Flow generic comment formatted incorrectly

[helixbass]

Prettier 1.11.1
Playground link

Input:

const identity = function/*::<T>*/(value/*: T */)/*: T */ {
  return value;
};

Output:

const identity = function(/*::<T>*/ value /*: T */) /*: T */ {
  return value;
};

Expected behavior:
It seems as though the generic comment /*::<T>*/ needs to remain between the function keyword and the ( in order for the Flow parser to correctly recognize the comment (pasting Prettier's output into https://flow.org/try gives errors). Not sure if there is a corresponding case for arrow functions or not

[helixbass]

Here are two other Flow comment syntaxes that seem not to be formatted correctly (ie in such a way that Flow will still parse them):

const x = ([1, 2, 3]/*: Array<number> */);

gets formatted as:

const x = [1, 2, 3]; /*: Array<number> */

and this:

([1, 2, 3]/*: Array<number> */);

gets formatted as:

[1, 2, 3] /*: Array<number> */;

Basically both need to preserve the surrounding parens

[thorn0]

Not an issue anymore because support for Flow comments was removed in #13687