fix test string_vars to never parse input of `ls` and never delete the
created folders, because deletion breaks CI for unclear reasons.

removes unnecessary unsafe blocks in ion
upstream nix also has them removed
bump dependencies, when we change lock file anyway
fix some warnings

AdminXVII authored 5 years ago and Michael Aaron Murphy committed 5 years ago

Add to the builtin proc macro a feature to export the manual to a file
in manual/builtins
When generating the manual for gitlab, take those and generate a always
up-to-date page

Switch to 1.31.0, not 1.30.0
Set correct toolchain in CI

This is one step closer toward 1.32.0, where the 2018 edition is stable.
Mostly refactoring the imports and giving function parameters name in traits