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In the existing situation, the package-decl always requires a semicolon at the end, which has some unexpected effects for nested package definitions:
Incorrectly considered valid according to the current grammar:
Note the semicolon between the package name and the curly braces.
Incorrectly considered invalid according to the current grammar:
In order to fix this, this PR lifts the semicolon token out of the package-decl rule, into the wit-file rule.