diff --git a/src/testdir/test_fold.vim b/src/testdir/test_fold.vim
index 3bdd99f..2618084 100644
--- a/src/testdir/test_fold.vim
+++ b/src/testdir/test_fold.vim
@@ -1476,6 +1476,8 @@
   call assert_equal([0, 1, 1, 2, 2], range(1, 5)->map('foldlevel(v:val)'))
   call append(2, 'line 2.5')
   call assert_equal([0, 1, 0, 1, 2, 2], range(1, 6)->map('foldlevel(v:val)'))
+  3d
+  call assert_equal([0, 1, 1, 2, 2], range(1, 5)->map('foldlevel(v:val)'))
   bw!
 endfunc
 
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 182d570..2a97375 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -3363,8 +3363,11 @@
   cgetexpr ['Compiler: ' . repeat('a', 1015), 'File1:10:Hello World']
 
   set efm=%DEntering\ directory\ %f,%f:%l:%m
-  cgetexpr ['Entering directory ' . repeat('a', 1006),
-	      \ 'File1:10:Hello World']
+  let lines =<< trim eval END
+    Entering directory $"{repeat('a', 1006)}"
+    File1:10:Hello World
+  END
+  cgetexpr lines
   set efm&vim
 endfunc
 
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index e83e320..0243595 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -3364,6 +3364,22 @@
   v9.CheckDefAndScriptFailure(['searchdecl(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   v9.CheckDefAndScriptFailure(['searchdecl("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
   v9.CheckDefAndScriptFailure(['searchdecl("a", true, 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+
+  # search for an empty string declaration
+  var lines: list<string> =<< trim END
+    int var1;
+
+    {
+       int var2;
+       var1 = 10;
+    }
+  END
+  new
+  setline(1, lines)
+  cursor(5, 4)
+  searchdecl('')
+  assert_equal([3, 1], [line('.'), col('.')])
+  bw!
 enddef
 
 def Test_searchpair()