Implement `fmt::Debug` for all structures in libstd. #38006

frewsxcv · 2016-11-25T18:58:06Z

Part of #31869.

Also turn on the missing_debug_implementations lint at the crate
level.

rust-highfive · 2016-11-25T18:58:21Z

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

frewsxcv · 2016-11-25T18:59:08Z

There is room for improvement for some of these Debug implementations. In particular, making some of the structure internals more transparent and more helpful than SomeStruct { .. }.

frewsxcv · 2016-11-25T19:09:12Z

@rkruppe Asked me on IRC to report the diff in size for libstd.rlib ~~and libcore.rlib~~ before and after these changes. Will report back whenever that's done.

frewsxcv · 2016-11-25T20:52:08Z

Via: stat -f%z ./build/x86_64-apple-darwin/stage1/lib/rustlib/x86_64-apple-darwin/lib/libstd-27c1e6e5074b72f7.rlib

Before: 8810254
After: 8933270 (+1.39%)

bluss · 2016-11-27T16:22:01Z

src/libstd/ascii.rs

@@ -370,6 +371,13 @@ impl ExactSizeIterator for EscapeDefault {}
 #[unstable(feature = "fused", issue = "35602")]
 impl FusedIterator for EscapeDefault {}

+#[stable(feature = "std-debug", since = "")]


All other feature names use underscore to separate

bluss · 2016-11-27T16:24:56Z

src/libstd/io/mod.rs

+#[stable(feature = "std-debug", since = "")]
+impl<T, U> fmt::Debug for Chain<T, U> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("Chain {{ .. }}")


IMO the IO adaptors should print their inner reader/writers. They have nice debug output too. This must be addressed now, because the bounds on T, U need to change and so on.

bluss · 2016-11-27T16:26:26Z

src/libstd/collections/hash/map.rs

+#[stable(feature = "std-debug", since = "")]
+impl<'a, K, V> fmt::Debug for Iter<'a, K, V> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("Iter {{ .. }}")


Same: Shouldn't this show the elements? Must be addressed now because that changes the K, V bounds.

Good point. I didn't think about the breaking nature of these impls in the future to more restrictive bounds. Thanks for pointing that out!

With regards to what should be displayed here for Debug, I agree that we would ideally display the keys+values here, but do you have any opinions how it should look? Alternatively, would it be bad to (at least initially) have K: Debug bounds even if we don't display the values?

I don't think redundant bounds are bad, there's good reason for it.

Displaying the elements is simple using .entries() https://doc.rust-lang.org/nightly/std/fmt/struct.DebugMap.html

Oh I managed to forget that this is an iterator and maybe it should have a new or different style of display.. I don't know.

bluss · 2016-11-27T16:27:40Z

src/libstd/collections/hash/map.rs

@@ -1577,6 +1605,13 @@ impl<K, V> ExactSizeIterator for IntoIter<K, V> {
 #[unstable(feature = "fused", issue = "35602")]
 impl<K, V> FusedIterator for IntoIter<K, V> {}

+#[stable(feature = "std-debug", since = "")]
+impl<K, V> fmt::Debug for IntoIter<K, V> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {


Even the IntoIter might want to show the elements, even if it can not iterate itself, it can maybe borrow itself as a by-reference iterator (now or in the future). Which means K, V need to impl debug.

ollie27 · 2016-11-28T00:31:42Z

src/libstd/ascii.rs

+#[stable(feature = "std_debug", since = "")]
+impl fmt::Debug for EscapeDefault {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("EscapeDefault {{ .. }}")


Why {{ and }}? These aren't format strings.

frewsxcv · 2016-11-28T04:20:45Z

@bluss @ollie27 Comments have been addressed. Let me know if you have any other feedback.

frewsxcv · 2016-11-28T04:23:59Z

src/libstd/collections/hash/map.rs

@@ -1282,7 +1291,7 @@ pub struct IterMut<'a, K: 'a, V: 'a> {
 /// HashMap move iterator.
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct IntoIter<K, V> {
-    inner: table::IntoIter<K, V>,
+    pub(super) inner: table::IntoIter<K, V>,


Necessary because HashSet uses HashMap internally and it needs access to this inner field to get the underlying entries without mutating.

Couldn't HashSet just delegate to the implementations of Debug in here rather than accessing the fields directly?

As of 0aaa778, the Debug impls for the HashSet items will print lists of entries. If we relied on the 'Debug impl for HashMap' for HashSet, it would print lists of tuple key/value pairs, which will print () for the values, which is not ideal.

Hm for now instead of pub(super) could this just be a public function in this module to get access to the table? We could then avoid exporting that as part of the hash_map module.

Hm for now instead of pub(super) could this just be a public function in this module to get access to the table? We could then avoid exporting that as part of the hash_map module.

