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: parser
+ %W(...) notation, word list literal like %w(...) with the
+ exception that #{} interpolation is allowed.
+
+: parser
+
+ Now arbitrary statements are allowed inside #{} interpolation
+ without escapes. In other hand, they can no longer access to
+ variables defined in eval.
+
+: parser
+
Digits preceded minus sign is a literal integer.
: IO::sysopen