diff options
| author | bors <bors@rust-lang.org> | 2018-05-05 14:29:42 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2018-05-05 14:29:42 +0000 |
| commit | fa30ae5c7ec5f097fb7b82dd6eb4c0d8d1d3f76a (patch) | |
| tree | 1a974e37608b8b9047f13019591673af03fa5c36 /src/test | |
| parent | 2d847dc90fd9dcfeb549bad91a306096dbe08f2d (diff) | |
| parent | 1e38eee63b0a0a3429a59dd756c852116b4d3615 (diff) | |
Auto merge of #50441 - kornelski:debughint, r=kornelski
Suggest more helpful formatting string
Based on [user feedback](https://users.rust-lang.org/t/ux-feedback-from-a-rust-newbie/17220) the minimal suggestion of `:?` is unclear.
Also `{:#?}` is much more readable than the standard debug, so this PR suggests it to help surface this nice feature.
Diffstat (limited to 'src/test')
| -rw-r--r-- | src/test/ui/on-unimplemented/no-debug.stderr | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/test/ui/on-unimplemented/no-debug.stderr b/src/test/ui/on-unimplemented/no-debug.stderr index 5d8f80e57b0..275cd91a435 100644 --- a/src/test/ui/on-unimplemented/no-debug.stderr +++ b/src/test/ui/on-unimplemented/no-debug.stderr @@ -2,16 +2,17 @@ error[E0277]: `Foo` doesn't implement `std::fmt::Debug` --> $DIR/no-debug.rs:20:27 | LL | println!("{:?} {:?}", Foo, Bar); - | ^^^ `Foo` cannot be formatted using `:?`; add `#[derive(Debug)]` or manually implement `std::fmt::Debug` + | ^^^ `Foo` cannot be formatted using `{:?}` | = help: the trait `std::fmt::Debug` is not implemented for `Foo` + = note: add `#[derive(Debug)]` or manually implement `std::fmt::Debug` = note: required by `std::fmt::Debug::fmt` error[E0277]: `no_debug::Bar` doesn't implement `std::fmt::Debug` --> $DIR/no-debug.rs:20:32 | LL | println!("{:?} {:?}", Foo, Bar); - | ^^^ `no_debug::Bar` cannot be formatted using `:?` because it doesn't implement `std::fmt::Debug` + | ^^^ `no_debug::Bar` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug` | = help: the trait `std::fmt::Debug` is not implemented for `no_debug::Bar` = note: required by `std::fmt::Debug::fmt` @@ -20,18 +21,20 @@ error[E0277]: `Foo` doesn't implement `std::fmt::Display` --> $DIR/no-debug.rs:21:23 | LL | println!("{} {}", Foo, Bar); - | ^^^ `Foo` cannot be formatted with the default formatter; try using `:?` instead if you are using a format string + | ^^^ `Foo` cannot be formatted with the default formatter | = help: the trait `std::fmt::Display` is not implemented for `Foo` + = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead = note: required by `std::fmt::Display::fmt` error[E0277]: `no_debug::Bar` doesn't implement `std::fmt::Display` --> $DIR/no-debug.rs:21:28 | LL | println!("{} {}", Foo, Bar); - | ^^^ `no_debug::Bar` cannot be formatted with the default formatter; try using `:?` instead if you are using a format string + | ^^^ `no_debug::Bar` cannot be formatted with the default formatter | = help: the trait `std::fmt::Display` is not implemented for `no_debug::Bar` + = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead = note: required by `std::fmt::Display::fmt` error: aborting due to 4 previous errors |