Update runtests.jl

Author: KristofferC

test/runtests.jl

@@ -11,13 +11,6 @@ if Sys.ARCH === :x86_64 || Sys.ARCH === :i686
     doctest(FixedPointNumbers, manual = false)
 end
 
-# Compat for Julia 1.7
-if !isdefined(Base, :checked_length)
-    const checked_length = Base.unsafe_length
-else
-    using Base: checked_length
-end
-
 @testset "normed" begin
     include("normed.jl")
 end