cebd2dda1d
Simplify `for` loop desugar
Basically two intermediate bindings are inlined. I could have left one intermediate binding in place as this would simplify some diagnostic logic, but I think the difference in that regard would be negligible, so it is better to have a minimal HIR.
For checking that the pattern is irrefutable, I added a special case when the `match` is found to be non-exhaustive.
The reordering of the arms is purely stylistic. I don't *think* there are any perf implications.
```diff
match IntoIterator::into_iter($head) {
mut iter => {
$label: loop {
- let mut __next;
match Iterator::next(&mut iter) {
- Some(val) => __next = val,
None => break,
+ Some($pat) => $block,
}
- let $pat = __next;
- $block
}
}
}
```
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| .. | ||
| alloc | ||
| backtrace@b02ed04a7e | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| portable-simd | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@cfba59fccd | ||
| test | ||
| unwind | ||