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1b70f687fa
Single point locations (equal boundaries) are troublesome, and we were incorrectly ending the style in their case. Which results in an abort in libtextstyle. There is also a confusion between columns as displayed on the screen (which take into account multibyte characters and tabulations), and the number of bytes. Counting the screen-column incrementally (character by character) is uneasy (because of multibyte characters), and I don't want to maintain a buffer of the current line when displaying the diagnostic. So I believe the simplest solution is to track the byte number in addition to the screen column. * src/location.h, src/location.c (boundary): Add the byte-column. Adjust dependencies. * src/getargs.c, src/scan-gram.l: Adjust. * tests/diagnostics.at: Check zero-width locations.