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.forbids pragma: defining forbidden tags (#20050)

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* .forbids pragma: defining illegal effects for proc types

This patch intends to define the opposite of the .tags pragma: a way to define effects which are not allowed in a proc.

* updated documentation and changelogs for the forbids pragma

* renamed notTagEffects to forbiddenEffects

* corrected issues of forbids pragma

the forbids pragma didn't handle simple restrictions properly and it also had issues with subtyping

* removed incorrect character from changelog

* added test to cover the interaction of methods and the forbids pragma

* covering the interaction of the tags and forbids pragmas

* updated manual about the forbids pragma

* removed useless statement

* corrected the subtyping of proc types using the forbids pragma

* updated manual for the forbids pragma

* updated documentations for forbids pragma

* updated nim docs

* updated docs with rsttester.nim

* regenerated documentation

* updated rst docs

* Update changelog.md

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

* updated changelog

* corrected typo

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
This commit is contained in:
Lancer11211 2022-07-26 07:40:49 +02:00 • committed by GitHub
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24 changed files with 405 additions and 71 deletions
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19
tests/effects/teffects13.nim Normal file
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@ -0,0 +1,19 @@
discard """
action: compile
errormsg: "writeSomething() has an illegal effect: WriteIO"
line: 19
"""
type
IO = object of RootEffect ## input/output effect
ReadIO = object of IO ## input effect
WriteIO = object of IO ## output effect
proc readSomething(): string {.tags: [ReadIO].} = ""
proc writeSomething(): void {.tags: [WriteIO].} = echo "..."
proc noWritesPlease() {.forbids: [WriteIO].} =
# this is OK:
echo readSomething()
# the compiler prevents this:
writeSomething()