Own-line block comment after a type annotation's : or after ... is unstable #20174

Prettier 3.9.9

Example 1

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--parser typescript

Input:

let a:
  /* c */
  T;

Output:

let a: /* c */
T;

Second Output:

let a: /* c */ T;

Example 2

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--parser typescript

Input:

f(...
  /* c */
  a);

Output:

f(
  .../* c */
  a,
);

Second Output:

f(.../* c */ a);

Expected output

let a: /* c */ T;

f(.../* c */ a);

Why?

The first format prints T on the next line without indentation, and breaks the call after .../* c */. The second format joins the lines.

Related: #11777 (a multi-line comment after a type).

Also reproduces on main (88d8e96).