From e5e9caa2ee2188444e06ea1e162eb23375ca7538 Mon Sep 17 00:00:00 2001
From: Mikael Magnusson <mikachu@gmail.com>
Date: Thu, 4 Jun 2026 09:06:02 +0200
Subject: 54674: ::= didn't respect parameter flags

The documentation says
    ${name::=word}
          In  the first form, if name is unset then set it to word; in
          the second form, if name is unset or null then set it to word;
          and in the third form, unconditionally  set name to word.  In
          all forms, the value of the parameter is then substituted.

Particularly that "the value of the parameter is substituted", not "the
word is substituted".

This is what happens before the fix, and similarly for array flags like "unique":

% typeset -E3 fl; hi=5; echo ${fl::=hi}
hi
% echo $fl
5.00e+00
---
 Test/D04parameter.ztst | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'Test')

diff --git a/Test/D04parameter.ztst b/Test/D04parameter.ztst
index 68c4ec288..57de28c72 100644
--- a/Test/D04parameter.ztst
+++ b/Test/D04parameter.ztst
@@ -82,6 +82,19 @@
 >wasnull2d
 >wasnull2d
 
+  typeset -Z3 zerothree
+  print ${zerothree::=15}
+  typeset -E3 ethree
+  five=5
+  print ${ethree::=five}
+  typeset -a -U uniquearr
+  typeset -a duplicates=(1 2 1 1 2 3)
+  print ${(A)uniquearr::=$duplicates}
+0:::= respects expansion flags
+>015
+>5.00e+00
+>1 2 3
+
   unset array
   print ${#${(A)=array=word}}
 0:${#${(A)=array=word}} counts array elements
-- 
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