Bug 22446 – isInputRange fails to recognize range if element type is nested struct that has a copy ctor

import std.range; void main() { struct S { // comment this ctor to make the issue disappear this(return ref scope const S) {} void remainNestedEvenIfCtorAboveIsCommented() {} } static assert(__traits(isNested, S)); // passes static assert(isInputRange!(S[])); // fails } --- Removing the copy ctor makes the check pass, so this might be a dmd issue?.. It would seem that the problematic check in isInputRange is the is(typeof((return ref R r) => r.front)) which triggers the infamous "cannot access frame pointer", but not when the copy ctor is not present.

IMHO, this isn't a Phobos bug. As you've already put it, it's the infamous "cannot access frame pointer" issue. Moving it to dmd.

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