http://d.puremagic.com/issues/show_bug.cgi?id=10141

           Summary: wrong error message with Tuple!(int) : Error: static
                    assert  "Cannot put a char[] into a Appender!(string)"
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: thelastmammoth@gmail.com


--- Comment #0 from thelastmammoth@gmail.com 2013-05-23 02:16:28 PDT ---
----
main.d:
import std.typecons;
import std.typecons:unexisting_symbol;
Tuple!(int) fun(){return Tuple!(int).init;}
----

dmd 2.062:
dmd main.d:
main.d:Error: module std.typecons import 'unexisting_symbol' not found
(which is correct)

dmd 2.063(beta5):
dmd main.d:

main.d: Error: module std.typecons import 'unexisting_symbol' not found
dmd2_063_beta5/osx/bin/../../src/phobos/std/range.d(611): Error: static assert
"Cannot put a char[] into a Appender!(string)"
dmd2_063_beta5/osx/bin/../../src/phobos/std/format.d(1433):        instantiated
from here: put!(Appender!(string), char[])
dmd2_063_beta5osx/bin/../../src/phobos/std/format.d(1335):        instantiated
from here: formatUnsigned!(Appender!(string), char)
dmd2_063_beta5/osx/bin/../../src/phobos/std/format.d(1309):        instantiated
from here: formatIntegral!(Appender!(string), ulong, char)
dmd2_063_beta5/osx/bin/../../src/phobos/std/format.d(2950):        ... (3
instantiations, -v to show) ...
dmd2_063_beta5/osx/bin/../../src/phobos/std/typecons.d(326):
instantiated from here: format!(char, ulong, ulong)
main.d(3):        instantiated from here: Tuple!(int)

(which is incorrect : the stuff after the 1st line doesnt' make sense)

I'm on osx if that matters.

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich@gmail.com


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-05-23 19:14:33 PDT ---
Looks like another case of http://d.puremagic.com/issues/show_bug.cgi?id=9549. That one was closed after it was fixed by accident: https://github.com/D-Programming-Language/dmd/pull/1676#issuecomment-14059594

Apparently it's resurfaced again in this new test-case.

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--- Comment #2 from Kenji Hara <k.hara.pg@gmail.com> 2013-05-25 21:20:49 PDT ---
(In reply to comment #1)
> Looks like another case of http://d.puremagic.com/issues/show_bug.cgi?id=9549. That one was closed after it was fixed by accident: https://github.com/D-Programming-Language/dmd/pull/1676#issuecomment-14059594
> 
> Apparently it's resurfaced again in this new test-case.

This 'regression' is not caused by the compiler change.
It is introduced by a Phobo change:
https://github.com/D-Programming-Language/phobos/commit/895550649f07dabfb0d8fc7693027e86065b3e57

I think that essentially incomplete compiler's template error report mechanism would be the root cause of such redundant errors.

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
           Severity|regression                  |normal


--- Comment #3 from Kenji Hara <k.hara.pg@gmail.com> 2013-05-27 05:58:54 PDT ---
I think this is not a blocker regression against 2.063 release. Change the importance.

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Henning Pohl <henning@still-hidden.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |henning@still-hidden.de
           Severity|normal                      |critical


--- Comment #4 from Henning Pohl <henning@still-hidden.de> 2013-07-13 12:41:26 PDT ---
A bit more reduced:

---
import std.typecons;

lets cause_an_error;

Tuple!int tf;
---

I have seen this bug hiding other erros, so only the "static assert "Cannot put a char[] into a Appender!(string)"" error and the instantiation trace shows up. This becomes really really bad in big code bases. I've experienced this multiple times.

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--- Comment #5 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-07-13 13:26:19 PDT ---
(In reply to comment #4)
> This becomes really really bad in big code bases. I've experienced this multiple times.

Yeah me too, lately quite often.

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull


--- Comment #6 from Kenji Hara <k.hara.pg@gmail.com> 2013-07-13 23:48:30 PDT ---
https://github.com/D-Programming-Language/dmd/pull/2346

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--- Comment #7 from github-bugzilla@puremagic.com 2013-07-15 00:19:47 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/8c5cce3e6ffd63ad3af23caf2e15ea7a3eabeea5
fix Issue 10141 - wrong error message with Tuple!(int) : Error: static assert
"Cannot put a char[] into a Appender!(string)"

Essentially it's bad code if it branches based on the condition `global.errors != 0`.

https://github.com/D-Programming-Language/dmd/commit/390a9340cad6f9c44757cd4782792b08d95a56ba Merge pull request #2346 from 9rnsr/fix10141

Issue 10141 - wrong error message with Tuple!(int) : Error: static assert
"Cannot put a char[] into a Appender!(string)"

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


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