Bug 1498 – Recursive mixins are not allowed

I and other people have asked in the NG about recursive mixins and got no answer. Recursive mixins are probably tricky to implement but until they are implemented or the specs clearly prohibit them, it is a bug (and major one with respect to what I'm trying to do). template Foos(Funcs...) { static if (Funcs.length) { mixin Foos!(Funcs[1..$]); } } mixin Foos!(void function(), void function(int)); Error: mixin hello.Foos!(void(*)(),void(*)(int)).Foos!(void(*)(int)).Foos!() recursive mixin instantiation

Reply to [email protected], > http://d.puremagic.com/issues/show_bug.cgi?id=1498 > > Summary: Recursive mixins are not allowed > Product: D > Version: 1.021 > Platform: PC > OS/Version: Windows > Status: NEW > Severity: normal > Priority: P2 > Component: DMD > AssignedTo: [email protected] > ReportedBy: [email protected] > I and other people have asked in the NG about recursive mixins and got > no answer. Recursive mixins are probably tricky to implement but until > they are implemented or the specs clearly prohibit them, it is a bug > (and major one with respect to what I'm trying to do). > > template Foos(Funcs...) > { > static if (Funcs.length) > { > mixin Foos!(Funcs[1..$]); > } > } > mixin Foos!(void function(), void function(int)); > > Error: mixin > hello.Foos!(void(*)(),void(*)(int)).Foos!(void(*)(int)).Foos!() > recursive mixin instantiation > static foreach should cover this

True, but it's going to be D 2.0 feature and remain a bug/undefined behavior in D 1.0 (which I am confined to because of Tango/DFL).

The test case passes for me with DMD 1.045 and seems to behave correctly.