SumType! seemingly results in cryptic error, with dub suggesting to make an issue ticket

[Gimbles]

My code is this
```d
struct ConstValueIndex
{
     ushort const_value_index;
}

struct EnumConstValue
{
     ushort type_name_index;
     ushort const_name_index;
}

struct ClassInfoIndex
{
     ushort class_info_index;
}

struct AnnotationValue
{
     Annotation annotation_value;
}

struct ArrayValue
{
     ElementValue[] values;
}

alias ElementValue = SumType!(
     ConstValueIndex,
     EnumConstValue,
     ClassInfoIndex,
     AnnotationValue,
     ArrayValue,
);
```

It results in quite a cryptic error
```d
Error: unknown, please file report on issues.dlang.org
/usr/include/dlang/dmd/std/meta.d(632,42): Error: template 
instance `std.sumtype.matchImpl!(Flag.yes, 
destroyIfOwner).matchImpl!(SumType!(ConstValueIndex, 
EnumConstValue, ClassInfoIndex, AnnotationValue, 
ArrayValue)).matchImpl.valueTypes!4LU.fun!0LU` error instantiating
/usr/include/dlang/dmd/std/sumtype.d(1931,32):        
instantiated from here: `Map!(getType, 0LU)`
/usr/include/dlang/dmd/std/sumtype.d(1967,51):        
instantiated from here: `valueTypes!4LU`
/usr/include/dlang/dmd/std/sumtype.d(1649,52):        
instantiated from here: `matchImpl!(SumType!(ConstValueIndex, 
EnumConstValue, ClassInfoIndex, AnnotationValue, ArrayValue))`
/usr/include/dlang/dmd/std/sumtype.d(752,17):        instantiated 
from here: `match!(SumType!(ConstValueIndex, EnumConstValue, 
ClassInfoIndex, AnnotationValue, ArrayValue))`
source/parser/definitions/attributes.d(262,22):        
instantiated from here: `SumType!(ConstValueIndex, 
EnumConstValue, ClassInfoIndex, AnnotationValue, ArrayValue)`
/usr/include/dlang/dmd/std/sumtype.d(1985,13):        while 
evaluating: `static assert((__error)(hid))`
Error /usr/bin/dmd failed with exit code 1.
```

(I tried all three compilers, happens in all)

Should I make an issue for this as it suggests?