cat > bug.d << CODE
import bug2;

private void foo() {}
void main() { bar!foo(); }
CODE

cat > bug2.d << CODE
void bar(alias foo)() { foo(); }
CODE

----
dmd -c bug.d
----
bug2.d(1): Error: function bug.foo is not accessible from module bug2
bug.d(4): Error: template instance bug2.bar!(foo) error instantiating
----

The access check should be performed on the template instance argument, but not when using the aliased symbol in the template declaration module.
So template alias parameters should behave like public aliases to private symbols.