Allow line break before where keyword

[felipenoris]

Valid syntax:

function myfunc(x::T) where {T}
    x
end

Invalid syntax:

function myfunc2(x::T)
    where {T}
    x
end

Error message for invalid syntax

ERROR: LoadError: syntax: space before "{" not allowed in "where {"

[yuyichao]

Valid syntax

function myfunc2(x::T)
    where{T}
    x
end

[StefanKarpinski]

That’s funny. Would be nice to allow the where on the next line if possible.