Commit: patch 9.1.2096: Vim9: truthiness issue with objects

[Christian Brabandt]

patch 9.1.2096: Vim9: truthiness issue with objects

Commit: https://github.com/vim/vim/commit/4a08c8b5d4729b4d5eafe11886611d2053672384
Author: Yegappan Lakshmanan <yega...@yahoo.com>
Date: Mon Jan 19 18:21:12 2026 +0000

patch 9.1.2096: Vim9: truthiness issue with objects

Problem: Vim9: truthiness issue with objects
(kennypete)
Solution: Return true for an non-null object
(Yegappan Lakshmanan)

related: #19173
closes: #19213

Signed-off-by: Yegappan Lakshmanan <yega...@yahoo.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt
index 57ebec375..a15b19391 100644
--- a/runtime/doc/vim9.txt
+++ b/runtime/doc/vim9.txt
@@ -1,4 +1,4 @@
-*vim9.txt* For Vim version 9.1. Last change: 2025 Dec 03
+*vim9.txt* For Vim version 9.1. Last change: 2026 Jan 19


VIM REFERENCE MANUAL by Bram Moolenaar
@@ -1084,8 +1084,11 @@ empty list and dict is falsy:
special true or v:true
job when not NULL
channel when not NULL
- class when not NULL
- object when not NULL (TODO: when isTrue() returns true)
+ class not applicable
+ object when not NULL
+ enum not applicable
+ enum value always
+ typealias not applicable

The boolean operators "||" and "&&" expect the values to be boolean, zero or
one: >
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 8e5a53d51..87b821638 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -231,6 +231,38 @@ def Test_expr1_falsy()
END
v9.CheckDefAndScriptSuccess(lines)

+ # falsy operator with objects and enum values
+ lines =<< trim END
+ vim9script
+ class C
+ endclass
+
+ var c = C.new()
+ assert_equal(c, c ?? 'falsy')
+ assert_equal('truthy', !c ?? 'truthy')
+ assert_equal('falsy', null_object ?? 'falsy')
+ assert_equal(true, !null_object ?? 'truthy')
+
+ enum Color
+ Red,
+ Blue
+ endenum
+ assert_equal(Color.Red, Color.Red ?? 'falsy')
+ assert_equal('truthy', !Color.Red ?? 'truthy')
+
+ def Fn()
+ var c2 = C.new()
+ assert_equal(c2, c2 ?? 'falsy')
+ assert_equal('truthy', !c2 ?? 'truthy')
+ assert_equal('falsy', null_object ?? 'falsy')
+ assert_equal(true, !null_object ?? 'truthy')
+ assert_equal(Color.Red, Color.Red ?? 'falsy')
+ assert_equal('truthy', !Color.Red ?? 'truthy')
+ enddef
+ Fn()
+ END
+ v9.CheckSourceScriptSuccess(lines)
+
var msg = "White space required before and after '??'"
call v9.CheckDefAndScriptFailure(["var x = 1?? 'one' : 'two'"], msg, 1)
call v9.CheckDefAndScriptFailure(["var x = 1 ??'one' : 'two'"], msg, 1)
diff --git a/src/version.c b/src/version.c
index 4b9fa37d7..cbf48413c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 2096,
/**/
2095,
/**/
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 2b2d59ad5..9763cd95b 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -8127,12 +8127,15 @@ tv2bool(typval_T *tv)
#endif
case VAR_BLOB:
return tv->vval.v_blob != NULL && tv->vval.v_blob->bv_ga.ga_len > 0;
+
+ case VAR_OBJECT:
+ return tv->vval.v_object != NULL;
+
case VAR_UNKNOWN:
case VAR_ANY:
case VAR_VOID:
case VAR_INSTR:
case VAR_CLASS:
- case VAR_OBJECT:
case VAR_TYPEALIAS:
break;
}