[Issue 12698] Overloads from multiple modules implicitly merge into a single overloadset

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12698

--- Comment #3 from Andrej Mitrovic <andrej.mitrovich at gmail.com> ---
(In reply to Kenji Hara from comment #2)
> Why do you think this is an issue? std.algorithm.copy does not match to
> (char[], char[]) arguments, so std.file.copy is always chosen.

Because it's accidental. char[] is not an output range, but byte[] is. So the
user might without notice call functions with completely different semantics:

-----
/// Just image if the user did "import std;" 
/// and the "std" package pull was merged,
/// it would be similar to the below situation:

import std.algorithm;
import std.array;
import std.conv;
import std.exception;
import std.file;
import std.range;
import std.stdio;
import std.string;
import std.traits;
import std.typecons;
import std.typetuple;

void main()
{
    byte[] src = [1, 2, 3];
    byte[] tgt = new byte[](3);
    copy(src, tgt);
    writeln(tgt);  // [1, 2, 3]

    char[] srcname = "newname.txt".dup;
    char[] tgtname = "oldname.txt".dup;

    // actually *writes to a file*, 
    // potentially overwriting existing contents
    copy(srcname, tgtname);
}
-----

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