http://d.puremagic.com/issues/show_bug.cgi?id=9210

           Summary: [2.061 beta] Import cycle causes unpredictable compile
                    errors
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: sludwig@outerproduct.org


--- Comment #0 from Sönke Ludwig <sludwig@outerproduct.org> 2012-12-26 13:26:51 PST ---
Created an attachment (id=1173)
Reproduction case

Compiling the following three files using `dmd -c a.d` causes the compiler to fail compiling code in std.complex:

a.d
---
import b;
interface A {}
---

b.d
---
import c;
import std.datetime;
interface B : A {}
---

c.d
---
import a;
interface C : A {}
---

output:
---
C:\D\dmd2\windows\bin\..\..\src\phobos\std\complex.d(678): Error: struct
std.complex.Complex does not match any template declaration
C:\D\dmd2\windows\bin\..\..\src\phobos\std\complex.d(678): Error:
Complex!(real) is used as a type
[...]
---

The error occurs for different configurations of imports and triggers errors in completely different locations. Does not occur using DMD 2.060.

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--- Comment #1 from Sönke Ludwig <sludwig@outerproduct.org> 2012-12-26 13:34:05 PST ---
Just noticed that `b.d` is missing an `import a;`. This does not influence the error, though. Note that there is absolutely no connection to the user's code, so this is hard to track down.

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--- Comment #2 from Kenji Hara <k.hara.pg@gmail.com> 2012-12-26 21:13:07 PST ---
This is a compiler regression.
The issue occurs also with the combination 2.061alpha dmd + 2.060release
Phobos.

A dmd commit which the issue introduced is: https://github.com/D-Programming-Language/dmd/commit/c34c5fb0e67f7c48bb683ef409378fde6db33088

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com


--- Comment #3 from Walter Bright <bugzilla@digitalmars.com> 2012-12-26 21:15:25 PST ---
If there isn't an obvious fix, I suggest reverting that fix, reopening its corresponding bug report, and add this example to the test suite.

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic, pull


--- Comment #4 from Kenji Hara <k.hara.pg@gmail.com> 2012-12-26 23:08:27 PST ---
(In reply to comment #3)
> If there isn't an obvious fix, I suggest reverting that fix, reopening its corresponding bug report, and add this example to the test suite.

I made an obvious fix. https://github.com/D-Programming-Language/dmd/pull/1412

This is a diagnostic bug. The fake errors were made by the incompletion of Phobos template instantiating.

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--- Comment #5 from github-bugzilla@puremagic.com 2012-12-27 01:20:52 PST ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/446d11da15197117f6e2acd8853accd7c6d22b54 fix Issue 9210 - [2.061 beta] Import cycle causes unpredictable compile errors

https://github.com/D-Programming-Language/dmd/commit/4633b1336ba0aca1c260bcfd87fabb24f0d06692 Merge pull request #1412 from 9rnsr/fix9210

Issue 9210 - [2.061 beta] Import cycle causes unpredictable compile errors

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Walter Bright <bugzilla@digitalmars.com> changed:

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


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--- Comment #6 from github-bugzilla@puremagic.com 2012-12-28 11:11:22 PST ---
Commit pushed to staging at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/094f8f7687ea21df4670efd33338e6c69478a019 Merge pull request #1412 from 9rnsr/fix9210

Issue 9210 - [2.061 beta] Import cycle causes unpredictable compile errors

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