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Disallow nil dereference at compile time (#16032)

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* bring back the semfold of nil

* remove space

* fix test

* proc type can't be dereferenced

* disallow nil dereference at compile time

* changelog
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cooldome 2020-11-18 22:30:28 +00:00 • committed by GitHub
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changelog.md
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@ -51,7 +51,7 @@
- The `cstring` doesn't support `[]=` operator in JS backend.
- nil dereference is not allowed at compile time. `cast[ptr int](nil)[]` is rejected at compile time.
## Compiler changes