Weird LDC error on mac

[Bogdan]

I managed to get a stack trace from my error:


```
core.exception.AssertError@/Users/gedaiu/workspace/ldc/dmd/parsetimevisitor.d(20): Assertion failure
----------------
/tmp/ldc-20241231-7715-mkgqdh/ldc-1.40.0-src/runtime/druntime/src/core/exception.d:569 onAssertError [0x10083ccf3]
/tmp/ldc-20241231-7715-mkgqdh/ldc-1.40.0-src/runtime/druntime/src/core/exception.d:808 _d_assert [0x100899bf7]
/Users/gedaiu/workspace/ldc/dmd/parsetimevisitor.d:20 
ParseTimeVisitor<ASTCodegen>::visit(Parameter*) [0x10001397f]
/Users/gedaiu/workspace/ldc/dmd/mtype.d:4354 
Parameter::accept(Visitor*) [0x10003fd7f]
/Users/gedaiu/workspace/ldc/dmd/expressionsem.d:14145 
dmd.expression.Expression 
dmd.expressionsem.expressionSemantic(dmd.expression.Expression, 
dmd.dscope.Scope*) [0x10003c5ff]
/Users/gedaiu/workspace/ldc/dmd/expressionsem.d:758 bool 
dmd.expressionsem.arrayExpressionSemantic(dmd.expression.Expression[], dmd.dscope.Scope*, bool) [0x1001e512b]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1938 
DsymbolSemanticVisitor::visit(UserAttributeDeclaration*) 
[0x100009a1b]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:138 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(UserAttributeDeclaration*) [0x10000997b]
/Users/gedaiu/workspace/ldc/dmd/attrib.d:1151 
UserAttributeDeclaration::accept(Visitor*) [0x100324c17]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:3612 void 
dmd.dsymbolsem.DsymbolSemanticVisitor.visit(dmd.dclass.ClassDeclaration).__lambda_L3612_C39!(dmd.dsymbol.Dsymbol).__lambda_L3612_C39(dmd.dsymbol.Dsymbol) [0x1002722b3]
/Users/gedaiu/workspace/ldc/dmd/dsymbol.d:111 void 
dmd.dsymbol.foreachDsymbol(dmd.root.array.Array!(dmd.dsymbol.Dsymbol).Array*, void delegate(dmd.dsymbol.Dsymbol)) [0x100065773]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:3612 
DsymbolSemanticVisitor::visit(ClassDeclaration*) [0x10001123b]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:192 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(ClassDeclaration*) [0x10000edff]
/Users/gedaiu/workspace/ldc/dmd/dclass.d:958 
ClassDeclaration::accept(Visitor*) [0x100042c47]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1987 void 
dmd.dsymbolsem.DsymbolSemanticVisitor.visit(dmd.dmodule.Module).__lambda_L1984_C35!(dmd.dsymbol.Dsymbol).__lambda_L1984_C35(dmd.dsymbol.Dsymbol) [0x10026bdfb]
/Users/gedaiu/workspace/ldc/dmd/dsymbol.d:111 void 
dmd.dsymbol.foreachDsymbol(dmd.root.array.Array!(dmd.dsymbol.Dsymbol).Array*, void delegate(dmd.dsymbol.Dsymbol)) [0x100065773]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1984 
DsymbolSemanticVisitor::visit(Module*) [0x10000a013]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:154 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Module*) 
[0x100009e03]
/Users/gedaiu/workspace/ldc/dmd/dmodule.d:1245 
Module::accept(Visitor*) [0x100199d1b]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1625 
DsymbolSemanticVisitor::visit(Import*) [0x1000084f3]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:115 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Import*) 
[0x100007cf3]
/Users/gedaiu/workspace/ldc/dmd/dimport.d:181 
Import::accept(Visitor*) [0x1002d16bf]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1987 void 
dmd.dsymbolsem.DsymbolSemanticVisitor.visit(dmd.dmodule.Module).__lambda_L1984_C35!(dmd.dsymbol.Dsymbol).__lambda_L1984_C35(dmd.dsymbol.Dsymbol) [0x10026bdfb]
/Users/gedaiu/workspace/ldc/dmd/dsymbol.d:111 void 
dmd.dsymbol.foreachDsymbol(dmd.root.array.Array!(dmd.dsymbol.Dsymbol).Array*, void delegate(dmd.dsymbol.Dsymbol)) [0x100065773]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1984 
DsymbolSemanticVisitor::visit(Module*) [0x10000a013]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:154 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Module*) 
