pretty-printer loses parens around expr_fail in cast #953
Description
fn f() { (fail "boo") as float / 2.0; } becomes
fn f() { (fail "boo" as float) / 2.0; } which becomes
fn f() { fail "boo" as float / 2.0; } {{ message }}
fn f() { (fail "boo") as float / 2.0; } becomes
fn f() { (fail "boo" as float) / 2.0; } which becomes
fn f() { fail "boo" as float / 2.0; }