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Fixes #22927
This commit is contained in:
Steve Klabnik 2015-03-18 19:15:26 -04:00 • committed by Manish Goregaokar
parent 351721cde6
commit 8a8b2cecbc
1 changed files with 12 additions and 5 deletions
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17
src/libcollections/fmt.rs
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@ -105,11 +105,18 @@
//! hexadecimal as well as an
//! octal.
//!
//! There are various parameters which do require a particular type, however.
//! Namely if the syntax `{:.*}` is used, then the number of characters to print
//! precedes the actual object being formatted, and the number of characters
//! must have the type `usize`. Although a `usize` can be printed with `{}`, it is
//! illegal to reference an argument as such. For example this is another
//! There are various parameters which do require a particular type, however. Namely, the `{:.*}`
//! syntax, which sets the number of numbers after the decimal in floating-point types:
//!
//! ```
//! let formatted_number = format!("{:.*}", 2, 1.234567);
//!
//! assert_eq!("1.23", formatted_number)
//! ```
//!
//! If this syntax is used, then the number of characters to print precedes the actual object being
//! formatted, and the number of characters must have the type `usize`. Although a `usize` can be
//! printed with `{}`, it is illegal to reference an argument as such. For example this is another
//! invalid format string:
//!
//! ```text