USB exercise panics when using cyme for USB enumeration

[robamu]

When running the USB-5 solution and then running cyme, the application crashes inside the usb-2 parser:

rust-exercises/nrf52-code/usb-app-solutions on  main [$] is 📦 v0.0.0 via 🦀 v1.90.0 took 48s
❯ cargo run --bin usb-5
    Finished `dev` profile [optimized + debuginfo] target(s) in 0.02s
     Running `probe-rs run --chip=nRF52840_xxAA --allow-erase-all --log-format=oneline target/thumbv7em-none-eabihf/debug/usb-5`
Available Probes:
0: Digilent USB Device -- 0403:6014:210248B780F8 (FTDI)
1: J-Link -- 1366:1051:001050238928 (J-Link)
Selection: 1
      Erasing ✔ 100% [####################]  20.00 KiB @  26.92 KiB/s (took 1s)
  Programming ✔ 100% [####################]  20.00 KiB @  17.95 KiB/s (took 1s)                                                Finished in 1.86s
00:00:00.000000 [DEBUG] Initializing the board (dk dk/src/lib.rs:323)
00:00:00.000000 [DEBUG] Clocks configured (dk dk/src/lib.rs:341)
00:00:00.000000 [DEBUG] RTC started (dk dk/src/lib.rs:360)
00:00:00.000000 [DEBUG] I/O pins have been configured for digital output (dk dk/src/lib.rs:370)
00:00:00.310638 [DEBUG] USB: UsbReset @ 00:00:00.310607 (usb_5 src/bin/usb-5.rs:59)
00:00:00.310699 [WARN ] USB reset condition detected (usb_5 src/bin/usb-5.rs:63)
00:00:00.388916 [DEBUG] USB: UsbEp0Setup @ 00:00:00.388916 (usb_5 src/bin/usb-5.rs:59)
00:00:00.389007 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 64, windex: 0x0000, wvalue: 0x0100 (usb_5 src/bin/usb-5.rs:89)
00:00:00.389068 [INFO ] EP0: GetDescriptor { descriptor: Device, length: 64 } (usb_5 src/bin/usb-5.rs:100)
00:00:00.389404 [DEBUG] EP0IN: start 18B transfer (dk dk/src/usbd.rs:59)
00:00:00.389648 [DEBUG] USB: UsbEp0DataDone @ 00:00:00.389617 (usb_5 src/bin/usb-5.rs:59)
00:00:00.389709 [INFO ] EP0IN: transfer complete (usb_5 src/bin/usb-5.rs:68)
00:00:00.389770 [INFO ] EP0IN: transfer done (dk dk/src/usbd.rs:83)
00:00:00.390747 [DEBUG] USB: UsbReset @ 00:00:00.390747 (usb_5 src/bin/usb-5.rs:59)
00:00:00.390838 [WARN ] USB reset condition detected (usb_5 src/bin/usb-5.rs:63)
00:00:00.466796 [DEBUG] USB: UsbEp0Setup @ 00:00:00.466796 (usb_5 src/bin/usb-5.rs:59)
00:00:00.466888 [DEBUG] SETUP: bmrequesttype: 0b00000000, brequest: 5, wlength: 0, windex: 0x0000, wvalue: 0x000b (usb_5 src/bin/usb-5.rs:89)
00:00:00.466949 [INFO ] EP0: SetAddress { address: Some(11) } (usb_5 src/bin/usb-5.rs:100)
00:00:00.478790 [DEBUG] USB: UsbEp0Setup @ 00:00:00.478759 (usb_5 src/bin/usb-5.rs:59)
00:00:00.478851 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 18, windex: 0x0000, wvalue: 0x0100 (usb_5 src/bin/usb-5.rs:89)
00:00:00.478942 [INFO ] EP0: GetDescriptor { descriptor: Device, length: 18 } (usb_5 src/bin/usb-5.rs:100)
00:00:00.479248 [DEBUG] EP0IN: start 18B transfer (dk dk/src/usbd.rs:59)
00:00:00.479644 [DEBUG] USB: UsbEp0DataDone @ 00:00:00.479614 (usb_5 src/bin/usb-5.rs:59)
