# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1644347703 -3600
# Node ID db1831f585a46cc93f39045e29a835667a695241
# Parent  a03441c13f68e86f29c666835cbdf54333ce32d9
patch 8.2.4330: Vim9: no error if script imports itself

Commit: https://github.com/vim/vim/commit/779aeff5c32c26161f42cdccbaa2376e78ee77d6
Author: Bram Moolenaar <Bram@vim.org>
Date:   Tue Feb 8 19:12:19 2022 +0000

    patch 8.2.4330: Vim9: no error if script imports itself

    Problem:    Vim9: no error if script imports itself.
    Solution:   Give an error when a script imports itself.

diff --git a/src/errors.h b/src/errors.h
--- a/src/errors.h
+++ b/src/errors.h
@@ -2802,7 +2802,8 @@ EXTERN char e_function_reference_invalid
 	INIT(= N_("E1086: Function reference invalid"));
 EXTERN char e_cannot_use_index_when_declaring_variable[]
 	INIT(= N_("E1087: Cannot use an index when declaring a variable"));
-// E1088 unused
+EXTERN char e_script_cannot_import_itself[]
+	INIT(= N_("E1088: Script cannot import itself"));
 EXTERN char e_unknown_variable_str[]
 	INIT(= N_("E1089: Unknown variable: %s"));
 EXTERN char e_cannot_assign_to_argument[]
diff --git a/src/testdir/test_vim9_import.vim b/src/testdir/test_vim9_import.vim
--- a/src/testdir/test_vim9_import.vim
+++ b/src/testdir/test_vim9_import.vim
@@ -500,7 +500,16 @@ def Test_import_fails()
   v9.CheckScriptFailure(lines, 'E1262:')
 
   delete('Xthat.vim')
- 
+
+  lines =<< trim END
+      vim9script
+      export var item = 'hello'
+      import './Xyourself.vim'
+  END
+  writefile(lines, 'Xyourself.vim')
+  assert_fails('source Xyourself.vim', 'E1088:')
+  delete('Xyourself.vim')
+
   mkdir('Ximport')
 
   writefile(['vim9script'], 'Ximport/.vim')
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4330,
+/**/
     4329,
 /**/
     4328,
diff --git a/src/vim9script.c b/src/vim9script.c
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -516,6 +516,12 @@ handle_import(
 	goto erret;
     }
 
+    if (sid == current_sctx.sc_sid)
+    {
+	emsg(_(e_script_cannot_import_itself));
+	goto erret;
+    }
+
     import_gap = gap != NULL ? gap : &SCRIPT_ITEM(import_sid)->sn_imports;
     for (i = 0; i < import_gap->ga_len; ++i)
     {