It could be written as:
@spec bmi_tell(float()) :: String.t()
def bmi_tell(bmi)
when bmi <= 18.5, do: "You're underweight!"
def bmi_tell(bmi)
when bmi <= 25.0, do: "You're supposedly normal."
def bmi_tell(bmi)
when bmi <= 30.0, do: "You're little too much!"
def bmi_tell(bmi)
when true, do: "No way!"
Yes, it’s a bit more verbose, but AFAICT the syntax you proposed is impossible to use as is, since def is a macro and it expects the keyword argument do to follow after guards.
