2499 – Template alias default value cannot be template instantiation

Simple case:
void foo(T)()
{
}
struct f(alias func=foo!(int))
{
}
void main()
{
 f!() myf;
}
Error in 1.036:
Error: foo!(int) is not a symbol
Error in 2.019:
testtemplatealias.d(5): Error: foo!(int) is used as a type
testtemplatealias.d(11): template instance f!() does not match template declaration f(alias func = foo!(int))
testtemplatealias.d(11): Error: f!() is used as a type
testtemplatealias.d(11): variable testtemplatealias.main.myf voids have no value
Workaround is to alias the default parameter before using as the default parameter:
alias foo!(int) defaultFoo;
struct f(alias func=defaultFoo)
{
}

Note that in the case where you want the default value to depend on other template parameters, such as:
struct f(T, alias func=foo!(T))
This is much tricker. I found that the cleanest way to workaround is to avoid default parameters, and just alias the less specific ones:
struct f(T, alias func)
{
}
template f(T)
{
 alias f!(T, foo!(T)) f;
}

Fixed dmd 1.038 amd 2.022