let res = 0
+  for n in l
+    res += n
+  endfor
+  assert_equal(3, res)
+enddef
+
 def Test_filter_return_type()
   let l = filter([1, 2, 3], {-> 1})
   let res = 0

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1143,
 /**/
     1142,
 /**/