xref #357. @KristofferC, do you think this will retrigger #356?

If it tries to call ‘parse_cache_header‘ on a stale cache file, then probably.

Codecov Report

Merging #385 into master will decrease coverage by 0.36%.
The diff coverage is 69.23%.

@@            Coverage Diff             @@
##           master     #385      +/-   ##
==========================================
- Coverage   80.29%   79.92%   -0.37%     
==========================================
  Files          12       12              
  Lines        1370     1375       +5     
==========================================
- Hits         1100     1099       -1     
- Misses        270      276       +6

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They can be stale for many reasons, here the reason is https://github.com/JuliaLang/julia/blob/72126021e612e91289fddb4b9aa01d4d9ec96ba9/base/loading.jl#L1445.

I've wrapped the parse_cache_header in a try/catch, hopefully that will solve the problem. The only other thing I can think to do is modify the Manifest, and that seems like a bad idea.