using_to_diff3_block  178 src/diff3.c    static struct diff3_block *using_to_diff3_block (struct diff_block *[2], struct diff_block *[2], int, int, struct diff3_block const *);
using_to_diff3_block  670 src/diff3.c          tmpblock = using_to_diff3_block (using, last_using,