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pub fn gsub_apply_thai_lao(
    gsub_cache: &LayoutCache<GSUB>,
    gsub_table: &LayoutTable<GSUB>,
    gdef_table: Option<&GDEFTable>,
    script_tag: u32,
    lang_tag: Option<u32>,
    glyphs: &mut Vec<RawGlyph<()>>
) -> Result<(), ShapingError>