substitute_start 1304 third_party/harfbuzz-ng/src/hb-ot-layout-gsub-table.hh   static inline void substitute_start (hb_font_t *font, hb_buffer_t *buffer);
substitute_start  688 third_party/harfbuzz-ng/src/hb-ot-layout.cc   OT::GSUB::substitute_start (font, buffer);