Returns a term that is functionally equivalent to t, however if t is of the form ((y1, ..., yn) => e2)(e1, ..., en) then it optimizes the top most call by returning Some with the result of beta-reducing the function application. Similarly, all outermost curried function applications will be beta-reduced, if possible. Otherwise returns None.
To retain semantics the argument ei is bound as val yi = ei and by-name arguments to def yi = ei. Some bindings may be elided as an early optimization.
Example: scala sc:nocompile ((a: Int, b: Int) => a + b).apply(x, y) will be reduced to scala sc:nocompile val a = x val b = y a + b
Generally: scala sc:nocompile ([X1, Y1, ...] => (x1, y1, ...) => ... => [Xn, Yn, ...] => (xn, yn, ...) => f[X1, Y1, ..., Xn, Yn, ...](x1, y1, ..., xn, yn, ...))).apply[Tx1, Ty1, ...](myX1, myY1, ...)....apply[Txn, Tyn, ...](myXn, myYn, ...) will be reduced to scala sc:nocompile type X1 = Tx1 type Y1 = Ty1 ... val x1 = myX1 val y1 = myY1 ... type Xn = Txn type Yn = Tyn ... val xn = myXn val yn = myYn ... f[X1, Y1, ..., Xn, Yn, ...](x1, y1, ..., xn, yn, ...)
Scala 3