Panics with 'attempt to shift right with overflow' #649
Description
I've been using a python script that utilises the faker and mdgen libraries to generate markdown posts to test out my SSG project, but pulldown_cmark panics with the following on the first post:
Finished dev [unoptimized + debuginfo] target(s) in 0.03s
Running `target\debug\reproduce_pulldown_cmark_bug.exe`
thread 'main' panicked at 'attempt to shift right with overflow', C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:1815:21
stack backtrace:
0: std::panicking::begin_panic_handler
at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library\std\src\panicking.rs:579
1: core::panicking::panic_fmt
at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library\core\src\panicking.rs:64
2: core::panicking::panic
at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library\core\src\panicking.rs:114
3: pulldown_cmark::firstpass::simd::process_mask<pulldown_cmark::firstpass::impl$0::parse_line::closure_env$0,pulldown_cmark::parse::Item>
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:1815
4: pulldown_cmark::firstpass::simd::simd_iterate_special_bytes<pulldown_cmark::firstpass::impl$0::parse_line::closure_env$0,pulldown_cmark::parse::Item>
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:1841
5: pulldown_cmark::firstpass::simd::iterate_special_bytes<pulldown_cmark::firstpass::impl$0::parse_line::closure_env$0,pulldown_cmark::parse::Item>
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:1790
6: pulldown_cmark::firstpass::iterate_special_bytes<pulldown_cmark::firstpass::impl$0::parse_line::closure_env$0,pulldown_cmark::parse::Item>
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:1539
7: pulldown_cmark::firstpass::FirstPass::parse_line
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:461
8: pulldown_cmark::firstpass::FirstPass::parse_paragraph
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:328
9: pulldown_cmark::firstpass::FirstPass::parse_block
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:202
10: pulldown_cmark::firstpass::FirstPass::run
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:53
11: pulldown_cmark::firstpass::run_first_pass
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\firstpass.rs:35
12: pulldown_cmark::parse::Parser::new_with_broken_link_callback
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\parse.rs:182
13: pulldown_cmark::parse::Parser::new_ext
at C:\Users\jawad\.cargo\registry\src\github.com-1ecc6299db9ec823\pulldown-cmark-0.9.3\src\parse.rs:169
14: reproduce_pulldown_cmark_bug::main
at .\src\main.rs:8
15: core::ops::function::FnOnce::call_once<void (*)(),tuple$<> >
at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc\library\core\src\ops\function.rs:250
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: process didn't exit successfully: `target\debug\reproduce_pulldown_cmark_bug.exe` (exit code: 101)
I managed to put together a somewhat minimal reproducible example of the bug at https://github.com/jawadcode/reproduce_pulldown_cmark_bug, apologies for not being able to condense it further.