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Docs: fix incorrect copy-paste for new X? in formatting strings - #49161
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SimonSapin referenced
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Mar 19, 2018
Add hexadecimal formatting of integers with fmt::Debug
This can be used for integers within a larger types which implements Debug (possibly through derive) but not fmt::UpperHex or fmt::LowerHex.
```rust
assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]");
assert!(format!("{:02X?}", b"Foo\0") == "[46, 6F, 6F, 00]");
```
RFC: rust-lang/rfcs#2226
The new formatting string syntax (`x?` and `X?`) is insta-stable in this PR because I don’t know how to change a built-in proc macro’s behavior based of a feature gate. I can look into adding that, but I also strongly suspect that keeping this feature unstable for a time period would not be useful as possibly no-one would use it during that time.
This PR does not add the new (public) `fmt::Formatter` proposed in the API because:
* There was some skepticism on response to this part of the RFC
* It is not possible to implement as-is without larger changes to `fmt`, because `Formatter` at the moment has no easy way to tell apart for example `Octal` from `Binary`: it only has a function pointer for the relevant `fmt()` method.
If some integer-like type outside of `std` want to implement this behavior, another RFC will likely need to propose a different public API for `Formatter`.KodrAus
commented
Mar 19, 2018
Contributor
D'oh! The most obvious things are always the hardest to see. @bors r+ |
bors
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Mar 19, 2018
Collaborator
📌 Commit 741d7a5 has been approved by |
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bors
commented
Mar 19, 2018
Collaborator
⌛ Testing commit 741d7a5 with merge 02e297165031c3a7eebc4eca4282cd4da810bc93... |
emilyalbini
commented
Mar 19, 2018
Member
Wut, both Travis and AppVeyor failed to clone the repository, and bors didn't update. @bors retry rollup |
bors
commented
Mar 19, 2018
Collaborator
@pietroalbini: 🔑 Insufficient privileges: Not in reviewers |
alexcrichton
commented
Mar 19, 2018
Member
@bors: retry bors is having a rough day... |
kennytm added a commit
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Mar 20, 2018
…rAus Docs: fix incorrect copy-paste for new `X?` in formatting strings
bors added a commit
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Mar 20, 2018
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