DMD v2.084.0-beta.1 regression in Tuple.toHash() ?

[Per Nordlöw]

My project fails to build with DMD v2.084.0-beta.1 as

In function ”const pure nothrow @nogc @safe ulong 
std.typecons.Tuple!(char, char).Tuple.toHash()”:
/usr/include/dmd/phobos/std/typecons.d:1179: undefined reference 
to ”pure nothrow @nogc @safe ulong 
object.hashOf!(const(char)).hashOf(ref const(char))”
/usr/include/dmd/phobos/std/typecons.d:1179: undefined reference 
to ”pure nothrow @nogc @safe ulong 
object.hashOf!(const(char)).hashOf(ref const(char))”

Is this a regression?