Update src/little_set.jl

Co-authored-by: Max Horn <max@quendi.de>

src/little_set.jl

@@ -49,7 +49,7 @@ end
 # `FrozenLittleSet{T, Tuple{Vararg{T}}}`), these methods allow accessing data without exposing the
 # underlying `data` field and unintentionally specializing downstream code on the exact type
 # representation of a tuple.
-if isdefined(Base, Symbol("@assume_effects"))
+@static if isdefined(Base, Symbol("@assume_effects"))
     Base.@assume_effects :nothrow function unsafe_getstate(x::FrozenLittleSet, state::Int)
         getfield(getfield(x, :data), state)
     end