Compiler version: DMD64 D Compiler v2.058 on 64-bit Linux

The following code causes compiler errors:

----------
struct Boo(size_t dim){int a;}
struct Baa(size_t dim){Boo!dim a;}
//struct Baa(size_t dim){Boo!1 a;} //(1) This version causes no errors

auto foo()(Boo!1 b){return b;}
//auto fuu(Boo!1 b){return b;} //(2) This line neutralizes the error

void main()
{
    Baa!1 a; //(3) This line causes the error message
    Baa!2 a1;
    auto b = foo(Boo!1(1));
}
----------

Error messages:

----------
test.d(12): Error: template test.foo() does not match any function template declaration
test.d(12): Error: template test.foo() cannot deduce template function from argument types !()(Boo!(1LU))
----------

These errors occure only if there is line markes as (3).

If the definition of `Baa` is changed with the one marked as (1) there is no errors.

If there is line marked as (2) there is no errors (even though the function `fuu` is not used anywhere).