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Allow let to not have value when using importc (#14258)

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* Allow let to not have value when using importc

This allows a let statement with the `{.importc.}` pragma to not be
initialised with a value. This allows us to declare C constants as Nim
lets without putting the value in the Nim code (which can lead to
errors, and requires us to go looking for the value). Fixes #14253

* Proper fix and documentation + changelog entry

* Improve testcase with one from timotheecour

* Add test to verify it working with macros
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PMunch 2020-05-12 20:28:18 +02:00 • committed by GitHub
commit 9acbf99efb
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discard """
errormsg: "'let' symbol requires an initialization"
line: "7"
"""
# Test that this still works when not annotated with importc
let test: cint
echo test