Deprecate callStructDtorsDuringGC

src/rt/lifetime.d

@@ -41,13 +41,19 @@ private
 
 private immutable bool callStructDtorsDuringGC;
 
+deprecated ("The callStructDtorsDuringGC feature will be removed in the next release cycle.")
+private pragma(inline, true) void setCallStructDtorsDuringGC(bool flag)
+{
+    cast() callStructDtorsDuringGC = flag;
+}
+
 extern (C) void lifetime_init()
 {
     // this is run before static ctors, so it is safe to modify immutables
     import rt.config;
     string s = rt_configOption("callStructDtorsDuringGC");
     if (s != null)
-        cast() callStructDtorsDuringGC = s[0] == '1' || s[0] == 'y' || s[0] == 'Y';
+         setCallStructDtorsDuringGC = s[0] == '1' || s[0] == 'y' || s[0] == 'Y';
     else
         cast() callStructDtorsDuringGC = true;
 }