Type coersion inside tuple

[soanvig]

Rescript version: 11.1.3

Working code:

// Note: none of the values are casted to float
let (x, y) = (ev->DOM.MouseEvent.offsetX, ev->DOM.MouseEvent.offsetY)

// Note: both values are casted to float
let (x, y) = (ev->DOM.MouseEvent.offsetX, ev->DOM.MouseEvent.offsetY) :> (float, float)

// Note: only first value is casted to float
let (x, y) = (ev->DOM.MouseEvent.offsetX :> float, ev->DOM.MouseEvent.offsetY)

// Note: only second value is casted to float. *there are parens around the second item
let (x, y) = (ev->DOM.MouseEvent.offsetX, (ev->DOM.MouseEvent.offsetY :> float))

Not working code:

// Note: coersion in both values
// ERROR: Did you forget a `,` here?
let (x, y) = (ev->DOM.MouseEvent.offsetX :> float, ev->DOM.MouseEvent.offsetY :> float)

// Note: coersion only in second value
// ERROR: Did you forget a `,` here?
let (x, y) = (ev->DOM.MouseEvent.offsetX, ev->DOM.MouseEvent.offsetY :> float)

This looks like a bug (or syntax incosistency at least), because type coersion for first item works without parens, but doesn't work for the second (requires parens). It looks like a parser bug.