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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>
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Lancer11211 2022-07-26 07:40:49 +02:00 • committed by GitHub
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compiler/semstmts.nim
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@ -2300,7 +2300,7 @@ proc semPragmaBlock(c: PContext, n: PNode): PNode =
for p in pragmaList:
if whichPragma(p) == wCast:
case whichPragma(p[1])
of wGcSafe, wNoSideEffect, wTags, wRaises:
of wGcSafe, wNoSideEffect, wTags, wForbids, wRaises:
discard "handled in sempass2"
of wUncheckedAssign:
inUncheckedAssignSection = 1