Auto merge of rust-lang#70743 - oli-obk:eager_const_to_pat_conversion, r=eddyb

Fully destructure constants into patterns

r? `@varkor`

as discussed in https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/constants.20in.20patterns/near/192789924

we should probably crater it once reviewed

Author: bors

std/src/ffi/os_str.rs

@@ -94,7 +94,7 @@ pub struct OsString {
 // `OsStr::from_inner` current implementation relies
 // on `OsStr` being layout-compatible with `Slice`.
 // When attribute privacy is implemented, `OsStr` should be annotated as `#[repr(transparent)]`.
-// Anyway, `OsStr` representation and layout are considered implementation detail, are
+// Anyway, `OsStr` representation and layout are considered implementation details, are
 // not documented and must not be relied upon.
 pub struct OsStr {
     inner: Slice,