WIP, unchecked for typos, ideas on possible if-let, let-chain, and let-else syntax, using commas and a contextual and keyword.
fn f() {
let Some(x) = foo(),
and let Ok(y) = bar(x),
and y <= z,
else {
}
let Some(x) = foo.next(), else {
return;
}
if y <= x, {
}
if y <= X {}, {
}
if a < b, and c < d {
}
let x = foo(), else {
}
if let Some(x) = bar() {
}
////////////////////////////////////////////////////////////////////////////////////////////////////
if !(foo() && bar()) {
panic!()
}
if !foo() || !bar() {
panic!()
}
// but the ones below clearly indicate that the function (or loop of try block) will be exited
// if the condition fails
foo() && bar(), else {
panic!()
}
foo(), and bar(), else {
panic!()
}
foo(),
and bar(),
else {
panic!()
}
////////////////////////////////////////////////////////////////////////////////////////////////////
let Some(x) = foo(v),
and bar(x) < z,
else if v.abc() {
// diverge
} else {
// diverge
}
if let Some(x) = a + b, and x > 42 {
}
if let Some(x) = a + b,
and x > 42,
and let Ok(foo) = x.try_add(100.pow(42)),
{
}
if FooB {
x: 42,
y: 24,
}.try_build().is_some(),
{
// …
}
// subtle around commas though
let x: () = if foo {} else { /* diverge */ };
let x: () = if foo {},
else {
/* diverge */
}
;
}