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fix: Always parse parentheses for predicates (#5069)
A loooong time ago, Dafny supported `predicate` definitions without parentheses. Apparently, the parser still allowed that, which is wrong. This PR changes the parser to make sure that a predicate definition always includes parentheses. <small>By submitting this pull request, I confirm that my contribution is made under the terms of the [MIT license](https://github.com/dafny-lang/dafny/blob/master/LICENSE.txt).</small>
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The syntax of a predicate definition must always include parentheses. |