# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1659806103 -7200
# Node ID 9d54c8e6c682eee956ac033660d0be1023886c26
# Parent  2f9626fcda231d2c06281bca254db9c9a7250f30
patch 9.0.0156: giving E1170 only in an expression is confusing

Commit: https://github.com/vim/vim/commit/3f74c0ab32de7ed17dd16d9b06f5455a0bb1c297
Author: Bram Moolenaar <Bram@vim.org>
Date:   Sat Aug 6 18:12:06 2022 +0100

    patch 9.0.0156: giving E1170 only in an expression is confusing

    Problem:    Giving E1170 only in an expression is confusing.
    Solution:   Give E1170 for any "#{ comment". (closes https://github.com/vim/vim/issues/10855)

diff --git a/src/errors.h b/src/errors.h
--- a/src/errors.h
+++ b/src/errors.h
@@ -2984,8 +2984,8 @@ EXTERN char e_argument_already_declared_
 	INIT(= N_("E1168: Argument already declared in the script: %s"));
 EXTERN char e_expression_too_recursive_str[]
 	INIT(= N_("E1169: Expression too recursive: %s"));
-EXTERN char e_cannot_use_hash_curly_to_start_comment_in_an_expression[]
-	INIT(= N_("E1170: Cannot use #{ to start a comment in an expression"));
+EXTERN char e_cannot_use_hash_curly_to_start_comment[]
+	INIT(= N_("E1170: Cannot use #{ to start a comment"));
 EXTERN char e_missing_end_block[]
 	INIT(= N_("E1171: Missing } after inline function"));
 EXTERN char e_cannot_use_default_values_in_lambda[]
diff --git a/src/eval.c b/src/eval.c
--- a/src/eval.c
+++ b/src/eval.c
@@ -2157,8 +2157,6 @@ newline_skip_comments(char_u *arg)
 		    break;
 	    p = nl;
 	}
-	else if (vim9_bad_comment(p))
-	    break;
 	if (*p != NL)
 	    break;
 	++p;  // skip another NL
@@ -2184,10 +2182,7 @@ getline_peek_skip_comments(evalarg_T *ev
 	    break;
 	p = skipwhite(next);
 	if (*p != NUL && !vim9_comment_start(p))
-	{
-	    (void)vim9_bad_comment(p);
 	    return next;
-	}
 	if (eval_next_line(NULL, evalarg) == NULL)
 	    break;
     }
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2842,8 +2842,14 @@ parse_command_modifiers(
 		if (eap->nextcmd != NULL)
 		    ++eap->nextcmd;
 	    }
-	    if (vim9script && has_cmdmod(cmod, FALSE))
-		*errormsg = _(e_command_modifier_without_command);
+	    if (vim9script)
+	    {
+		if (has_cmdmod(cmod, FALSE))
+		    *errormsg = _(e_command_modifier_without_command);
+		if (eap->cmd[0] == '#' && eap->cmd[1] == '{'
+							 && eap->cmd[2] != '{')
+		    *errormsg = _(e_cannot_use_hash_curly_to_start_comment);
+	    }
 	    return FAIL;
 	}
 	if (*eap->cmd == NUL)
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -2668,8 +2668,12 @@ def Test_vim9_comment()
       'vim9script',
       '# something',
       '#something',
+      '#{{something',
+      ])
+  v9.CheckScriptFailure([
+      'vim9script',
       '#{something',
-      ])
+      ], 'E1170:')
 
   split Xfile
   v9.CheckScriptSuccess([
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    156,
+/**/
     155,
 /**/
     154,
diff --git a/src/vim9script.c b/src/vim9script.c
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -176,16 +176,18 @@ not_in_vim9(exarg_T *eap)
 }
 
 /*
- * Give an error message if "p" points at "#{" and return TRUE.
+ * Return TRUE if "p" points at "#{", not "#{{".
+ * Give an error message if not done already.
  * This avoids that using a legacy style #{} dictionary leads to difficult to
  * understand errors.
  */
     int
 vim9_bad_comment(char_u *p)
 {
-    if (!did_emsg && p[0] == '#' && p[1] == '{' && p[2] != '{')
+    if (p[0] == '#' && p[1] == '{' && p[2] != '{')
     {
-	emsg(_(e_cannot_use_hash_curly_to_start_comment_in_an_expression));
+	if (!did_emsg)
+	    emsg(_(e_cannot_use_hash_curly_to_start_comment));
 	return TRUE;
     }
     return FALSE;
@@ -194,12 +196,13 @@ vim9_bad_comment(char_u *p)
 
 /*
  * Return TRUE if "p" points at a "#" not followed by one '{'.
+ * Gives an error for using "#{", not for "#{{".
  * Does not check for white space.
  */
     int
 vim9_comment_start(char_u *p)
 {
-    return p[0] == '#' && (p[1] != '{' || p[2] == '{');
+    return p[0] == '#' && !vim9_bad_comment(p);
 }
 
 #if defined(FEAT_EVAL) || defined(PROTO)