Simplify `for` clause


#1

Instead:

for {
x <- monadEffect()
_ = directSideEffect(x)
} yield pureValue(x)

write just:

for {
x <- monadEffect()
directSideEffect(x)
} yield pureValue(x)

Haskell has similar feature in do notation with implicit >> operator. Scala compiler can optimise such for expressions in proper way.


#2

I agree.