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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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compiler/ast.nim
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@ -347,7 +347,8 @@ const
ensuresEffects* = 2 # 'ensures' annotation
tagEffects* = 3 # user defined tag ('gc', 'time' etc.)
pragmasEffects* = 4 # not an effect, but a slot for pragmas in proc type
effectListLen* = 5 # list of effects list
forbiddenEffects* = 5 # list of illegal effects
effectListLen* = 6 # list of effects list
nkLastBlockStmts* = {nkRaiseStmt, nkReturnStmt, nkBreakStmt, nkContinueStmt}
# these must be last statements in a block