Inconsistent use of curly braces

[wolfseifert]

In a single statement function

a: () -> int =
  13;

b: () -> int = {
  return 42;
}

and in a for-loop with only one statement

v: vector = (1, 2, 3, 4, 5);
for v do (i) {
  print("(i)$ ");
}
println();
for v do (i)
  print("(i)$ ");
println();

curly braces are optional.

But for if

b:= true;
if b {
  println("b is true");
} else {
  println("b is false");
}

and while

v := :vector = (1, 2, 3, 4, 5);
i := 0U;
while i < v.size() next i++ {
  print("(v[i])$ ");
}
println();

curly braces are mandatory. This seems inconsistent to me. Or do I miss something?

[JohelEGP]

See the thread at 26a4cbf#r128455814:

Right, that comments should only have mentioned while loops, which have the same introductory structure as if conditions in that the condition and the body can be grammatically adjacent.

Braces aren't required around for loop bodies.

And they happen to be required around do loop bodies, but in that case it's not for the reason that a conditional could be ambiguous/confusion, since the body isn't adjacent to a conditional expression. There it's just for readability taste reasons.

[wolfseifert]

Closing as duplicate of 26a4cbf#r128455814.