[Issue 5787] Invisible multiple function calls when using .tupleof

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5787



--- Comment #2 from kennytm at gmail.com 2011-03-28 12:02:32 PDT ---
The problem is in .tupleof, where (expr).tupleof is rewritten to
TypeTuple!((expr).field0, (expr).field1, (expr).field2, ...) even if expr have
side effect, e.g.

-----------

import std.c.stdio : printf;

struct S {
    int x;
    int y;
}

void main() {
    cast(void)
    (printf("Hi\n"), S(2,3)).tupleof;
}

// print "Hi" twice.

-----------

This should be rewritten as (tmp=expr, TypeTuple!(tmp.field0, ...)).

(The ',' here is a comma expression.)

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