This verifies that TrustedRandomAccess has no side effects when the
iterator item implements Copy. This also implements TrustedLen and
TrustedRandomAccess for str::Bytes.
Record semantic types for all syntactic types in bodies
... and use recorded types in type privacy checking (types are recorded after inference, so there are no `_`s left).
Also use `hir_ty_to_ty` for types in signatures in type privacy checking.
This could also be potentially useful for save-analysis and diagnostics.
Fixes https://github.com/rust-lang/rust/pull/42125#issuecomment-305987755
r? @eddyb
std::sync::RwLock docs improvement
Addresses the `RwLock` part of #29377.
r? @steveklabnik
Added examples, links to types, and a small comparison between RwLock and Mutex.
Less confusing placeholder when RefCell is exclusively borrowed
Based on ExpHP's comment in [*RefCell.borrow_mut get strange result*](https://users.rust-lang.org/t/refcell-borrow-mut-get-strange-result/12994):
> it would perhaps be nicer if it didn't put something that could be misinterpreted as a valid string value
The previous Debug implementation would show:
RefCell { value: "<borrowed>" }
The new one is:
RefCell { value: <borrowed> }
rustc: Don't use DelimToken::None if possible
This commit fixes a regression from #44601 where lowering attribute to HIR now
involves expanding interpolated tokens to their actual tokens. In that commit
all interpolated tokens were surrounded with a `DelimToken::None` group of
tokens, but this ended up causing regressions like #44730 where the various
attribute parsers in `syntax/attr.rs` weren't ready to cope with
`DelimToken::None`. Instead of fixing the parser in `attr.rs` this commit
instead opts to just avoid the `DelimToken::None` in the first place, ensuring
that the token stream should look the same as it did before where possible.
Closes#44730
Make `-Z borrowck-mir` imply that `EndRegion`'s should be emitted.
Before this change, the `-Z borrowck-mir` flag is useless if you do not also pass `-Z emit-end-regions`.
So, in the same spirit as f2892ad281, make `-Z borrowck-mir` also emit `EndRegion` statements. (This will hopefully avoid some initial speed bumps for new-comers helping out with NLL.)
fix an incorrect assertion in the doc example for `std::io::copy`
I think this wasn't caught by CI because the `foo` wrapper function was only defined and not called. This seems to be the norm for doc examples that define a `foo` function. Is that on purpose?
Expand size_of docs
This PR does 3 things.
1. Adds a description of what pointer size means to the primitive pages for usize and isize.
2. Says the general size of things is not stable from compiler to compiler.
3. Adds a table of sizes of things that we do guarantee. As this is the first table in the libstd docs, I've included a picture of how that looks.
