[Issue 3762] New: Restrictive functionality for template instance recursive expansion

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3762

           Summary: Restrictive functionality for template instance
                    recursive expansion
           Product: D
           Version: 2.039
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: curoles at yahoo.com
                CC: curoles at yahoo.com


--- Comment #0 from Igor Lesik <curoles at yahoo.com> 2010-01-31 14:30:04 PST ---
How to reproduce:
template static_factorial(int n)
{
    static if (n == 1)
        const static_factorial = 1;
    else
        const static_factorial = n * static_factorial!(n-1);
}

void main()
{
    writefln("502!=%d", static_factorial!(502));

Error: template instance factorial.static_factorial!(2) recursive expansion

Max recursion depth 500 is hardcoded in template.c function
TemplateInstance::semantic() line 3738 if (++nest > 500). While 500 is
reasonable practical limit, it would be nice to be able to control it somehow,
with #pragma for example.

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