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Raised when the query given to a pattern is either invalid Ruby syntax or is using syntax that we don’t yet support.

Methods
N

Class Public methods

new(repr)

Create a new CompilationError with the given representation of the node that caused the error.

Source: show | on GitHub 

# File ruby/lib/prism/pattern.rb, line 43
      def initialize(repr)
        super(<<~ERROR)
          prism was unable to compile the pattern you provided into a usable
          expression. It failed on to understand the node represented by:

          #{repr}

          Note that not all syntax supported by Ruby's pattern matching syntax
          is also supported by prism's patterns. If you're using some syntax
          that you believe should be supported, please open an issue on
          GitHub at https://github.com/ruby/prism/issues/new.
        ERROR
      end