Put back `unreachable_floop()`

[codecov[bot]]

Codecov Report

Merging #102 (8e95bf9) into master (dcb4255) will decrease coverage by 0.15%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   95.60%   95.44%   -0.16%     
==========================================
  Files           5        5              
  Lines         614      615       +1     
==========================================
  Hits          587      587              
- Misses         27       28       +1     

Flag	Coverage Δ
Pkg.test	93.69% <0.00%> (-0.16%)	:arrow_down:
Run.test	89.38% <0.00%> (-0.15%)	:arrow_down:

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Impacted Files	Coverage Δ
src/reduce.jl	95.77% <0.00%> (-0.30%)	:arrow_down:

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[tkf]

In xfail/init branch bb910acfd65a81773b1806019ee52ce84caa7c5d

test_init_in_loop: Error During Test at /home/runner/work/FLoops.jl/FLoops.jl/test/FLoopsTests/src/test_reduce.jl:176
  Test threw exception
  Expression: sum_arrays2([]) == UndefVarError(:s)
  unrechable reached (FLoops.jl bug)

https://github.com/JuliaFolds/FLoops.jl/runs/4770213614?check_suite_focus=true#step:6:136