for_ch named "foreach", "forchain"(or even "4ch"), the crate provides a macro to flatten the nested for-loop and if-let.
rust
for_ch! {
for x in 0..10;
for y in x..10; // you can add a label before `for`
if let Some(z) = foo(x, y).await?;
if x - y < z { continue; }
println!("x = {}, y = {}, z = {}", x, y, z);
}
would expend to
rust
for x in 0..10 {
for y in x..10 {
if let Some(z) = foo(x, y).await? {
if x - y < z { continue; }
println!("x = {}, y = {}, z = {}", x, y, z);
}
}
}