[0x100009e03]
/Users/gedaiu/workspace/ldc/dmd/dmodule.d:1245 
Module::accept(Visitor*) [0x100199d1b]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1625 
DsymbolSemanticVisitor::visit(Import*) [0x1000084f3]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:115 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Import*) 
[0x100007cf3]
/Users/gedaiu/workspace/ldc/dmd/dimport.d:181 
Import::accept(Visitor*) [0x1002d16bf]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1987 void 
dmd.dsymbolsem.DsymbolSemanticVisitor.visit(dmd.dmodule.Module).__lambda_L1984_C35!(dmd.dsymbol.Dsymbol).__lambda_L1984_C35(dmd.dsymbol.Dsymbol) [0x10026bdfb]
/Users/gedaiu/workspace/ldc/dmd/dsymbol.d:111 void 
dmd.dsymbol.foreachDsymbol(dmd.root.array.Array!(dmd.dsymbol.Dsymbol).Array*, void delegate(dmd.dsymbol.Dsymbol)) [0x100065773]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1984 
DsymbolSemanticVisitor::visit(Module*) [0x10000a013]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:154 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Module*) 
[0x100009e03]
/Users/gedaiu/workspace/ldc/dmd/dmodule.d:1245 
Module::accept(Visitor*) [0x100199d1b]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1625 
DsymbolSemanticVisitor::visit(Import*) [0x1000084f3]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:115 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Import*) 
[0x100007cf3]
/Users/gedaiu/workspace/ldc/dmd/dimport.d:181 
Import::accept(Visitor*) [0x1002d16bf]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1987 void 
dmd.dsymbolsem.DsymbolSemanticVisitor.visit(dmd.dmodule.Module).__lambda_L1984_C35!(dmd.dsymbol.Dsymbol).__lambda_L1984_C35(dmd.dsymbol.Dsymbol) [0x10026bdfb]
/Users/gedaiu/workspace/ldc/dmd/dsymbol.d:111 void 
dmd.dsymbol.foreachDsymbol(dmd.root.array.Array!(dmd.dsymbol.Dsymbol).Array*, void delegate(dmd.dsymbol.Dsymbol)) [0x100065773]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1984 
DsymbolSemanticVisitor::visit(Module*) [0x10000a013]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:154 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Module*) 
[0x100009e03]
/Users/gedaiu/workspace/ldc/dmd/dmodule.d:1245 
Module::accept(Visitor*) [0x100199d1b]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1625 
DsymbolSemanticVisitor::visit(Import*) [0x1000084f3]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:115 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Import*) 
[0x100007cf3]
/Users/gedaiu/workspace/ldc/dmd/dimport.d:181 
Import::accept(Visitor*) [0x1002d16bf]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1987 void 
dmd.dsymbolsem.DsymbolSemanticVisitor.visit(dmd.dmodule.Module).__lambda_L1984_C35!(dmd.dsymbol.Dsymbol).__lambda_L1984_C35(dmd.dsymbol.Dsymbol) [0x10026bdfb]
/Users/gedaiu/workspace/ldc/dmd/dsymbol.d:111 void 
dmd.dsymbol.foreachDsymbol(dmd.root.array.Array!(dmd.dsymbol.Dsymbol).Array*, void delegate(dmd.dsymbol.Dsymbol)) [0x100065773]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:1984 
DsymbolSemanticVisitor::visit(Module*) [0x10000a013]
/Users/gedaiu/workspace/ldc/driver/timetrace_sema.d:154 
SemanticTimeTraceVisitor<DsymbolSemanticVisitor*>::visit(Module*) 
[0x100009e03]
/Users/gedaiu/workspace/ldc/dmd/dmodule.d:1245 
Module::accept(Visitor*) [0x100199d1b]
/Users/gedaiu/workspace/ldc/dmd/dsymbolsem.d:96 void 
dmd.dsymbolsem.dsymbolSemantic(dmd.dsymbol.Dsymbol, 
dmd.dscope.Scope*) [0x10004bae7]
/Users/gedaiu/workspace/ldc/dmd/main.d:643 mars_tryMain(Param&, 
Array<char const*>&) [0x1001800e3]
/Users/gedaiu/workspace/ldc/driver/main.cpp:1232 cppmain() 
[0x10062d547]
/Users/gedaiu/workspace/ldc/driver/main.d:27 _Dmain [0x1000248b7]
Process 91478 exited with status = 1 (0x00000001) ```

it looks like i hit an `assert(0)`:
```
     void visit(AST.Parameter) { assert(0); }
```