Panic when highlight_code = true in config.toml

[pka]

config.toml:

title = "example"
base_url = "http://example.com/"
highlight_code = true

gutenberg serve:

Building site...
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Custom("invalid value: integer `4284898127`, expected variant index 0 <= i < 4")', /checkout/src/libcore/result.rs:859
stack backtrace:
   0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace
             at /checkout/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::_print
             at /checkout/src/libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at /checkout/src/libstd/sys_common/backtrace.rs:60
             at /checkout/src/libstd/panicking.rs:355
   3: std::panicking::default_hook
             at /checkout/src/libstd/panicking.rs:371
   4: std::panicking::rust_panic_with_hook
             at /checkout/src/libstd/panicking.rs:549
   5: std::panicking::begin_panic
             at /checkout/src/libstd/panicking.rs:511
   6: std::panicking::begin_panic_fmt
             at /checkout/src/libstd/panicking.rs:495
   7: rust_begin_unwind
             at /checkout/src/libstd/panicking.rs:471
   8: core::panicking::panic_fmt
             at /checkout/src/libcore/panicking.rs:69
   9: core::result::unwrap_failed
  10: std::sync::once::Once::call_once::{{closure}}
  11: std::sync::once::Once::call_inner
             at /checkout/src/libstd/sync/once.rs:307
  12: gutenberg::rendering::markdown::markdown_to_html::{{closure}}
  13: <core::iter::Map<I, F> as core::iter::iterator::Iterator>::next
  14: gutenberg::rendering::markdown::markdown_to_html
  15: gutenberg::content::page::Page::render_markdown
  16: gutenberg::site::Site::load
  17: gutenberg::cmd::serve::serve
  18: gutenberg::main
  19: __rust_maybe_catch_panic
             at /checkout/src/libpanic_unwind/lib.rs:98
  20: std::rt::lang_start
             at /checkout/src/libstd/panicking.rs:433
             at /checkout/src/libstd/panic.rs:361
             at /checkout/src/libstd/rt.rs:57
  21: __libc_start_main
  22: <unknown>

Without last line in config.toml, the server is working. I couldn't find out which content page is triggering the error.

Gutenberg 0.0.7 - installed with cargo install gutenberg on Linux.

[Keats]

That's this issue in Cargo: rust-lang/cargo#2263 where it doesn't use lock files for binaries. Syntect had a new version published with a new format for syntax - a breaking change - as a minor version.

I will stop publishing on crates.io when reaching 0.1.0 if this issue is not resolved by then since it seems to cause issues.