...re going to be relying on user data to optimize this for dmd. Either from...

...hot loop. You profiled and now the data tells you how likely each branch was...

...a link to type sequences here:
https://dlang.org/spec/type.html#derived-data-types

...specify the underlying data type of the enum. This determines the data type in which...

...Besides

Test[8] test = Test.init; // <- works

Data data = { test: Test.init }; // <- works

char[256...

...struct Data
{
    Test[8] test;
}

void add(Data data)
{
}

extern(C) void main()
{
    add(Data...

...an array of 8 elements
}

void add(Data data)
{
}

void func(Test t) {}

extern(C...

...struct Data
{
    Test[8] test;
}

void add(Data data)
{
}

extern(C) void main()
{
    add( Data...

...struct Data
{
    Test[8] test;
}

void add(Data data)
{
}

extern(C) void main()
{
    add( Data...

...can be computed at runtime from the data stored in the tag field. It's...