[Issue 6891] New: template with uint value parameter causes several issues

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6891

           Summary: template with uint value parameter causes several
                    issues
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: revcompgeek at gmail.com


--- Comment #0 from Matt Peterson <revcompgeek at gmail.com> 2011-11-04 16:31:32 PDT ---
This bug is closely related to issue 4960 and issue 6745, although I don't
think it's an exact duplicate.

One of the simplest test cases I could come up with:
----
struct S(uint N) {
    void f(S!N u) { }
}

alias S!1 A;

void main()
{
    A().f(A());
}
----

Which gives the following error messages:
templatetest.d(10): Error: function templatetest.S!(1).S.f (S!(N) u) is not
callable using argument types (S!(1))
templatetest.d(10): Error: cannot implicitly convert expression (S()) of type
S!(1) to S!(N)

In this form it is fairly easy to work around, by either changing uint to int
in the struct declaration or using S!1u instead of S!1. However, I derived this
from a slightly different test case:
----
struct S(int N, T) {
    void f(U)(S!(N, U) u) { }
}

alias S!(1, void) A;

void main()
{
    A().f(A());
}
----

Which gives me these error messages:
templatetest.d(10): Error: template templatetest.S!(1,void).S.f(U) does not
match any function template declaration
templatetest.d(10): Error: template templatetest.S!(1,void).S.f(U) cannot
deduce template function from argument types !()(S!(1,void))

In this version, changing the type of N or 1 doesn't do anything, and I have
not found a way to work around it.

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