[Issue 12610] New: std.algorithm.reduce (with seed) and array-wise operation produces incorrect result

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12610

          Issue ID: 12610
           Summary: std.algorithm.reduce (with seed) and array-wise
                    operation produces incorrect result
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: acehreli at yahoo.com

The following program produces incorrect and random results like [373728176],
[-2022052576], etc.

(Build *without* -inline.)

import std.stdio;
import std.algorithm;

void main()
{
    int[] arr = [ 0 ];

    int[1] seed;
    int[] result = reduce!((sum, _) => sum[])(seed, arr);

    writefln("%s", result);
}

Any of the following is sufficient to cover up the issue:

* Building with -inline

* Not slicing sum inside the lambda but returning it directly (i.e. => sum)

* Inserting a writefln expression inside the lambda

Ali

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