Issue in Prefix Postfix Infix assignment

[senth54]

I am unable to test the basic Infix , see the bold error message below

Any method which takes a single parameter can be used as an infix operator: a.m(b) can also be written as a m b.

val g: Int = 3
(g + 4) should be(
g.+(4)
) // + is an infix operator
g.+(4) should be(
g + 4
)
Evaluation failed : Compilation Error ; ERROR -> not found: value g at [308, 308, 308]