functions starting with @ don't work correctly

[peachey2k2]

What happened, and what did you expect to happen?

When I define a function that starts with the character @, it does get parsed with no issues. However, when I try to use the function, I get an error

~> fn @test {|| echo "hello"}
~> @test
Exception: exec: "@test": executable file not found in $PATH
  [tty 6]:1:1-5: @test

The weird part is that if I tab complete from an empty string, it does show up (otherwise it doesn't show up in there either)

I'm pretty new to elvish and don't know if not being able to do this is intended, but it definitely doesn't feel like so.

Output of "elvish -version"

0.21.0

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[iandol]

https://elv.sh/ref/language.html#variable -- does not mention @ as an acceptable character in the ascii range. @ is used to expand lists, so put $@x and put $x both refer to $x, therefore I think @ cannot be a valid variable name character, given that function names are variables in my limited understanding...

I know x-cmd uses @ to trigger AI completions, which is cool, but in this case another character could be used that is non-ascii but accessible, on macOS it is easy as many unicode character are easily accessible using option and/or shift, but on Linux it seems much less choice...