[Issue 7861] New: Segfault during __error propagation with self-referencing module

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7861

           Summary: Segfault during __error propagation with
                    self-referencing module
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: code at klickverbot.at


--- Comment #0 from klickverbot <code at klickverbot.at> 2012-04-08 14:32:43 PDT ---
Another segfault-on-invalid bug:

---
module test;

mixin template A() {
import test;
}

struct B {
mixin A!();
}

enum C = B.nonexistent;
---

Produces (DMD e0cdcac):
---
(gdb) r 
Starting program: /usr/local/bin/dmd a.reduced/test.d
a.reduced/test.d(11): Error: no property 'nonexistent' for type 'B'

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000000
0x000000010013ae0b in ExpInitializer::semantic (this=0x10051def0,
sc=0x100580240, t=0x0, needInterpret=4) at init.c:827
827        Type *tb = t->toBasetype();
(gdb) bt
#0  0x000000010013ae0b in ExpInitializer::semantic (this=0x10051def0,
sc=0x100580240, t=0x0, needInterpret=4) at init.c:827
#1  0x000000010008ecc7 in VarDeclaration::semantic2 (this=0x10051df10,
sc=0x100580240) at declaration.c:1596
#2  0x0000000100155445 in Module::semantic2 (this=0x10051d270) at module.c:847
#3  0x000000010013879b in Import::semantic2 (this=0x10057fad0, sc=0x10057ffb0)
at import.c:326
#4  0x00000001001d578f in TemplateMixin::semantic2 (this=0x10051dc80,
sc=0x10057ffb0) at template.c:6170
#5  0x00000001001d55fe in TemplateMixin::semantic (this=0x10051dc80,
sc=0x10057f200) at template.c:6125
#6  0x00000001001cfb09 in StructDeclaration::semantic (this=0x10051d9b0,
sc=0x10051e1e0) at struct.c:470
#7  0x00000001001555b7 in Module::semantic (this=0x10051d270) at module.c:806
#8  0x0000000100152cf9 in tryMain (argc=5, argv=0x100514190) at mars.c:1287
#9  0x0000000100153787 in main (argc=2, argv=0x7fff5fbffb48) at mars.c:1476
---

This time it's not really a regression – DMD 2.058 crashed at a different
location.

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