Update ParserAttribute.cs

LanguageDev / Yoakke

A collection of libraries for implementing compilers in .NET.

https://languagedev.github.io/Yoakke/

Apache License 2.0

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Closed LPeter1997 closed 2 years ago

LPeter1997 commented 2 years ago

Added nullable annotation to get rid of build warning. Closes #142