Describe the bug

When trying to call a function with exactly 6 arguments at the REPL, Nu panics when typing the 4th argument.

How to reproduce

Define the following function:

def f [a b c d e f] { }

Then, at the REPL, try calling it with the following parameters:

f 1 2 3

Trying to write any character after 3 (note the space) will cause Nu to panic with the message:

Error:   × Main thread panicked.                                                                                                                               
  ├─▶ at crates/nu-parser/src/parser.rs:926:28
  ╰─▶ index out of bounds: the len is 2 but the index is 3
  help: set the `RUST_BACKTRACE=1` environment variable to display a backtrace.

The issue only occurs if f has exactly 6 parameters. The names and type signatures of the function and parameters don't seem to affect the outcome.

I've observed the issue on Nu v0.98.0, on both Linux and Android (Termux), and it occurs even with nu --no-config-file.

Expected behavior

I expect to be able to call the command as usual. For example, f 1 2 3 4 5 6.

Configuration