@alexcrichton Would this be accomplished by changing this line to explicitly export every thing but your new proposed function? Otherwise, wouldn't that function also get exported?

Yeah that'd be the change, but I guess yeah that'd be pretty tough to change. Let's just leave this for now.

alexcrichton

Thanks for the PR! Could the since fields for the stability tags also get filled in here for 1.15.0?

alexcrichton · 2016-11-28T16:14:30Z

src/libstd/collections/hash/map.rs

@@ -1282,7 +1291,7 @@ pub struct IterMut<'a, K: 'a, V: 'a> {
 /// HashMap move iterator.
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct IntoIter<K, V> {
-    inner: table::IntoIter<K, V>,
+    pub(super) inner: table::IntoIter<K, V>,


Couldn't HashSet just delegate to the implementations of Debug in here rather than accessing the fields directly?

alexcrichton · 2016-11-28T16:18:03Z

src/libstd/os/linux/raw.rs

@@ -47,7 +47,7 @@ mod arch {
    #[stable(feature = "raw_ext", since = "1.1.0")] pub type time_t = i64;

    #[repr(C)]
-    #[derive(Clone)]
+    #[derive(Clone, Debug)]


These types are long since deprecated and otherwise this Debug is sort of just a portability hazard (got to remember to change everything in this folder). Perhaps these could be omitted?

frewsxcv · 2016-11-28T22:07:35Z

@alexcrichton Your comments have been addressed.

alexcrichton · 2016-11-29T23:48:18Z

@rfcbot fcp merge

rfcbot · 2016-11-29T23:50:43Z

Team member @alexcrichton has proposed to merge this. The next step is review by the rest of the tagged teams:

No concerns currently listed.

Once these reviewers reach consensus, this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

bors · 2016-11-30T23:38:14Z

☔ The latest upstream changes (presumably #37800) made this pull request unmergeable. Please resolve the merge conflicts.

bors · 2016-12-07T23:04:21Z

☔ The latest upstream changes (presumably #38214) made this pull request unmergeable. Please resolve the merge conflicts.

frewsxcv · 2016-12-08T20:03:00Z

Rebased. Merged conflicts have been addressed.

frewsxcv · 2016-12-12T14:28:21Z

@brson Have any thoughts here?

bors · 2016-12-18T22:11:24Z

☔ The latest upstream changes (presumably #38369) made this pull request unmergeable. Please resolve the merge conflicts.

Part of rust-lang#31869. Also turn on the `missing_debug_implementations` lint at the crate level.

frewsxcv · 2016-12-19T01:51:04Z

Rebased.

rfcbot · 2016-12-19T22:43:21Z

🔔 This is now entering its final comment period, as per the review above. 🔔

psst @alexcrichton, I wasn't able to add the final-comment-period label, please do so.

alexcrichton · 2016-12-20T00:17:23Z

@bors: r+

Thanks for being patient @frewsxcv!

bors · 2016-12-20T00:17:24Z

📌 Commit 86fc63e has been approved by alexcrichton

bors · 2016-12-20T02:03:16Z

⌛ Testing commit 86fc63e with merge d2dc2b4...

bors · 2016-12-20T02:06:27Z

💔 Test failed - auto-mac-32-opt

frewsxcv · 2016-12-20T07:00:47Z

@bors retry

Looks intermittent?

frewsxcv · 2016-12-20T17:13:53Z

@bors retry

bors · 2016-12-20T17:42:03Z

⌛ Testing commit 86fc63e with merge d946ed1...

bors · 2016-12-20T17:44:03Z

💔 Test failed - auto-mac-32-opt

alexcrichton · 2016-12-20T17:45:08Z

@bors: retry

…

On Tue, Dec 20, 2016 at 9:44 AM, bors ***@***.***> wrote: 💔 Test failed - auto-mac-32-opt <https://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/11398> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#38006 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAD95EfUo0vtaCan4ky2G_Sp2PlPu3ZHks5rKBPmgaJpZM4K8qag> .

Implement `fmt::Debug` for all structures in libstd. Part of rust-lang#31869. Also turn on the `missing_debug_implementations` lint at the crate level.

Rollup of 29 pull requests - Successful merges: #37761, #38006, #38131, #38150, #38158, #38171, #38208, #38215, #38236, #38245, #38289, #38302, #38315, #38346, #38388, #38395, #38398, #38418, #38432, #38451, #38463, #38468, #38470, #38471, #38472, #38478, #38486, #38493, #38498 - Failed merges: #38271, #38483

tamird · 2017-03-17T01:28:23Z

This wasn't actually in 1.15.0, so it seems like the stability attributes are incorrect?

