Crash when build with DMD 2.085

[ghost]

For example if you try to get the DDOC for the ASTVisitor symbol of dparse:

Program received signal SIGSEGV, Segmentation fault.
0x000000000073cfb7 in _D7dsymbol6scope_5Scope16getSymbolsByNameMNgFSQBs16string_interning14InternedStringZAPNgSQDj6symbol7DSymbol (this=..., 
    name=-4294967295, __name_8=-4294967295) at ../../../../.dub/packages/emsi_containers-0.8.0-alpha.11/emsi_containers/src/containers/ttree.d:243
243                     return Range!(This)(cast(const(Node)*) root, RangeType.equal, value);
Missing separate debuginfos, use: dnf debuginfo-install libgcc-8.2.1-6.fc28.x86_64
(gdb) 
(gdb) bt
#0  0x000000000073cfb7 in _D7dsymbol6scope_5Scope16getSymbolsByNameMNgFSQBs16string_interning14InternedStringZAPNgSQDj6symbol7DSymbol (this=..., 
    name=-4294967295, __name_8=-4294967295) at ../../../../.dub/packages/emsi_containers-0.8.0-alpha.11/emsi_containers/src/containers/ttree.d:243
#1  0x000000000076de4e in dsymbol.conversion.first.FirstPass.visit(const(dparse.ast.ImportDeclaration)) (this=0x7fffffffcc00, importDeclaration=0xc87068)
    at ../../../../.dub/packages/dsymbol-0.6.2/dsymbol/src/dsymbol/conversion/first.d:463
#2  0x00000000007975ad in _D6dparse3ast11Declaration6acceptMxFCQBjQBf10ASTVisitorZv (this=..., visitor=0x7fffffffcc58)
    at ../../../../.dub/packages/libdparse-0.11.4/libdparse/src/dparse/ast.d:1252
#3  0x000000000076c678 in dsymbol.conversion.first.FirstPass.visit(const(dparse.ast.Declaration)) (this=..., dec=0xc87010)
    at ../../../../.dub/packages/dsymbol-0.6.2/dsymbol/src/dsymbol/conversion/first.d:335
#4  0x000000000076c929 in dsymbol.conversion.first.FirstPass.visit(const(dparse.ast.Module)) (this=0x0, mod=0xc87010)
    at ../../../../.dub/packages/libdparse-0.11.4/libdparse/src/dparse/ast.d-mixin-2204:2206
#5  0x0000000000735ece in _D7dsymbol10conversion25generateAutocompleteTreesFAxS3std12experimental5lexer__T14TokenStructureThVAyaa305_0a20202020737472696e6720636f6d6d656e743b0a20202020737472696e6720747261696c696e67436f6d6d656e743b0a0a20202020696e74206f70436d702873697a655f7420692920636f6e73742070757265206e6f7468726---Type <return> to continue, or q <return> to quit---
f77204073616665207b0a202020202020202069662028696e646578203c2069292072657475726e202d313b0a202020202020202069662028696e646578203e2069292072657475726e20313b0a202020202020202072657475726e20303b0a202020207d0a0a20202020696e74206f70436d702872656620636f6e737420747970656f66287468697329206f746865722920636f6e73742070757265206e6f7468726f77204073616665207b0a202020202020202072657475726e206f70436d70286f746865722e696e646578293b0a202020207d0aZQYoC4stdx9allocator10IAllocatorPS6dparse18rollback_allocator17RollbackAllocatormKSQBEs11modulecache11ModuleCacheZSQBFyQBFu15ScopeSymbolPair (cache=..., cursorPosition=2621, 
    parseAllocator=0x7fffffffce00, symbolAllocator=0x7fffffffd000, tokens=...)
    at ../../../../.dub/packages/dsymbol-0.6.2/dsymbol/src/dsymbol/conversion/first.d:91
#6  0x00000000006f6e8d in _D3dcd6server12autocomplete3doc6getDocFxSQBn6common8messages19AutocompleteRequestKS7dsymbol11modulecache11ModuleCacheZSQEnQDaQCw20AutocompleteResponse (response=0x7fffffffd130, moduleCache=..., request=...) at src/dcd/server/autocomplete/util.d:144
#7  0x0000000000705e9a in _D3dcd6server4main9runServerFAAyaZ13__dgliteral30MFNaNiNfZSQCf6common8messages20AutocompleteResponse (__capture=0x7fffffffd130, 
    __HID88=0x7fffffffd130) at src/dcd/server/main.d:292
#8  0x0000000000706015 in _D3dcd6server4main15trySendResponseFC3std6socket6SocketLSQCd6common8messages20AutocompleteResponseLAyaZv (
    msg=135846693299373334910196368, response=..., 
    __response_8=0x705e60 <_D3dcd6server4main9runServerFAAyaZ13__dgliteral30MFNaNiNfZSQCf6common8messages20AutocompleteResponse>, 
    socket=0xc08a01 <initializer for TypeInfo_PyS3std8datetime8timezone13PosixTimeZone6TTInfo+1>) at src/dcd/server/main.d:321
#9  0x0000000000705796 in dcd.server.main.runServer(immutable(char)[][]) (args=...) at src/dcd/server/main.d:292
#10 0x00000000007045f8 in D main (args=...) at src/dcd/server/main.d:50

[ghost]

That's a DMD regression between 2.084.1 and 2.085

[ghost]

caused by the recent work on GSROA, this commit from this PR, so closing.