From baf6ede6de920f17df6c48aa5eac32b6ea30ca10 Mon Sep 17 00:00:00 2001
From: Vladimir Panteleev <git@cy.md>
Date: Wed, 14 Jul 2021 20:50:27 +0000
Subject: [PATCH] Fix Issue 22125 - std.process.Config was changed to a struct
 but miss operator overloads

---
 std/process.d | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/std/process.d b/std/process.d
index 0eeb7095c..7ac26aff2 100644
--- a/std/process.d
+++ b/std/process.d
@@ -2131,9 +2131,20 @@ struct Config
     enum Config inheritFDs = Config(Flags.inheritFDs); /// ditto
     enum Config detached = Config(Flags.detached); /// ditto
     enum Config stderrPassThrough = Config(Flags.stderrPassThrough); /// ditto
-    Config opBinary(string op : "|")(Config other)
+    Config opUnary(string op)()
+    if (is(typeof(mixin(op ~ q{flags}))))
     {
-        return Config(flags | other.flags);
+        return Config(mixin(op ~ q{flags}));
+    } /// ditto
+    Config opBinary(string op)(Config other)
+    if (is(typeof(mixin(q{flags} ~ op ~ q{other.flags}))))
+    {
+        return Config(mixin(q{flags} ~ op ~ q{other.flags}));
+    } /// ditto
+    Config opOpAssign(string op)(Config other)
+    if (is(typeof(mixin(q{flags} ~ op ~ q{=other.flags}))))
+    {
+        return Config(mixin(q{flags} ~ op ~ q{=other.flags}));
     } /// ditto
 
     version (StdDdoc)
@@ -2151,6 +2162,16 @@ struct Config
     }
 }
 
+// https://issues.dlang.org/show_bug.cgi?id=22125
+@safe unittest
+{
+    Config c = Config.retainStdin;
+    c |= Config.retainStdout;
+    c |= Config.retainStderr;
+    c &= ~Config.retainStderr;
+    assert(c == (Config.retainStdin | Config.retainStdout));
+}
+
 /// A handle that corresponds to a spawned process.
 final class Pid
 {