[Issue 4842] New: Wrong code with template literals

d-bugmail at puremagic.com d-bugmail at puremagic.com
Wed Sep 8 20:03:03 PDT 2010


http://d.puremagic.com/issues/show_bug.cgi?id=4842

           Summary: Wrong code with template literals
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: dsimcha at yahoo.com


--- Comment #0 from David Simcha <dsimcha at yahoo.com> 2010-09-08 20:02:38 PDT ---
The following code was written for Rosetta Code and is intended to find all
factors of an integer.  It produces wrong results.  The exact wrong results
depend on whether inlining is enabled.

import std.range, std.algorithm, std.stdio;

auto factors(I)(I num) {
    return filter!((i) { return num % i == 0; })(
        iota(1, num + 1)
    );
}

void main() {
    writeln(factors(36));
}


If I change the line with the lambda from a template literal to a delegate
literal:

return filter!((I i) { return num % i == 0; })

then it works.

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