Compiler fails to parse expressions surrounded by braces in some cases

[TropicSapling]

For example, this line fails to parse:

let res = 1 * 2 + {3 ** 4} * 5 + 6;

That specific line is pretty easy to fix parsing for, but more complex things like this must also be supported:

func f -> int {
  {
    doSomething;
  }

  {
    2 * {3 + 4}
  }
}