Bug 9681 – std.variant.Algebraic with const members

This code compiles with dmd 2.063alpha: import std.variant: Algebraic; struct A {} alias Foo = Algebraic!(A); void main() { const A bar; auto spam = Foo(bar); // line 6. assert(spam.peek!(const A)); // No assertion failure assert(spam.peek!A); // Assertion failure } And at runtime it asserts at line 8: core.exception.AssertError@test2(8): Assertion failure I think that maybe line 6 should be refused, otherwise it becomes hard to catch all possible things that can be inside "spam". In this program bar is like an Algebraic!(A, const A).