[Issue 23904] Spurious "struct [...] already exists"

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23904

--- Comment #1 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
BTW, it compiles in 2.080.1. I did not mark it as a regression because, even
though the release compiler does not produce any errors, the debug build of
that version trips an assertion:

core.exception.AssertError at dmd/dsymbolsem.d(4208): Assertion failure
----------------
dmd() [0x5869ff]
dmd(_ZN22DsymbolSemanticVisitor5visitEP17StructDeclaration+0x8ea) [0x582552]
dmd(_ZN17StructDeclaration6acceptEP7Visitor+0x1d) [0x55d31d]
dmd(_Z15dsymbolSemanticP7DsymbolP5Scope+0x3d) [0x5779d5]
dmd(_ZN16TemplateInstance13expandMembersEP5Scope+0xdd) [0x596735]
dmd(_ZN16TemplateInstance16tryExpandMembersEP5Scope+0x5c) [0x5967a4]
dmd(void
dmd.dsymbolsem.templateInstanceSemantic(dmd.dtemplate.TemplateInstance,
dmd.dscope.Scope*,
dmd.root.array.Array!(dmd.expression.Expression).Array*)+0x8d8) [0x585b50]
dmd(_ZN22DsymbolSemanticVisitor5visitEP16TemplateInstance+0x16) [0x57da96]
dmd(_ZN16TemplateInstance6acceptEP7Visitor+0x1d) [0x596845]
dmd(_Z15dsymbolSemanticP7DsymbolP5Scope+0x3d) [0x5779d5]
dmd(_ZN25ExpressionSemanticVisitor5visitEP8ScopeExp+0x3c6) [0x5af336]
dmd(_ZN8ScopeExp6acceptEP7Visitor+0x1d) [0x5a36fd]
dmd(_Z18expressionSemanticP10ExpressionP5Scope+0x43) [0x5c38fb]
dmd(_ZN25ExpressionSemanticVisitor5visitEP7CallExp+0x49e) [0x5b1cae]
dmd(_ZN7CallExp6acceptEP7Visitor+0x1d) [0x5a6b7d]
dmd(_Z18expressionSemanticP10ExpressionP5Scope+0x43) [0x5c38fb]
dmd(_ZN24StatementSemanticVisitor5visitEP12ExpStatement+0x50) [0x63d278]
dmd(_ZN12ExpStatement6acceptEP7Visitor+0x1d) [0x622d1d]
dmd(_Z17statementSemanticP9StatementP5Scope+0x43) [0x63d19b]
dmd(_ZN24StatementSemanticVisitor5visitEP17CompoundStatement+0xe8) [0x63d518]
dmd(_ZN17CompoundStatement6acceptEP7Visitor+0x1d) [0x62344d]
dmd(_Z17statementSemanticP9StatementP5Scope+0x43) [0x63d19b]
dmd(_ZN16Semantic3Visitor5visitEP15FuncDeclaration+0x1174) [0x6504dc]
dmd(_ZN15FuncDeclaration6acceptEP7Visitor+0x1d) [0x5c9fd5]
dmd(_Z9semantic3P7DsymbolP5Scope+0x3d) [0x64ef7d]
dmd(_ZN16Semantic3Visitor5visitEP16TemplateInstance+0x14f) [0x64f0f7]
dmd(_ZN16TemplateInstance6acceptEP7Visitor+0x1d) [0x596845]
dmd(_Z9semantic3P7DsymbolP5Scope+0x3d) [0x64ef7d]
dmd(_ZN16TemplateInstance12trySemantic3EP5Scope+0x5c) [0x59680c]
dmd(void
dmd.dsymbolsem.templateInstanceSemantic(dmd.dtemplate.TemplateInstance,
dmd.dscope.Scope*,
dmd.root.array.Array!(dmd.expression.Expression).Array*)+0xcc3) [0x585f3b]
dmd(void dmd.dtemplate.functionResolve(dmd.declaration.Match*,
dmd.dsymbol.Dsymbol, dmd.globals.Loc, dmd.dscope.Scope*,
dmd.root.array.Array!(dmd.root.rootobject.RootObject).Array*, dmd.mtype.Type,
dmd.root.array.Array!(dmd.expression.Expression).Array*, const(char)**)+0x148)
[0x58b760]
dmd(_Z15resolveFuncCallRK3LocP5ScopeP7DsymbolP5ArrayIP10RootObjectEP4TypePS6_IP10ExpressionEi+0xd1)
[0x5ca761]
dmd(_ZN25ExpressionSemanticVisitor5visitEP7CallExp+0x2504) [0x5b3d14]
