Strange cast error in compile-time function

[Max Samukha]

On Tue, 24 Jul 2007 18:09:18 +0200, Stephan Kochen <stephan at kochen.nl>
wrote:

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>Hello all,
>
>I'm stuck on something. I'm writing some compile-time stuff to generate
>a function that gets me the Unicode general category for a dchar. I have
>some compile-time functions that read from the TXTs from the Unicode
>Character Database and create the actual D code for me.
>
>The source code is attached.
>
>The functions work at run-time and output the correct D code, when I
>print the string return value using writefln. But when I try to use a
>mixin to 'paste' it in a function at compile-time, I get a vague error:
>	"Error: cannot cast int to RowData"
>(and nothing else.)
>
>RowData is a struct I use. It might be interesting to note that this
>happens with DMD 1.0 (and the GDC based on it), but with DMD 1.020 I get
>a slightly different (but equally vague) error:
>	"Error: cannot cast int to char[][]"
>
>I've been staring at this for hours. Halp! :)
>
>Thanks in advance,
>- -- Stephan
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There are still bugs in the compiler that make writing compile-time
functions a difficult task. In your case, the error is caused by
retval not being explicitly initialized (in parseUnicodeCSV). Try

RowData retval = RowData.init;

But even if it is, the function still cannot be evaluated at
compile-time. Trying to figure out why.