"#$-1" interpreted as shorthand global interpolation, is just a string literal

[Earlopain]

puts "#$-1" => # "\#$-1"

# Current:
s(:dstr,
  s(:gvar, :$-1))
# I would expect:
s(:str, "\#$-1")

Uncertain of the rules, it seems to be a valid global variable name 🤷