julia> @code_warntype logbeta(0.2, 0.3)
Variables
#self#::Core.Const(SpecialFunctions.logbeta)
a::Float64
b::Float64
@_4::Int64
sign::Union{Int32, Int64}
lab::Union{Float64, Int32, Int64}
Body::Union{Float64, Int32, Int64}
1 ─ %1 = SpecialFunctions.logabsbeta(a, b)::Tuple{Union{Float64, Int32, Int64}, Union{Int32, Int64}}
│ %2 = Base.indexed_iterate(%1, 1)::Core.PartialStruct(Tuple{Union{Float64, Int32, Int64}, Int64}, Any[Union{Float64, Int32, Int64}, Core.Const(2)])
│ (lab = Core.getfield(%2, 1))
│ (@_4 = Core.getfield(%2, 2))
│ %5 = Base.indexed_iterate(%1, 2, @_4::Core.Const(2))::Core.PartialStruct(Tuple{Union{Int32, Int64}, Int64}, Any[Union{Int32, Int64}, Core.Const(3)])
│ (sign = Core.getfield(%5, 1))
│ %7 = (sign < 0)::Bool
└── goto #3 if not %7
2 ─ %9 = Core.tuple(a, b)::Tuple{Float64, Float64}
│ %10 = SpecialFunctions.DomainError(%9, "`beta(a, b)` must be non-negative")::Any
└── SpecialFunctions.throw(%10)
3 ┄ return lab
