[Issue 7812] New: Segfault on invalid code during template match deduction with errors gagged

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7812

           Summary: Segfault on invalid code during template match
                    deduction with errors gagged
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: code at klickverbot.at


--- Comment #0 from klickverbot <code at klickverbot.at> 2012-04-02 09:38:24 PDT ---
The following snippet compiles fine using 2.058, but segfaults with latest Git
master (c2824d43):

---
template A(T...) {
}

template B(alias C) if (C) {
}

template D() {
  alias B!(A!(NonExistent!())) D;
}

static assert(!__traits(compiles, D!()));
---

---
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
0x000cf64d in DsymbolExp::semantic (this=0x4631e0, sc=0x462c30) at
expression.c:2920
2920            s = ti->inst->toAlias();
(gdb) bt
#0  0x000cf64d in DsymbolExp::semantic (this=0x4631e0, sc=0x462c30) at
expression.c:2920
#1  0x000cde68 in IdentifierExp::semantic (this=0x4631c0, sc=0x462c30) at
expression.c:2635
#2  0x001c43c9 in TemplateDeclaration::matchWithInstance (this=0x426ab0,
ti=0x462010, dedtypes=0xbfffec88, fargs=0x0, flag=0) at template.c:790
#3  0x001d1208 in TemplateInstance::findBestMatch (this=0x462010, sc=0x461d50,
fargs=0x0) at template.c:5152
#4  0x001c88f1 in TemplateInstance::semantic (this=0x462010, sc=0x461d50,
fargs=0x0) at template.c:4468
#5  0x001d07a4 in TemplateInstance::semantic (this=0x462010, sc=0x461d50) at
template.c:4321
#6  0x00166845 in TypeInstance::resolve (this=0x461fb0, loc={filename =
0x426710 "test.d", linnum= 8}, sc=0x461d50, pe=0xbfffef18, pt=0xbfffef1c,
ps=0xbfffef14) at mtype.c:6690
#7  0x00166bcc in TypeInstance::toDsymbol (this=0x461fb0, sc=0x461d50) at
mtype.c:6745
#8  0x00092118 in AliasDeclaration::semantic (this=0x461f50, sc=0x461d50) at
declaration.c:461
#9  0x001d086a in TemplateInstance::expandMembers (this=0x4271a0, sc2=0x461d50)
at template.c:4338
#10 0x001d090e in TemplateInstance::tryExpandMembers (this=0x4271a0,
sc2=0x461d50) at template.c:4374
#11 0x001c9265 in TemplateInstance::semantic (this=0x4271a0, sc=0x461bb0,
fargs=0x0) at template.c:4736
#12 0x001d07a4 in TemplateInstance::semantic (this=0x4271a0, sc=0x461bb0) at
template.c:4321
#13 0x00166845 in TypeInstance::resolve (this=0x427250, loc={filename =
0x426710 "test.d", linnum = 11}, sc=0x461bb0, pe=0xbffff44c, pt=0xbffff43c,
ps=0xbffff438) at mtype.c:6690
#14 0x00214d1f in TraitsExp::semantic (this=0x4272b0, sc=0x461bb0) at
traits.c:462
#15 0x000db61d in UnaExp::semantic (this=0x4272d0, sc=0x461bb0) at
expression.c:5828
#16 0x000e85c3 in NotExp::semantic (this=0x4272d0, sc=0x461bb0) at
expression.c:8503
#17 0x001e5af7 in StaticAssert::semantic2 (this=0x4272f0, sc=0x461bb0) at
staticassert.c:59
#18 0x0014e187 in Module::semantic2 (this=0x4265f0) at module.c:840
#19 0x0014a553 in tryMain (argc=5, argv=0x41fea0) at mars.c:1301
#20 0x0014b282 in main (argc=2, argv=0xbffffbd8) at mars.c:1476
---

This has likely been uncovered by the change from issue 7481.

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