Bat Panics on Haskell Source Code #314
Description
Both Bat 0.7.0 and 20b02e7 (latest checkout of master) panic on very basic Haskell source code. Since it doesn't panic when piping the output, or upon further inspection, when I remove any type declarations (which look like main :: IO ()), it seems that the issue may lie in the syntax highlighter.
I've also confirmed that Bat works perfectly fine with a bunch of other regular files I have lying around, just to be sure.
Here's the error/output with RUST_BACKTRACE=1 on 20b02e7:
bat env RUST_BACKTRACE=1 cargo run --release ../Program.hs
Finished release [optimized] target(s) in 0.35s
Running `target/release/bat ../Program.hs`
thread 'main' panicked at 'begin <= end (7 <= 5) when slicing `main :: IO ()
`', libcore/str/mod.rs:2098:5
stack backtrace:
0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
1: std::sys_common::backtrace::print
at libstd/sys_common/backtrace.rs:71
at libstd/sys_common/backtrace.rs:59
2: std::panicking::default_hook::{{closure}}
at libstd/panicking.rs:211
3: std::panicking::default_hook
at libstd/panicking.rs:227
4: std::panicking::rust_panic_with_hook
at libstd/panicking.rs:511
5: std::panicking::continue_panic_fmt
at libstd/panicking.rs:426
6: rust_begin_unwind
at libstd/panicking.rs:337
7: core::panicking::panic_fmt
at libcore/panicking.rs:92
8: core::str::slice_error_fail
at libcore/str/mod.rs:0
9: core::str::traits::<impl core::slice::SliceIndex<str> for core::ops::range::Range<usize>>::index::{{closure}}
10: <syntect::highlighting::highlighter::HighlightIterator<'a, 'b> as core::iter::iterator::Iterator>::next
11: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
12: syntect::easy::HighlightLines::highlight
13: <bat::printer::InteractivePrinter<'a> as bat::printer::Printer>::print_line
14: bat::controller::Controller::run
15: bat::main
16: std::rt::lang_start::{{closure}}
17: std::panicking::try::do_call
at libstd/rt.rs:59
at libstd/panicking.rs:310
18: __rust_maybe_catch_panic
at libpanic_unwind/lib.rs:105
19: std::rt::lang_start_internal
at libstd/panicking.rs:289
at libstd/panic.rs:392
at libstd/rt.rs:58
20: main
21: __libc_start_main
22: _start
───────┬─────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ File: Program.hs
───────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────
1 │ module Main where
2 │
And here is the most minimal Haskell source code Bat panics on:
module Main where
main :: IO ()
main = putStrLn "Please show my file :c"