dmd(_ZN7CallExp6acceptEP7Visitor+0x1d) [0x5a6b7d]
dmd(_Z18expressionSemanticP10ExpressionP5Scope+0x43) [0x5c38fb]
dmd(_ZN24StatementSemanticVisitor5visitEP12ExpStatement+0x50) [0x63d278]
dmd(_ZN12ExpStatement6acceptEP7Visitor+0x1d) [0x622d1d]
dmd(_Z17statementSemanticP9StatementP5Scope+0x43) [0x63d19b]
dmd(_ZN24StatementSemanticVisitor5visitEP17CompoundStatement+0xe8) [0x63d518]
dmd(_ZN17CompoundStatement6acceptEP7Visitor+0x1d) [0x62344d]
dmd(_Z17statementSemanticP9StatementP5Scope+0x43) [0x63d19b]
dmd(_ZN16Semantic3Visitor5visitEP15FuncDeclaration+0x1174) [0x6504dc]
dmd(_ZN15FuncDeclaration6acceptEP7Visitor+0x1d) [0x5c9fd5]
dmd(_Z9semantic3P7DsymbolP5Scope+0x3d) [0x64ef7d]
dmd(_ZN16Semantic3Visitor5visitEP16TemplateInstance+0x14f) [0x64f0f7]
dmd(_ZN16TemplateInstance6acceptEP7Visitor+0x1d) [0x596845]
dmd(_Z9semantic3P7DsymbolP5Scope+0x3d) [0x64ef7d]
dmd(_ZN16TemplateInstance12trySemantic3EP5Scope+0x5c) [0x59680c]
dmd(void
dmd.dsymbolsem.templateInstanceSemantic(dmd.dtemplate.TemplateInstance,
dmd.dscope.Scope*,
dmd.root.array.Array!(dmd.expression.Expression).Array*)+0xac9) [0x585d41]
dmd(void dmd.dtemplate.functionResolve(dmd.declaration.Match*,
dmd.dsymbol.Dsymbol, dmd.globals.Loc, dmd.dscope.Scope*,
dmd.root.array.Array!(dmd.root.rootobject.RootObject).Array*, dmd.mtype.Type,
dmd.root.array.Array!(dmd.expression.Expression).Array*, const(char)**)+0x148)
[0x58b760]
dmd(_Z15resolveFuncCallRK3LocP5ScopeP7DsymbolP5ArrayIP10RootObjectEP4TypePS6_IP10ExpressionEi+0xd1)
[0x5ca761]
dmd(_ZN25ExpressionSemanticVisitor5visitEP7CallExp+0x2504) [0x5b3d14]
dmd(_ZN7CallExp6acceptEP7Visitor+0x1d) [0x5a6b7d]
dmd(_Z18expressionSemanticP10ExpressionP5Scope+0x43) [0x5c38fb]
dmd(_ZN24StatementSemanticVisitor5visitEP12ExpStatement+0x50) [0x63d278]
dmd(_ZN12ExpStatement6acceptEP7Visitor+0x1d) [0x622d1d]
dmd(_Z17statementSemanticP9StatementP5Scope+0x43) [0x63d19b]
dmd(_ZN24StatementSemanticVisitor5visitEP17CompoundStatement+0xe8) [0x63d518]
dmd(_ZN17CompoundStatement6acceptEP7Visitor+0x1d) [0x62344d]
dmd(_Z17statementSemanticP9StatementP5Scope+0x43) [0x63d19b]
dmd(_ZN16Semantic3Visitor5visitEP15FuncDeclaration+0x1174) [0x6504dc]
dmd(_ZN15FuncDeclaration6acceptEP7Visitor+0x1d) [0x5c9fd5]
dmd(_Z9semantic3P7DsymbolP5Scope+0x3d) [0x64ef7d]
dmd(_ZN16Semantic3Visitor5visitEP6Module+0x6a) [0x64f31a]
dmd(_ZN6Module6acceptEP7Visitor+0x1d) [0x553055]
dmd(_Z9semantic3P7DsymbolP5Scope+0x3d) [0x64ef7d]
dmd(int dmd.mars.tryMain(ulong, const(char)**)+0x2151) [0x5f1491]
dmd(_Dmain+0x27) [0x5f238f]
dmd(_D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv+0x1f)
[0x73626b]
dmd(void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate())+0x2a) [0x7361c6]
dmd(void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).runAll()+0x2b) [0x736227]
dmd(void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate())+0x2a) [0x7361c6]
dmd(_d_run_main+0x1d2) [0x736146]
dmd(main+0x14) [0x5f6074]

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