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f06f9bbd3a
Make `Duration` respect `width` when formatting using `Debug` When printing or writing a `std::time::Duration` using `Debug` formatting, it previously completely ignored any specified `width`. This is unlike types like integers and floats, which do pad to `width`, for both `Display` and `Debug`, though not all types consider `width` in their `Debug` output (see e.g. #30164). Curiously, `Duration`'s `Debug` formatting *did* consider `precision`. This PR makes `Duration` pad to `width` just like integers and floats, so that ```rust format!("|{:8?}|", Duration::from_millis(1234)) ``` returns ``` |1.234s | ``` Before you ask "who formats `Debug` output?", note that `Duration` doesn't actually implement `Display`, so `Debug` is currently the only way to format `Duration`s. I think that's wrong, and `Duration` should get a `Display` implementation, but in the meantime there's no harm in making the `Debug` formatting respect `width` rather than ignore it. I chose the default alignment to be left-aligned. The general rule Rust uses is: numeric types are right-aligned by default, non-numeric types left-aligned. It wasn't clear to me whether `Duration` is a numeric type or not. The fact that a formatted `Duration` can end with suffixes of variable length (`"s"`, `"ms"`, `"µs"`, etc.) made me lean towards left-alignment, but it would be trivial to change it. Fixes issue #88059. |
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| alloc.rs | ||
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| array.rs | ||
| ascii.rs | ||
| atomic.rs | ||
| bool.rs | ||
| cell.rs | ||
| char.rs | ||
| clone.rs | ||
| cmp.rs | ||
| const_ptr.rs | ||
| intrinsics.rs | ||
| lazy.rs | ||
| lib.rs | ||
| macros.rs | ||
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| mem.rs | ||
| nonzero.rs | ||
| ops.rs | ||
| option.rs | ||
| pattern.rs | ||
| pin.rs | ||
| ptr.rs | ||
| result.rs | ||
| slice.rs | ||
| str_lossy.rs | ||
| str.rs | ||
| task.rs | ||
| time.rs | ||
| tuple.rs | ||
| unicode.rs | ||