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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
commit efd5c571bf
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24 changed files with 405 additions and 71 deletions
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tests/effects/teffects19.nim Normal file
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discard """
action: compile
errormsg: "type mismatch: got <proc (i: int){.gcsafe, locks: 0.}>"
line: 23
"""
type MyEffect = object
type ProcType1 = proc (i: int): void {.forbids: [MyEffect].}
type ProcType2 = proc (i: int): void
proc caller1(p: ProcType1): void = p(1)
proc caller2(p: ProcType2): void = p(1)
proc effectful(i: int): void {.tags: [MyEffect].} = echo $i
proc effectless(i: int): void {.forbids: [MyEffect].} = echo $i
proc toBeCalled1(i: int): void = effectful(i)
proc toBeCalled2(i: int): void = effectless(i)
caller1(toBeCalled2)
caller2(toBeCalled1)
caller2(toBeCalled2)
caller1(toBeCalled1)