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no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.3 Precedence: list Reply-To: Ruby developers Subject: [ruby-core:117620] [Ruby master Bug#20439] Invalid string format with n$ flag is ignored in some case List-Id: Ruby developers Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: "tompng (tomoya ishida) via ruby-core" Cc: "tompng (tomoya ishida)" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Issue #20439 has been reported by tompng (tomoya ishida). ---------------------------------------- Bug #20439: Invalid string format with n$ flag is ignored in some case https://bugs.ruby-lang.org/issues/20439 * Author: tompng (tomoya ishida) * Status: Open * ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) +YJIT +MN [arm64-darwin22] * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- String format including n$ flag and no type specifier raises ArgumentError ~~~ruby "%1$ " % 1 # invalid format character - % (ArgumentError) "%1$," % 1 # malformed format string - %, (ArgumentError) ~~~ But when it ends with n$ flag, or the next char to n$ flag is `"\n"` or `"\0"`, there is no error. Returns string with n$ flag removed. ~~~ruby "%1$\n" % 1 #=> "%\n" "%1$\0" % 1 #=> "%\u0000" "%1$" % 1 #=> "%" ~~~ -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/