julia> descend(BigInt, (), optimize=true, annotate_source=false)
BigInt(; nbits) @ Base.GMP gmp.jl:63
∘ ─ %0 = invoke BigInt()::BigInt
    @ gmp.jl:63 within `BigInt`
1 ─ %1 = invoke $(QuoteNode(Base.GMP.var"#_#1#2"()))(0::Int64, #ctor-self#::Type{BigInt})::BigInt
└──      return %1
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 • %1 = < constprop > _#1(::Core.Const(0),::Core.Const(BigInt))::BigInt
   ↩
argextype called on Expr with head :call which is not valid for IR in argument-position.
ERROR: AssertionError: false
Stacktrace:
  [1] argextype(x::Any, src::Core.Compiler.IRCode, sptypes::Vector{Core.Compiler.VarState}, slottypes::Vector{Any})
    @ Core.Compiler ./compiler/optimize.jl:368
  [2] #11
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/reflection.jl:53 [inlined]
  [3] map!(f::Cthulhu.var"#11#12"{Core.Compiler.IRCode, Vector{Any}, Vector{Core.Compiler.VarState}}, dest::Vector{Any}, A::Vector{Any})
    @ Base ./abstractarray.jl:3300
  [4] mapany(f::Function, A::Vector{Any})
    @ Base ./abstractarray.jl:3309
  [5] find_callsites(interp::Cthulhu.CthulhuInterpreter, CI::Core.Compiler.IRCode, stmt_infos::Vector{Core.Compiler.CallInfo}, mi::Core.MethodInstance, slottypes::Vector{Any}, optimize::Bool, annotate_source::Bool)
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/reflection.jl:52
  [6] 
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/Cthulhu.jl:468
  [7] 
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/Cthulhu.jl:610
  [8] _descend(term::REPL.Terminals.TTYTerminal, interp::Cthulhu.CthulhuInterpreter, mi::Core.MethodInstance; kwargs::@Kwargs{iswarn::Bool, optimize::Bool, annotate_source::Bool})
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/Cthulhu.jl:756
  [9] _descend(term::REPL.Terminals.TTYTerminal, args::Any; interp::Core.Compiler.NativeInterpreter, kwargs::@Kwargs{iswarn::Bool, optimize::Bool, annotate_source::Bool})
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/Cthulhu.jl:772
 [10] __descend_with_error_handling(args::Any; terminal::Any, kwargs...)
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/Cthulhu.jl:213
 [11] _descend_with_error_handling(f::Any, argtypes::Any; kwargs::@Kwargs{iswarn::Bool, optimize::Bool, annotate_source::Bool})
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/Cthulhu.jl:202
 [12] descend_code_typed(::Any, ::Vararg{Any}; kwargs::@Kwargs{optimize::Bool, annotate_source::Bool})
    @ Cthulhu ~/.julia/packages/Cthulhu/Ndnbu/src/Cthulhu.jl:160
 [13] top-level scope
    @ REPL[4]:1
Some type information was truncated. Use `show(err)` to see complete types.