Hey,

the code bellow compiles with dmd 2.071.2, but doesn't compile with the same command with dmd 2.072.0 beta2. Maybe someone knows what's going wrong or whether it is a bug in 2.071.2/2.072.0 (it is a reduced part from memutils):

app.d:
import memutils.utils;

struct HashMap(Key, Value)
{
	int[] m_table; // NOTE: capacity is always POT
	
	~this()
	{
		freeArray!(int)(m_table);
	}
}

----------------------------------------------------------
module memutils.allocators;

final class FreeListAlloc()
{
	import memutils.utils : MallocAllocator;
}

----------------------------------------------------------
module memutils.utils;

import memutils.allocators;

final class MallocAllocator
{
}

final class AutoFreeListAllocator()
{
	FreeListAlloc!()[12] m_freeLists;
}

alias LocklessAllocator = AutoFreeListAllocator!();

R getAllocator(R)() {
	return new R;
}

void freeArray(T)(auto ref T[] array)
{
	auto allocator = getAllocator!(LocklessAllocator); // freeing. Avoid allocating in a dtor
}
--------------------------------------------------------


The command to compile:
dmd -c -Imemutils/ app.d -of/dev/null


Builds with the latest stable. Fails with the beta:

memutils/utils.d(9): Error: class memutils.utils.AutoFreeListAllocator!().AutoFreeListAllocator no size because of forward reference
memutils/utils.d(14): Error: template instance memutils.utils.AutoFreeListAllocator!() error instantiating
memutils/utils.d(11): Error: template instance memutils.allocators.FreeListAlloc!() error instantiating
memutils/utils.d(14):        instantiated from here: AutoFreeListAllocator!()
app.d(9): Error: template instance memutils.utils.freeArray!int error instantiating
app.d(13):        instantiated from here: HashMap!(int, uint)



Compiles with the lates beta if:
dmd -c -Imemutils/ memutils/* app.d -of/dev/null

https://github.com/dlang/dmd/pull/5500 maybe this