[Issue 19031] [REG 2.080.0] assert failure when subclassing C++ class with D class

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19031

--- Comment #1 from Jacob Carlborg <doob at me.com> ---
Forgot to mention, this gave an compile error compiling with DMD 2.079.0 but
fails with  2.080.0 and up to master, currently at
033d324957ff5bee8e25c7335eab2c562d17e2b1. The assertion failure is:

DMD v2.081.0-beta.2-70-g033d32495 DEBUG
---
ERROR: This is a compiler bug.
Please report it via https://issues.dlang.org/enter_bug.cgi
with, preferably, a reduced, reproducible example and the information below.
DustMite (https://github.com/CyberShadow/DustMite/wiki) can help with the
reduction.
---
DMD v2.081.0-beta.2-70-g033d32495
predefs   NoBackend DigitalMars Posix OSX darwin LittleEndian D_Version2 all
D_SIMD D_InlineAsm_X86_64 X86_64 D_LP64 D_PIC assert D_HardFloat
D_ObjectiveCbinary    ./generated/osx/release/64/dmd
version   v2.081.0-beta.2-70-g033d32495
config    ./generated/osx/release/64/dmd.conf
DFLAGS    -I./generated/osx/release/64/../../../../../druntime/import
-I./generated/osx/release/64/../../../../../phobos
-L-L./generated/osx/release/64/../../../../../phobos/generated/osx/release/64
-fPIC
---
core.exception.AssertError at dmd/dsymbolsem.d(3460): Assertion failure
----------------
4   dmd                                 0x000000010f718cc9 _d_assertp + 117
5   dmd                                 0x000000010f520172
_ZN22DsymbolSemanticVisitor23funcDeclarationSemanticEP15FuncDeclaration + 7950
6   dmd                                 0x000000010f520878
_ZN22DsymbolSemanticVisitor5visitEP15FuncDeclaration + 28
7   dmd                                 0x000000010f574b8d
_ZN15FuncDeclaration6acceptEP7Visitor + 33
8   dmd                                 0x000000010f516c0c
_Z15dsymbolSemanticP7DsymbolP5Scope + 64
9   dmd                                 0x000000010f5243cc
_ZN22DsymbolSemanticVisitor5visitEP16ClassDeclaration + 5864
10  dmd                                 0x000000010f4e3855
_ZN16ClassDeclaration6acceptEP7Visitor + 33
11  dmd                                 0x000000010f516c0c
_Z15dsymbolSemanticP7DsymbolP5Scope + 64
12  dmd                                 0x000000010f51bcf5
_ZN22DsymbolSemanticVisitor5visitEP6Module + 137
13  dmd                                 0x000000010f505f85
_ZN6Module6acceptEP7Visitor + 33
14  dmd                                 0x000000010f516c0c
_Z15dsymbolSemanticP7DsymbolP5Scope + 64
15  dmd                                 0x000000010f5ad44d int
dmd.mars.tryMain(ulong, const(char)**) + 6265
16  dmd                                 0x000000010f4b03b6 _Dmain + 38
17  dmd                                 0x000000010f72bb1b void
rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).runAll().__lambda1() + 39
18  dmd                                 0x000000010f72b9ab void
rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate()) + 31
19  dmd                                 0x000000010f72ba86 void
rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll()
+ 138
20  dmd                                 0x000000010f72b9ab void
rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate()) + 31
21  dmd                                 0x000000010f72b919 _d_run_main + 485
22  dmd                                 0x000000010f4b0429 main + 33
23  libdyld.dylib                       0x00007fff6ac20014 start + 0
24  ???                                 0x0000000000000003 0x0 + 3

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