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digitalmars.D.bugs - [Issue 7263] New: Tuple slicing + -O switch causes "used before set" error

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7263

           Summary: Tuple slicing + -O switch causes "used before set"
                    error
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: k.hara.pg gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg gmail.com> 2012-01-09 19:24:23 PST ---
Sample code:
----
template TypeTuple(T...){ alias T TypeTuple; }

struct tuple
{
    TypeTuple!(int, int) field;
    alias field this;
}

auto front(T)(ref T arr){ return arr[0]; }

void main() {
    auto bars = [tuple(0, 0), tuple(1, 1)];
    auto spam = bars.front[1..2];   //
}

Output:
----
Error: variable __tup3 used before set

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7263


Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


--- Comment #1 from Kenji Hara <k.hara.pg gmail.com> 2012-01-09 20:03:31 PST ---
https://github.com/D-Programming-Language/dmd/pull/609

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prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7263


Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Tuple slicing + -O switch   |Tuple indexing/slicing + -O
                   |causes "used before set"    |switch causes "used before
                   |error                       |set" error


--- Comment #2 from Kenji Hara <k.hara.pg gmail.com> 2012-01-12 00:59:46 PST ---
Tuple indexing has same problem.

template TypeTuple(T...){ alias T TypeTuple; }

struct tuple
{
    TypeTuple!(int, int) field;
    alias field this;
}

auto front(T)(ref T arr){ return arr[0]; }

void main() {
    auto bars = [tuple(0, 0), tuple(1, 1)];
    auto spam1 = bars.front[1];      // indexing
    auto spam2 = bars.front[1..2];   // slicing
}

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Jan 12 2012
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7263


yebblies <yebblies gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |yebblies gmail.com
         Resolution|                            |FIXED


--- Comment #3 from yebblies <yebblies gmail.com> 2012-02-17 22:42:39 EST ---
Works for me, presumably fixed by the fix to issue 4940

https://github.com/D-Programming-Language/dmd/commit/d6ede2edc28c94b6b3372eb1301cf300b0860eb6

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