Crash when using CBinding.jl

[MLackner]

When using CBinding.jl (or a package depending on it) the language server crashes when it tries to cache this package.

Steps to reproduce:

(test) pkg> add CBinding

(evenually restart the language server or activate the current environment)

The trace gives this message:

"[ Info: Will cache package CBinding (d43a6710-96b8-4a2d-833c-c424785e5374)
ERROR: LoadError: Failure to obtain a bits-type
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:33
  [2] bitstype(#unused#::Type{CBinding.libclang.var"c\"struct CXVirtualFileOverlayImpl\""})
    @ CBinding ~/.julia/packages/CBinding/U3ykW/src/CBinding.jl:93
  [3] fields(#unused#::Type{CBinding.libclang.var"c\"struct CXVirtualFileOverlayImpl\""})
    @ CBinding ~/.julia/packages/CBinding/U3ykW/src/CBinding.jl:99
  [4] fieldnames(#unused#::Type{CBinding.libclang.var"c\"struct CXVirtualFileOverlayImpl\""})
    @ CBinding ~/.julia/packages/CBinding/U3ykW/src/aggregates.jl:34
  [5] fieldcount(#unused#::Type{CBinding.libclang.var"c\"struct CXVirtualFileOverlayImpl\""})
    @ CBinding ~/.julia/packages/CBinding/U3ykW/src/aggregates.jl:32
  [6] fieldcount(#unused#::Type{CBinding.Cptr{CBinding.libclang.var"c\"struct CXVirtualFileOverlayImpl\""}})
    @ CBinding ~/.julia/packages/CBinding/U3ykW/src/pointers.jl:64
  [7] Main.SymbolServer.DataTypeStore(t::Any, parent_mod::Module, exported::Bool)
    @ Main.SymbolServer ~/.vscode/extensions/julialang.language-julia-1.2.8/scripts/packages/SymbolServer/src/symbols.jl:71
  [8] symbols(env::Dict{Symbol, Main.SymbolServer.ModuleStore}, m::Module, allnames::Base.IdSet{Symbol}, visited::Base.IdSet{Module}; get_return_type::Bool)
    @ Main.SymbolServer ~/.vscode/extensions/julialang.language-julia-1.2.8/scripts/packages/SymbolServer/src/symbols.jl:414
  [9] symbols(env::Dict{Symbol, Main.SymbolServer.ModuleStore}, m::Nothing, allnames::Base.IdSet{Symbol}, visited::Base.IdSet{Module}; get_return_type::Bool)
    @ Main.SymbolServer ~/.vscode/extensions/julialang.language-julia-1.2.8/scripts/packages/SymbolServer/src/symbols.jl:463
 [10] symbols(env::Dict{Symbol, Main.SymbolServer.ModuleStore}, m::Nothing, allnames::Base.IdSet{Symbol}, visited::Base.IdSet{Module})
    @ Main.SymbolServer ~/.vscode/extensions/julialang.language-julia-1.2.8/scripts/packages/SymbolServer/src/symbols.jl:404
 [11] top-level scope
    @ ~/.vscode/extensions/julialang.language-julia-1.2.8/scripts/packages/SymbolServer/src/server.jl:108
in expression starting at /Users/lackner/.vscode/extensions/julialang.language-julia-1.2.8/scripts/packages/SymbolServer/src/server.jl:1
",
"command": "symserv_crash"