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The code had a nested use of the follow() function that could cause +=+ and -=- to register as ++ and --. The first follow() to execute could consume a character and match and then the second follow() could consume another character and match. For example i-=-10 would result in a syntax error and i-=- would decrement i.
Abstract -------- This is a port of various original Plan 9 tools for Unix, based on plan9port[1]. See the LICENSE file for license details. Installation ------------ Edit config.mk to match your local setup and execute 'make install' (if necessary as root). By default, 9base is installed into its own hierarchy, /usr/local/plan9. This is done to avoid conflicts with the standard tools of your system. Credits ------- Many thanks go to Lucent, the Bell Labs which developed this fine stuff and to Russ Cox for his plan9port. References ---------- [1] http://swtch.com/plan9port/ --Anselm R Garbe