Delete special handling of some expr kinds from print_let

In all four of Break, Closure, Ret, Yeet, the needs_par_as_let_scrutinee
is guaranteed to return true because the .precedence().order() of those
expr kinds is <= AssocOp::LAnd.precedence().

The relevant functions in rustc_ast::util::parser are:

    fn needs_par_as_let_scrutinee(order: i8) -> bool {
        order <= prec_let_scrutinee_needs_par() as i8
    }

    fn prec_let_scrutinee_needs_par() -> usize {
        AssocOp::LAnd.precedence()
    }

The .precedence().order() of Closure is PREC_CLOSURE (-40) and of Break,
Ret, Yeet is PREC_JUMP (-30).

The value of AssocOp::LAnd.precedence() is 6.

So this commit causes no change in behavior, only potentially
performance by doing a redundant call to contains_exterior_struct_lit in
those four cases. This is fine because Break, Closure, Ret, Yeet should
be exceedingly rare in the position of a let scrutinee.

0 files changed, 0 insertions, 0 deletions