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13: core::panicking::panic::hc3763f3effcb9929
    at <unknown source file>
14: rustybuzz::hb::buffer::hb_buffer_t::move_to::he6a9580defbf1514
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/buffer.rs:1156
    1154 │         }
    1155 │
    1156 >         assert!(i <= self.out_len + (self.len - self.idx));
    1157 │
    1158 │         if self.out_len < i {
15: rustybuzz::hb::ot_layout_gsubgpos::apply_lookup::hb0bb938a671a37e1
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_layout_gsubgpos.rs:980
     978 │     }
     979 │
     980 >     ctx.buffer.move_to(end);
     981 │ }
     982 │
16: <ttf_parser::ggg::chained_context::ChainedContextLookup as rustybuzz::hb::ot_layout_gsubgpos::Apply>::apply::h6da40ea28f40f5f6
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_layout_gsubgpos.rs:663
     661 │                 ctx.buffer
     662 │                     .unsafe_to_break_from_outbuffer(Some(start_index), Some(end_index));
     663 >                 apply_lookup(
     664 │                     ctx,
     665 │                     usize::from(input_coverages.len()),
17: rustybuzz::hb::ot_layout_gsub_table::<impl rustybuzz::hb::ot_layout_gsubgpos::Apply for ttf_parser::tables::gsub::SubstitutionSubtable>::apply::h3f7e621c5b38371c
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_layout_gsub_table.rs:49
      47 │             Self::Ligature(t) => t.apply(ctx),
      48 │             Self::Context(t) => t.apply(ctx),
      49 >             Self::ChainContext(t) => t.apply(ctx),
      50 │             Self::ReverseChainSingle(t) => t.apply(ctx),
      51 │         }
18: rustybuzz::hb::ot::layout::GSUB::subst_lookup::<impl rustybuzz::hb::ot_layout_gsubgpos::Apply for rustybuzz::hb::ot_layout_common::SubstLookup>::apply::h1180360a0b8d580a
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot/layout/GSUB/subst_lookup.rs:35
      33 │         if self.digest().may_have_glyph(ctx.buffer.cur(0).as_glyph()) {
      34 │             for subtable in &self.subtables {
      35 >                 if subtable.apply(ctx).is_some() {
      36 │                     return Some(());
      37 │                 }
19: rustybuzz::hb::ot_layout::apply_forward::h40254d8f0cec948a
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_layout.rs:302
     300 │         if (cur.mask & ctx.lookup_mask()) != 0
     301 │             && ctx.check_glyph_property(cur, ctx.lookup_props)
     302 >             && lookup.apply(ctx).is_some()
     303 │         {
     304 │             ret = true;
20: rustybuzz::hb::ot_layout::apply_string::h41a8546a60574f08
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_layout.rs:282
     280 │         }
     281 │         ctx.buffer.idx = 0;
     282 >         apply_forward(ctx, lookup);
     283 │
     284 │         if !T::IN_PLACE {
21: rustybuzz::hb::ot_layout::apply_layout_table::h29833b22a4aa51bc
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_layout.rs:256
     254 │                     ctx.per_syllable = lookup_map.per_syllable;
     255 │
     256 >                     apply_string::<T>(&mut ctx, lookup);
     257 │                 }
     258 │             }
22: rustybuzz::hb::ot_layout_gsub_table::substitute::h1449b349b6791f0f
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_layout_gsub_table.rs:13
      11 │
      12 │ pub fn substitute(plan: &hb_ot_shape_plan_t, face: &hb_font_t, buffer: &mut hb_buffer_t) {
      13 >     apply_layout_table(plan, face, buffer, face.gsub.as_ref());
      14 │ }
      15 │
23: rustybuzz::hb::ot_shape::hb_ot_substitute_plan::hccd88507dd191d9a
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_shape.rs:393
     391 │         aat_layout::hb_aat_layout_substitute(ctx.plan, ctx.face, ctx.buffer);
     392 │     } else {
     393 >         super::ot_layout_gsub_table::substitute(ctx.plan, ctx.face, ctx.buffer);
     394 │     }
     395 │ }
24: rustybuzz::hb::ot_shape::substitute_pre::hcbfcfe8bf658fb43
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_shape.rs:346
     344 │ fn substitute_pre(ctx: &mut hb_ot_shape_context_t) {
     345 │     hb_ot_substitute_default(ctx);
     346 >     hb_ot_substitute_plan(ctx);
     347 │
     348 │     if ctx.plan.apply_morx && ctx.plan.apply_gpos {
25: rustybuzz::hb::ot_shape::shape_internal::hc835d90c43eef53c
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/ot_shape.rs:334
     332 │     }
     333 │
     334 >     substitute_pre(ctx);
     335 │     position(ctx);
     336 │     substitute_post(ctx);
26: rustybuzz::hb::shape::shape_with_plan::h2df57445f599ab4b
    at /Users/simon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustybuzz-0.20.0/src/hb/shape.rs:71
      69 │         #[cfg(not(feature = "wasm-shaper"))]
      70 │         {
      71 >             shape_internal(&mut hb_ot_shape_context_t {
      72 │                 plan,
      73 │                 face,
27: diffenator3_lib::render::renderer::tests::test_rustybuzz_crash::he1916ce60e7b4dcd
    at /Users/simon/hacks/typography/diffenator3/diffenator3-lib/src/render/renderer.rs:223
     221 │         );
     222 │
     223 >         let output = shape_with_plan(&face, &plan, buffer);
     224 │         panic!("Fail")
     225 │     }