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digitalmars.D.bugs - [Issue 11937] New: Unresolved Symbol when template is instantiated as default value for function in another module

reply d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11937

           Summary: Unresolved Symbol when template is instantiated as
                    default value for function in another module
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: blah38621 gmail.com



I wish I could think of a shorter name for this, but oh well. This is an issue
caused by one of the PRs merged within the last 24 hours. After reducing my
codebase with dustmite, this is what I get:

--------------
Analyst.d:
import socket.io;

class Analyst
{
public:
    Event!(void delegate()) Exit;
    this()
{
            this.Exit();
        }}
--------------
event.d:
module std.event;

struct Event(OPTS...)
{
    import std.functional ;
    import std.traits ;

alias DelegateType = OPTS;
    void opOpAssign(string op )(DelegateType )
    {
    }
static void rethrowExceptionHandler(DelegateType , Exception ) { }
    auto opCall(ParameterTypeTuple!DelegateType , void delegate(DelegateType,
Exception) = toDelegate(&rethrowExceptionHandler))
    {
    }
}
--------------
io.d: (not originally included in the dustmite process, running it again with
this included now, will update this issue when that finishes.)
module socket.io;

import std.event : Event;
--------------


Yes, I know I'm triggering a different bug by doing that selective import of
Event, but this appears to be a different issue.

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Jan 16 2014
next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11937






 I wish I could think of a shorter name for this, but oh well. This is an issue
 caused by one of the PRs merged within the last 24 hours. After reducing my
 codebase with dustmite, this is what I get:
 
 --------------
 Analyst.d:
 import socket.io;
 
 class Analyst
 {
 public:
     Event!(void delegate()) Exit;
     this()
 {
             this.Exit();
         }}
 --------------
 event.d:
 module std.event;
 
 struct Event(OPTS...)
 {
     import std.functional ;
     import std.traits ;
 
 alias DelegateType = OPTS;
     void opOpAssign(string op )(DelegateType )
     {
     }
 static void rethrowExceptionHandler(DelegateType , Exception ) { }
     auto opCall(ParameterTypeTuple!DelegateType , void delegate(DelegateType,
 Exception) = toDelegate(&rethrowExceptionHandler))
     {
     }
 }
 --------------
 io.d: (not originally included in the dustmite process, running it again with
 this included now, will update this issue when that finishes.)
 module socket.io;
 
 import std.event : Event;
 --------------
 
 
 Yes, I know I'm triggering a different bug by doing that selective import of
 Event, but this appears to be a different issue.


Alright, finished reducing with io.d included, and the results are the same.
The key to this however is that io.d must be only an include, it cannot be a
source file of the build.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11937




Is this link-failure issue?
This report is not sufficient to reproduce errors. Please also post:

- Directory tree
- Command line
- Caused error messages

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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 Is this link-failure issue?
 This report is not sufficient to reproduce errors. Please also post:
 
 - Directory tree
 - Command line
 - Caused error messages


Well darn, I was afraid of that, alright, give me a bit to get a small version
of the command line together, as it's currently just a little large. (it's a
little over 2k characters as I passed it to dustmite, and I need to reduce the
400 line file that is io.d) And now that I re-read my report again, you are
correct, I failed completely at saying what the actual issue is, woops. Yes,
this is a link-failure issue, as it's unable to resolve the symbol for
rethrowExceptionHandler in event.d. 

Also, as I did a bit more investigating, it appears that the issue was likely
caused in the merge of the 2.065 branch into master, as there are no other
commits that changed anything that should have had any relation to template
instantiation, however that commit shows no changes, so I have no idea how
that's actually possible. This commit is the one I am currently using that
builds
(https://github.com/D-Programming-Language/dmd/commit/df5b5365fbccb9c571ccce7cc43232e4f49b646c),
I haven't done more investigation to see which commit actually caused the
issue.

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Jan 17 2014
prev sibling next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11937


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |INVALID



22:13:18 PST ---
I'm going to mark this as invalid while awaiting a clear description of the
problem. Also, does this happen with HEAD? Link failures with template
instantiations can often be mitigated by using the -allinst switch to dmd.

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Jan 24 2014
prev sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11937




Recently merged my PR might have changed the status.

https://github.com/D-Programming-Language/dmd/pull/3103

I had intended also to implement more strict propagation of "template
instantiation scope" in the PR. If you have interest, you can test the change
with git-head dmd.

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