Addition of LogExpFunctions generates lots of warnings.

[jd-lara]

The addition of LogExpFunctions to ForwardDiff is creating a lot of methods overwrite warnings when ForwardDiff is used as a dependency with other packages coming from StatsFuns and IrrationalConstants. x-ref: JuliaStats/StatsFuns.jl#121

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:sqrt3}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:sqrtπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:quartπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:twoπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:sqrthalfπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:sqrt2}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:inv2π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:invsqrt2π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:twoinvπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:fourinvπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:sqrt2π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:log4π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:fourπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:logπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:invπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:halfπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:logtwo}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:log2π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:invsqrt2}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:sqrt4π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:loghalf}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition Type##kw(Any, Type{Base.MPFR.BigFloat}, Base.Irrational{:inv4π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:sqrt3}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:sqrtπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:twoπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:quartπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:sqrthalfπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:sqrt2}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:inv2π}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:invsqrt2π}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:twoinvπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:fourinvπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:sqrt2π}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:fourπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:logπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:invπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:halfπ}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:logtwo}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:log2π}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:log4π}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:invsqrt2}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:sqrt4π}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:loghalf}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float32})(Base.Irrational{:inv4π}) in module IrrationalConstants at irrationals.jl:190 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:sqrt3}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:sqrtπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:quartπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:twoπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:sqrthalfπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:sqrt2}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:inv2π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:invsqrt2π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:twoinvπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:fourinvπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:sqrt2π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:log4π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:fourπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:logπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:invπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:halfπ}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:logtwo}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:log2π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:invsqrt2}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:sqrt4π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:loghalf}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Base.MPFR.BigFloat})(Base.Irrational{:inv4π}) in module IrrationalConstants at irrationals.jl:180 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:sqrt3}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:sqrtπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:twoπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:quartπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:sqrthalfπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:sqrt2}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:inv2π}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:invsqrt2π}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:fourinvπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:twoinvπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:sqrt2π}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:fourπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:logπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:invπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:halfπ}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:logtwo}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:log2π}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:log4π}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:invsqrt2}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:sqrt4π}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:loghalf}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition (::Type{Float64})(Base.Irrational{:inv4π}) in module IrrationalConstants at irrationals.jl:189 overwritten in module StatsFuns on the same line (check for duplicate calls to `include`).
  ** incremental compilation may be fatally broken for this module **

[torfjelde]

This is addressed in JuliaDiff/DiffRules.jl#55

[KristofferC]

ForwardDiff doesn't directly depend on LogExpFunctions so this seems like it has to be solved upstream.