frewsxcv · 2017-03-17T01:34:57Z

@tamird Good catch, though that was addressed in #39393

Version 1.16.0 (2017-03-16) =========================== Language -------- * Lifetimes in statics and consts default to `'static`. [RFC 1623] * [The compiler's `dead_code` lint now accounts for type aliases][38051]. * [Uninhabitable enums (those without any variants) no longer permit wildcard match patterns][38069] * [Clean up semantics of `self` in an import list][38313] * [`Self` may appear in `impl` headers][38920] * [`Self` may appear in struct expressions][39282] Compiler -------- * [`rustc` now supports `--emit=metadata`, which causes rustc to emit a `.rmeta` file containing only crate metadata][38571]. This can be used by tools like the Rust Language Service to perform metadata-only builds. * [Levenshtein based typo suggestions now work in most places, while previously they worked only for fields and sometimes for local variables][38927]. Together with the overhaul of "no resolution"/"unexpected resolution" errors (#[38154]) they result in large and systematic improvement in resolution diagnostics. * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than `U`][38670] * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798] * [`rustc` no longer attempts to provide "consider using an explicit lifetime" suggestions][37057]. They were inaccurate. Stabilized APIs --------------- * [`VecDeque::truncate`] * [`VecDeque::resize`] * [`String::insert_str`] * [`Duration::checked_add`] * [`Duration::checked_sub`] * [`Duration::checked_div`] * [`Duration::checked_mul`] * [`str::replacen`] * [`str::repeat`] * [`SocketAddr::is_ipv4`] * [`SocketAddr::is_ipv6`] * [`IpAddr::is_ipv4`] * [`IpAddr::is_ipv6`] * [`Vec::dedup_by`] * [`Vec::dedup_by_key`] * [`Result::unwrap_or_default`] * [`<*const T>::wrapping_offset`] * [`<*mut T>::wrapping_offset`] * `CommandExt::creation_flags` * [`File::set_permissions`] * [`String::split_off`] Libraries --------- * [`[T]::binary_search` and `[T]::binary_search_by_key` now take their argument by `Borrow` parameter][37761] * [All public types in std implement `Debug`][38006] * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327] * [`Ipv6Addr` implements `From<[u16; 8]>`][38131] * [Ctrl-Z returns from `Stdin.read()` when reading from the console on Windows][38274] * [std: Fix partial writes in `LineWriter`][38062] * [std: Clamp max read/write sizes on Unix][38062] * [Use more specific panic message for `&str` slicing errors][38066] * [`TcpListener::set_only_v6` is deprecated][38304]. This functionality cannot be achieved in std currently. * [`writeln!`, like `println!`, now accepts a form with no string or formatting arguments, to just print a newline][38469] * [Implement `iter::Sum` and `iter::Product` for `Result`][38580] * [Reduce the size of static data in `std_unicode::tables`][38781] * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`, `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement `Display`][38909] * [`Duration` implements `Sum`][38712] * [`String` implements `ToSocketAddrs`][39048] Cargo ----- * [The `cargo check` command does a type check of a project without building it][cargo/3296] * [crates.io will display CI badges from Travis and AppVeyor, if specified in Cargo.toml][cargo/3546] * [crates.io will display categories listed in Cargo.toml][cargo/3301] * [Compilation profiles accept integer values for `debug`, in addition to `true` and `false`. These are passed to `rustc` as the value to `-C debuginfo`][cargo/3534] * [Implement `cargo --version --verbose`][cargo/3604] * [All builds now output 'dep-info' build dependencies compatible with make and ninja][cargo/3557] * [Build all workspace members with `build --all`][cargo/3511] * [Document all workspace members with `doc --all`][cargo/3515] * [Path deps outside workspace are not members][cargo/3443] Misc ---- * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies the path to the Rust implementation][38589] * [The `armv7-linux-androideabi` target no longer enables NEON extensions, per Google's ABI guide][38413] * [The stock standard library can be compiled for Redox OS][38401] * [Rust has initial SPARC support][38726]. Tier 3. No builds available. * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No builds available. * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379] Compatibility Notes ------------------- * [Uninhabitable enums (those without any variants) no longer permit wildcard match patterns][38069] * In this release, references to uninhabited types can not be pattern-matched. This was accidentally allowed in 1.15. * [The compiler's `dead_code` lint now accounts for type aliases][38051]. * [Ctrl-Z returns from `Stdin.read()` when reading from the console on Windows][38274] * [Clean up semantics of `self` in an import list][38313] [37057]: rust-lang/rust#37057 [37761]: rust-lang/rust#37761 [38006]: rust-lang/rust#38006 [38051]: rust-lang/rust#38051 [38062]: rust-lang/rust#38062 [38062]: rust-lang/rust#38622 [38066]: rust-lang/rust#38066 [38069]: rust-lang/rust#38069 [38131]: rust-lang/rust#38131 [38154]: rust-lang/rust#38154 [38274]: rust-lang/rust#38274 [38304]: rust-lang/rust#38304 [38313]: rust-lang/rust#38313 [38314]: rust-lang/rust#38314 [38327]: rust-lang/rust#38327 [38401]: rust-lang/rust#38401 [38413]: rust-lang/rust#38413 [38469]: rust-lang/rust#38469 [38559]: rust-lang/rust#38559 [38571]: rust-lang/rust#38571 [38580]: rust-lang/rust#38580 [38589]: rust-lang/rust#38589 [38670]: rust-lang/rust#38670 [38712]: rust-lang/rust#38712 [38726]: rust-lang/rust#38726 [38781]: rust-lang/rust#38781 [38798]: rust-lang/rust#38798 [38909]: rust-lang/rust#38909 [38920]: rust-lang/rust#38920 [38927]: rust-lang/rust#38927 [39048]: rust-lang/rust#39048 [39282]: rust-lang/rust#39282 [39379]: rust-lang/rust#39379 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen [cargo/3296]: rust-lang/cargo#3296 [cargo/3301]: rust-lang/cargo#3301 [cargo/3443]: rust-lang/cargo#3443 [cargo/3511]: rust-lang/cargo#3511 [cargo/3515]: rust-lang/cargo#3515 [cargo/3534]: rust-lang/cargo#3534 [cargo/3546]: rust-lang/cargo#3546 [cargo/3557]: rust-lang/cargo#3557 [cargo/3604]: rust-lang/cargo#3604 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md

