ParseError in scalar affine ivp

[mforets]

using MathematicalSystems, IntervalArithmetic

p = @ivp(x' = -x + 1.0, x(0) ∈ 0..1)
Base.Meta.ParseError("\"*\" is not a unary operator")

Stacktrace:
 [1] @ivp(::LineNumberNode, ::Module, ::Vararg{Any,N} where N) at /home/mforets/.julia/dev/MathematicalSystems/src/macros.jl:930