00:00:00.479705 [INFO ] EP0IN: transfer complete (usb_5 src/bin/usb-5.rs:68)
00:00:00.479766 [INFO ] EP0IN: transfer done (dk dk/src/usbd.rs:83)
00:00:00.481628 [DEBUG] USB: UsbEp0Setup @ 00:00:00.481628 (usb_5 src/bin/usb-5.rs:59)
00:00:00.481719 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 10, windex: 0x0000, wvalue: 0x0600 (usb_5 src/bin/usb-5.rs:89)
00:00:00.481781 [INFO ] EP0: GetDescriptor { descriptor: DeviceQualifier, length: 10 } (usb_5 src/bin/usb-5.rs:100)
00:00:00.482147 [WARN ] EP0IN: unexpected request; stalling the endpoint (usb_5 src/bin/usb-5.rs:74)
00:00:00.482757 [DEBUG] USB: UsbEp0Setup @ 00:00:00.482757 (usb_5 src/bin/usb-5.rs:59)
00:00:00.482849 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 10, windex: 0x0000, wvalue: 0x0600 (usb_5 src/bin/usb-5.rs:89)
00:00:00.482910 [INFO ] EP0: GetDescriptor { descriptor: DeviceQualifier, length: 10 } (usb_5 src/bin/usb-5.rs:100)
00:00:00.483276 [WARN ] EP0IN: unexpected request; stalling the endpoint (usb_5 src/bin/usb-5.rs:74)
00:00:00.483764 [DEBUG] USB: UsbEp0Setup @ 00:00:00.483734 (usb_5 src/bin/usb-5.rs:59)
00:00:00.483825 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 10, windex: 0x0000, wvalue: 0x0600 (usb_5 src/bin/usb-5.rs:89)
00:00:00.483917 [INFO ] EP0: GetDescriptor { descriptor: DeviceQualifier, length: 10 } (usb_5 src/bin/usb-5.rs:100)
00:00:00.484283 [WARN ] EP0IN: unexpected request; stalling the endpoint (usb_5 src/bin/usb-5.rs:74)
00:00:00.484771 [DEBUG] USB: UsbEp0Setup @ 00:00:00.484741 (usb_5 src/bin/usb-5.rs:59)
00:00:00.484832 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 9, windex: 0x0000, wvalue: 0x0200 (usb_5 src/bin/usb-5.rs:89)
00:00:00.484924 [INFO ] EP0: GetDescriptor { descriptor: Configuration { index: 0 }, length: 9 } (usb_5 src/bin/usb-5.rs:100)
00:00:00.485351 [DEBUG] EP0IN: start 9B transfer (dk dk/src/usbd.rs:59)
00:00:00.485626 [DEBUG] USB: UsbEp0DataDone @ 00:00:00.485626 (usb_5 src/bin/usb-5.rs:59)
00:00:00.485717 [INFO ] EP0IN: transfer complete (usb_5 src/bin/usb-5.rs:68)
00:00:00.485748 [INFO ] EP0IN: transfer done (dk dk/src/usbd.rs:83)
00:00:00.487640 [DEBUG] USB: UsbEp0Setup @ 00:00:00.487609 (usb_5 src/bin/usb-5.rs:59)
00:00:00.487701 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 18, windex: 0x0000, wvalue: 0x0200 (usb_5src/bin/usb-5.rs:89)
00:00:00.487792 [INFO ] EP0: GetDescriptor { descriptor: Configuration { index: 0 }, length: 18 } (usb_5 src/bin/usb-5.rs:100)
00:00:00.488220 [DEBUG] EP0IN: start 18B transfer (dk dk/src/usbd.rs:59)
00:00:00.488647 [DEBUG] USB: UsbEp0DataDone @ 00:00:00.488616 (usb_5 src/bin/usb-5.rs:59)
00:00:00.488708 [INFO ] EP0IN: transfer complete (usb_5 src/bin/usb-5.rs:68)
00:00:00.488739 [INFO ] EP0IN: transfer done (dk dk/src/usbd.rs:83)
00:00:00.490631 [DEBUG] USB: UsbEp0Setup @ 00:00:00.490631 (usb_5 src/bin/usb-5.rs:59)
00:00:00.490722 [DEBUG] SETUP: bmrequesttype: 0b00000000, brequest: 9, wlength: 0, windex: 0x0000, wvalue: 0x002a (usb_5 src/bin/usb-5.rs:89)
