http://d.puremagic.com/issues/show_bug.cgi?id=5950

           Summary: Linker problem with AA.get()
           Product: D
           Version: unspecified
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2011-05-07 16:12:45 PDT ---
This D2 code:


import std.stdio;
void main() {
    string[char] tab = ['e': "red", 'b': "blue"];
    string r;
    foreach (c; "aba") {
        // if (c in tab) r ~= tab[c]; // OK
        r ~= tab.get(c, ""); // ERR
    }
    writeln(r);
}


Gives me a linker error (DMD 2.053beta):

test.obj(test)
Error 42: Symbol Undefined
_D6object28__T16AssociativeArrayTaTAyaZ16AssociativeArray3getMFaLAyaZAya

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kennytm@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kennytm@gmail.com
         OS/Version|Windows                     |All


--- Comment #1 from kennytm@gmail.com 2011-05-08 00:19:05 PDT ---
Reproducible on Mac OS X. The missing symbol demangled is

immutable(char)[] object.AssociativeArray!(char,
immutable(char)[]).AssociativeArray.get(char, lazy immutable(char)[])

It is probably a regression since I can't reproduce it on ideone which uses 2.042, but it may simply be that the error doesn't manifest on Linux.

Reduced test case:
--------------------------
import std.stdio;   // <-- the import is necessary to trigger the bug!
void main() {
    string[char] tab;   // <-- must be a string[char]?
    tab.get('c', "");
}
--------------------------
Undefined symbols:
  "_D6object28__T16AssociativeArrayTaTAyaZ16AssociativeArray3getMFaLAyaZAya",
referenced from:
      __Dmain in x.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
--- errorlevel 1
--------------------------

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Rainer Schuetze <r.sagitario@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |r.sagitario@gmx.de


--- Comment #2 from Rainer Schuetze <r.sagitario@gmx.de> 2011-06-18 09:31:05 PDT ---
This seems to happen when there is an identical associative array declared in an imported file, but that is not used to generate code from. Obviously dmd believes it does not need to generate the template code again. Here's a reduced test case:

-----
module test1;
int[string] map;

-----
module test2;
import test1;

int main()
{
    int[string] m;
    return m.keys.length;
}
-----

compiling this with "dmd test2.d" with the latest compiler from github yields

OPTLINK (R) for Win32  Release 8.00.11
Copyright (C) Digital Mars 1989-2010  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
test2.obj(test2)
 Error 42: Symbol Undefined
_D6object28__T16AssociativeArrayTAyaTiZ16Associative
Array4keysMFNdZAAya
--- errorlevel 1

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