Crash: panicked at 'assertion failed: num_segments > 0'

[ErnWong]

wasm.js:437 panicked at 'assertion failed: num_segments > 0', /home/runner/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/lyon_tessellation-0.16.2/src/stroke.rs:1027:9

Stack:

Error
    at imports.wbg.__wbg_new_59cb74e423758ede (https://ernestwong.nz/dango-tribute/client/target/wasm.js:443:19)
    at console_error_panic_hook::Error::new::h799f20735cac74b5 (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[104024]:0x1bc1f1f)
    at console_error_panic_hook::hook_impl::hfe98f285576b7df7 (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[13912]:0xf66d55)
    at console_error_panic_hook::hook::h024505b23e1898e2 (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[115166]:0x1c5cc4b)
    at core::ops::function::Fn::call::h5de70dd740a33179 (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[97893]:0x1b61edb)
    at std::panicking::rust_panic_with_hook::h894f2bdeea4d0ce8 (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[31806]:0x14481ad)
    at std::panicking::begin_panic_handler::{{closure}}::he30feeb51ae9f99b (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[44794]:0x1676051)
    at std::sys_common::backtrace::__rust_end_short_backtrace::h83a4032c6b997446 (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[120244]:0x1c9c24d)
    at rust_begin_unwind (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[109028]:0x1c0a738)
    at core::panicking::panic_fmt::h0dfe153eb0ef456a (https://ernestwong.nz/dango-tribute/client/target/wasm_bg.wasm:wasm-function[120246]:0x1c9c2b3)


imports.wbg.__wbg_error_4bb6c2a97407129a @ wasm.js:437
wasm_bg.wasm:0x1d1e900 Uncaught RuntimeError: unreachable
    at __rust_start_panic (wasm_bg.wasm:0x1d1e900)
    at rust_panic (wasm_bg.wasm:0x1ccc83d)
    at std::panicking::rust_panic_with_hook::h894f2bdeea4d0ce8 (wasm_bg.wasm:0x14481d3)
    at std::panicking::begin_panic_handler::{{closure}}::he30feeb51ae9f99b (wasm_bg.wasm:0x1676051)
    at std::sys_common::backtrace::__rust_end_short_backtrace::h83a4032c6b997446 (wasm_bg.wasm:0x1c9c24d)
    at rust_begin_unwind (wasm_bg.wasm:0x1c0a738)
    at core::panicking::panic_fmt::h0dfe153eb0ef456a (wasm_bg.wasm:0x1c9c2b3)
    at core::panicking::panic::ha2f229d777a180c9 (wasm_bg.wasm:0x1b4a750)
    at lyon_tessellation::stroke::StrokeBuilder::tessellate_round_join::h374f8ac4bab2ff0d (wasm_bg.wasm:0x56e6dd)
    at lyon_tessellation::stroke::StrokeBuilder::tessellate_join::h6ed00a53e24f1c48 (wasm_bg.wasm:0x376f34)

[ErnWong]

I seem to be getting this consistently - what introduced this?

[ErnWong]

I also saw this:

wasm.js:294 Channel Incoming Error: packet channel is full

Not sure if relevant

[ErnWong]

I'm trying to find lyon_tessellation-0.16.2 but the version skips v0.16 and jumps from 0.15 to 0.17? nical/lyon@fe39f76#diff-a1cf2a57dec7eaebdfb0c729f82548032ad37f08221184cd6daca6df0a997067

[ErnWong]

If it's this assert, then it might be something fixed in newer versions (esp when that implementation has changed a lot and that the assert is no longer there).

https://github.com/nical/lyon/blame/0235217bfa9826f29e8d5fc5dbdfa8a6e35ebdff/tessellation/src/stroke.rs#L1012

Still quite spooky that it started breaking. What has changed?