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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>
20 lines
500 B
Nim
20 lines
500 B
Nim
discard """
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action: compile
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errormsg: "writeSomething() has an illegal effect: WriteIO"
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line: 19
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"""
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type
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IO = object of RootEffect ## input/output effect
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ReadIO = object of IO ## input effect
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WriteIO = object of IO ## output effect
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proc readSomething(): string {.tags: [ReadIO].} = ""
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proc writeSomething(): void {.tags: [WriteIO].} = echo "..."
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proc noWritesPlease() {.forbids: [WriteIO].} =
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# this is OK:
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echo readSomething()
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# the compiler prevents this:
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writeSomething()
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