Summary: template "is not an expression", "of type void", and
                    "is not evaluatable at compile time" combo error.
           Product: D
           Version: 2.032
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD

--- Comment #0 from Chad Joan <> 2009-09-22 00:52:54 PDT ---
template ouch(alias members)
    static if ( members.length == 0 )
        const bool ouch = true;
        // If you want to compile successfully, just comment out this one line.
        enum foo = "sup.";

        // Commenting the true removes the "is not an expression" error.
        // Commenting out the recursion leaves only the
        //     "is not evaluatable at compile time" error.
        // Reversing the order has the same effect as removing the true.
        // See what combinations YOU can come up with! ;)
        const bool ouch =
            true &&

static assert( ouch!(["a","b"]) );

void main() {}

As the comments suggest, things can be altered slightly to change what error
messages are produced.

The error messages it produces in its virgin (and most verbose form) are as
main.d(16): Error: ouch!(["b"]) is not an expression
main.d(16): Error: cannot implicitly convert expression (!!ouch!(["b"])) of
type void to const(bool)
main.d(21): Error: template instance main.ouch!(["a","b"]) error instantiating
main.d(21): Error: static assert  (ouch!(["a","b"])) is not evaluatable at
compile time

I'm actually not sure if it's supposed to be possible to pass string[]'s as
alias parameters (passing them as straight string[]'s seems forbidden), but
either way there is /something/ wrong.

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