fix to unblock https://github.com/nim-lang/Nim/pull/14869

[timotheecour]

/cc @Vindaar somehow your packages are my usual suspect PR blockers; that's actually a good thing because it's better to catch problems early on (and figure out good solutions) before a PR is merged rather than "in the wild". So thanks for breaking my PR's ;-)

before this PR:
nim-lang/Nim#14869 fails only because of this package, giving:

2020-07-01T10:34:35.1005100Z �[1m�[31mFAIL: �[36mhttps://github.com/Vindaar/ggplotnim C�[0m
2020-07-01T10:34:35.1006090Z �[1m�[36mTest "https://github.com/Vindaar/ggplotnim" in category "nimble-packages-1"�[0m
2020-07-01T10:34:35.1008480Z �[1m�[31mFailure: reBuildFailed�[0m
2020-07-01T10:34:35.1015110Z package test failed
2020-07-01T10:34:35.1015800Z $ nim c -d:noCairo -r tests/tests.nim
2020-07-01T10:34:35.1017100Z Hint: used config file '/Users/runner/runners/2.263.0/work/Nim/Nim/config/nim.cfg' [Conf]
2020-07-01T10:34:35.1017970Z Hint: used config file '/Users/runner/runners/2.263.0/work/Nim/Nim/config/config.nims' [Conf]
2020-07-01T10:34:35.1019110Z Hint: used config file '/Users/runner/runners/2.263.0/work/Nim/Nim/pkgstemp/ggplotnim/tests/config.nims' [Conf]
2020-07-01T10:34:35.1019690Z ...............................................
2020-07-01T10:34:35.1020690Z /Users/runner/.nimble/pkgs/ginger-0.2.5/ginger.nim(1358, 40) Error: expression 'updateScale(view, it)' has no type (or is ambiguous)
2020-07-01T10:34:35.1020890Z 

after this PR:
it works.

• I'm inlining the definition of byLent (see add decls.byLent, turns an expression into a let nim-lang/Nim#14875), feel free to remove and use from std/decls import byLent after add decls.byLent, turns an expression into a let nim-lang/Nim#14875 has been merged.

• std/views (1st class openArrray, but not escape-safe); std/pointers; fixes sequtils.applyIt nim-lang/Nim#14869 makes applyIt more efficient (avoid un-needed copies) and more correct (wrt template param duplication evaluation bugs)

[Vindaar]

somehow your packages are my usual suspect PR blockers; that's actually a good thing because it's better to catch problems early on (and figure out good solutions) before a PR is merged rather than "in the wild". So thanks for breaking my PR's ;-)

Haha, that is good to hear. I was starting to worry you might be annoyed by that.

I haven't merged this yet, because your View PR is still a draft and the discussion there seems to favor it as a nimble package. I think it'd be a great addition. I wonder if with nim-lang/RFCs#88 implemented the API of View could remain the same, so that the PR could be merged in the mean time without worry that I'd (hopefully quickly) become outdated? Well, here isn't the best place to discuss this of course.

Also there being no documentation yet on lent in the manual makes me a little hesitant to merge it.