00:00:00.490783 [INFO ] EP0: SetConfiguration { value: Some(42) } (usb_5 src/bin/usb-5.rs:100)
00:00:00.491027 [INFO ] entering the configured state (usb_5 src/bin/usb-5.rs:207)
00:00:02.778991 [DEBUG] USB: UsbEp0Setup @ 00:00:02.778991 (usb_5 src/bin/usb-5.rs:59)
00:00:02.779083 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 4096, windex: 0x0000, wvalue: 0x0300 (usb_5 src/bin/usb-5.rs:89)
00:00:02.779144 [INFO ] EP0: GetDescriptor { descriptor: String { index: 0, lang_id: 0 }, length: 4096 } (usb_5 src/bin/usb-5.rs:100)
00:00:02.779602 [WARN ] EP0IN: unexpected request; stalling the endpoint (usb_5 src/bin/usb-5.rs:74)
00:00:02.780761 [DEBUG] USB: UsbEp0Setup @ 00:00:02.780731 (usb_5 src/bin/usb-5.rs:59)
00:00:02.780822 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 0, wlength: 2, windex: 0x0000, wvalue: 0x0000 (usb_5 src/bin/usb-5.rs:89)
00:00:02.780883 [INFO ] EP0: GetStatus(Device) (usb_5 src/bin/usb-5.rs:100)
00:00:02.781036 [WARN ] EP0IN: unexpected request; stalling the endpoint (usb_5 src/bin/usb-5.rs:74)
00:00:02.781707 [DEBUG] USB: UsbEp0Setup @ 00:00:02.781677 (usb_5 src/bin/usb-5.rs:59)
00:00:02.781768 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 0, wlength: 2, windex: 0x0000, wvalue: 0x0000 (usb_5 src/bin/usb-5.rs:89)
00:00:02.781829 [INFO ] EP0: GetStatus(Device) (usb_5 src/bin/usb-5.rs:100)
00:00:02.781982 [WARN ] EP0IN: unexpected request; stalling the endpoint (usb_5 src/bin/usb-5.rs:74)
00:00:02.782684 [DEBUG] USB: UsbEp0Setup @ 00:00:02.782684 (usb_5 src/bin/usb-5.rs:59)
00:00:02.782775 [DEBUG] SETUP: bmrequesttype: 0b10000000, brequest: 6, wlength: 2, windex: 0x0000, wvalue: 0x0a00 (usb_5 src/bin/usb-5.rs:89)
00:00:02.782836 [ERROR] panicked at src/bin/usb-5.rs:99:10:
Error parsing request: () (usb_app usb-app-solutions/src/lib.rs:8)
`dk::fail()` called; exiting ...
Firmware exited with: Unknown runtime error
Core 0
    Frame 0: syscall1 @ 0x000020ae inline
       /home/muellerr/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/cortex-m-semihosting-0.5.0/src/lib.rs:201:13
    Frame 1: report_exception @ 0x00000000000020ac inline
       /home/muellerr/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/cortex-m-semihosting-0.5.0/src/macros.rs:28:9
    Frame 2: exit @ 0x00000000000020ac
       /home/muellerr/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/cortex-m-semihosting-0.5.0/src/debug.rs:74:25
    Frame 3: fail @ 0x00001770
       /home/muellerr/Rust/rust-exercises/nrf52-code/boards/dk/src/lib.rs:462:9
    Frame 4: __cortex_m_rt_HardFault @ 0x00000df4
       /home/muellerr/Rust/rust-exercises/nrf52-code/usb-app-solutions/src/lib.rs:14:1

It might be a good idea to improve the usb2 error parsing and then print an error + continue instead of panicking. Right now, the error output is not too useful, although we get the raw request information that caused the error at the very least.