…r=dtolnay Add T: ?Sized to `RwLockReadGuard` and `RwLockWriteGuard`'s Debug impls. For context, `MutexGuard` has `+ ?Sized` on its `Debug` impl, and all three have `+ ?Sized` on their `Display` impls. It looks like the `?Sized` was just missed when the impls were added (the impl for `MutexGuard` was added in the same PR (rust-lang#38006) with support for `T: Debug + ?Sized`, and `RwLock*Guard`s did allow `T: ?Sized` types already); the `Display` impls were added later (rust-lang#42822) with support for `T: Debug + ?Sized` types. I think this needs a T-libs-api FCP? I'm not sure if this also needs an ACP. If so I can make one. These are changes to (stable) trait impls on stable types so will be insta-stable. `@rustbot` label +T-libs-api

Add T: ?Sized to `RwLockReadGuard` and `RwLockWriteGuard`'s Debug impls. For context, `MutexGuard` has `+ ?Sized` on its `Debug` impl, and all three have `+ ?Sized` on their `Display` impls. It looks like the `?Sized` was just missed when the impls were added (the impl for `MutexGuard` was added in the same PR (rust-lang/rust#38006) with support for `T: Debug + ?Sized`, and `RwLock*Guard`s did allow `T: ?Sized` types already); the `Display` impls were added later (rust-lang/rust#42822) with support for `T: Debug + ?Sized` types. I think this needs a T-libs-api FCP? I'm not sure if this also needs an ACP. If so I can make one. These are changes to (stable) trait impls on stable types so will be insta-stable. `@rustbot` label +T-libs-api

rust-highfive assigned alexcrichton Nov 25, 2016

frewsxcv mentioned this pull request Nov 25, 2016

Missing Debug Implementations #31869

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frewsxcv force-pushed the libstd-debug branch 2 times, most recently from a7996c9 to 89f2bea Compare November 25, 2016 19:21

bluss reviewed Nov 27, 2016

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ollie27 reviewed Nov 28, 2016

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frewsxcv commented Nov 28, 2016

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alexcrichton reviewed Nov 28, 2016

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alexcrichton added the T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. label Nov 28, 2016

frewsxcv force-pushed the libstd-debug branch 2 times, most recently from 4087edf to 95fc36c Compare December 1, 2016 03:16

frewsxcv force-pushed the libstd-debug branch from 95fc36c to a6dfd24 Compare December 8, 2016 20:02

frewsxcv force-pushed the libstd-debug branch from a6dfd24 to ba950dd Compare December 15, 2016 23:37

Implement fmt::Debug for all structures in libstd.

86fc63e

Part of rust-lang#31869. Also turn on the `missing_debug_implementations` lint at the crate level.

frewsxcv force-pushed the libstd-debug branch from ba950dd to 86fc63e Compare December 18, 2016 22:57

alexcrichton mentioned this pull request Dec 20, 2016

Rollup of 29 pull requests #38499

Merged

bors merged commit 86fc63e into rust-lang:master Dec 21, 2016

frewsxcv deleted the libstd-debug branch March 17, 2017 01:29

zachs18 mentioned this pull request Oct 24, 2023

Add T: ?Sized to RwLockReadGuard and RwLockWriteGuard's Debug impls. #117138

Merged

Implement fmt::Debug for all structures in libstd. #38006

Implement fmt::Debug for all structures in libstd. #38006

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Implement `fmt::Debug` for all structures in libstd. #38006

Implement `fmt::Debug` for all structures in libstd. #38006

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