Incorrect len(x) > 0 suggestion

[TylerYep]

This suggestion changes the resulting code:

x = ""
is_negative = len(x) > 0 and x[0] == "-"   # Output: False

# Violates [FURB115]: Use `x` instead of `len(x) > 0`

x = ""
is_negative = x and x[0] == "-"   # Output: ""

[dosisod]

Yes, this is most definitely a bug. Refurb should check to make sure that x is being used in a situation where a bool is expected, like an if block.

Thank you for reporting this!