`thread '<unnamed>' panicked at .../typeshare-cli-1.9.2/src/main.rs:293:17:`

[HHogg]

Typeshare cli panics with the following error.

thread 'main' panicked at /Users/.../.cargo/registry/src/index.crates.io-6f17d22bba15001f/typeshare-cli-1.9.2/src/main.rs:293:17:
expected identifier, found keyword `use`
stack backtrace:
   0:        0x102f026d0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h86895059245fddf1
   1:        0x102f1dc3c - core::fmt::write::h96560297a130d185
   2:        0x102effd84 - std::io::Write::write_fmt::hcce57c840fbfb93a
   3:        0x102f02528 - std::sys_common::backtrace::print::h4dcf9b42b72e8c39
   4:        0x102f03684 - std::panicking::default_hook::{{closure}}::haf8740723901d1d4
   5:        0x102f03378 - std::panicking::default_hook::hc9f6c915d03e3556
   6:        0x102f03f3c - std::panicking::rust_panic_with_hook::h08681e217444fcc3
   7:        0x102f0396c - std::panicking::begin_panic_handler::{{closure}}::hb4d9896bcc795caa
   8:        0x102f02b58 - std::sys_common::backtrace::__rust_end_short_backtrace::hab39235fb9e6a0f5
   9:        0x102f036dc - _rust_begin_unwind
  10:        0x102f37184 - core::panicking::panic_fmt::hb05658191fed4684
  11:        0x102c46d0c - core::panicking::panic_display::hed42836686819ed7
  12:        0x102f26658 - typeshare::main::{{closure}}::panic_cold_display::ha322968e8cffc1a9
  13:        0x102c44424 - core::ops::function::impls::<impl core::ops::function::FnMut<A> for &F>::call_mut::h3d7ef825d62a20d7
  14:        0x102c401b8 - <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::fold::heb9a411113f1bded
  15:        0x102c4e894 - rayon::iter::plumbing::bridge_producer_consumer::helper::h6b258642959e9bf6
  16:        0x102c49428 - typeshare::main::h60b45878a40fcb8d
  17:        0x102c52058 - std::sys_common::backtrace::__rust_begin_short_backtrace::h7e39e6a60a797819
  18:        0x102c586ec - std::rt::lang_start::{{closure}}::he992f89ddef17f3e
  19:        0x102ef9ce0 - std::rt::lang_start_internal::h4fe1c69f59f9e9bd
  20:        0x102c4a70c - _main

From this fn signature...

fn iter(&self) -> impl Iterator<Item = (f64, f64)> + use<'_, TEntryValue> {
  ...
}

Works fine when changed to

pub fn iter_points(&self) -> impl Iterator<Item = (f64, f64)> + '_ {

It was quite hard to track this down as the panic didn't display any information about what file or line of code it was failing on.

[darrell-roberts]

That sounds like our version of syn is not up to date with precise capturing use syntax yet. I'll take a look as well as seeing if we can improve the parsing error logging as well.