absent precision parameter for floating point format string is undocumented #131159
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A-docs
Area: Documentation for any part of the project, including the compiler, standard library, and tools
A-floating-point
Area: Floating point numbers and arithmetic
A-fmt
Area: `core::fmt`
C-bug
Category: This is a bug.
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Relevant to the library team, which will review and decide on the PR/issue.
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Feb 6, 2025
error on empty precision Fixes rust-lang#131159 by erroring on missing precision. Alternatively we could document current behavior.
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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A format precision specifier consisting of a dot and no number actually does nothing and has no specified meaning. Currently this is silently ignored, but it may turn into a warning or error. See rust-lang/rust#131159 and rust-lang/rust#136638
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I am talking about format strings of the form
format!"{:.}", 1.234). The corresponding documentation for the precision argument is here. The documentation writes that the format is.NwhereNis an integer specifying the precision.The bug is that it is not documented that
Ncan also be absent. Either this should not be accepted by the compiler or it should be documented.I believe the intention is that an absent
Nmeans the same thing as if there was no precision specified at all (no:.). Note that this is not the same as "as much precision as needed".The text was updated successfully, but these errors were encountered: