| Age | Commit message (Collapse) | Author | Lines |
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`syntax_expand` -> `rustc_expand`
`syntax_pos` -> `rustc_span`
`syntax_ext` -> `rustc_builtin_macros`
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This should be used when trying to get at subsets of a larger span,
especially when the larger span is not available in the code attempting
to work with those subsets (especially common in the fmt_macros crate).
This is usually a good replacement for (BytePos, BytePos) and (usize,
usize) tuples.
This commit also removes from_inner_byte_pos, since it took usize
arguments, which is error prone.
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Point spans to inner elements of format strings
- Point at missing positional specifiers in string literal
```
error: invalid reference to positional arguments 3, 4 and 5 (there are 3 arguments)
--> $DIR/ifmt-bad-arg.rs:34:38
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LL | format!("{name} {value} {} {} {} {} {} {}", 0, name=1, value=2);
| ^^ ^^ ^^
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= note: positional arguments are zero-based
```
- Point at named formatting specifier in string literal
```
error: there is no argument named `foo`
--> $DIR/ifmt-bad-arg.rs:37:17
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LL | format!("{} {foo} {} {bar} {}", 1, 2, 3);
| ^^^^^
```
- Update label for formatting string in "multiple unused formatting arguments" to be more correct
```
error: multiple unused formatting arguments
--> $DIR/ifmt-bad-arg.rs:42:17
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LL | format!("", 1, 2); //~ ERROR: multiple unused formatting arguments
| -- ^ ^
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| multiple missing formatting specifiers
```
- When using `printf` string formatting, provide a structured suggestion instead of a note
```
error: multiple unused formatting arguments
--> $DIR/format-foreign.rs:12:30
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LL | println!("%.*3$s %s!/n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
| -------------- ^^^^^^^^ ^^^^^^^ ^
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| multiple missing formatting specifiers
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= note: printf formatting not supported; see the documentation for `std::fmt`
help: format specifiers in Rust are written using `{}`
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LL | println!("{:.2$} {}!/n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
| ^^^^^^ ^^
```
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These were stabilized in March 2018's #47813, and are the Preferred Way
to Do It going forward (q.v. #51043).
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This also implements ExactSizeIterator where applicable.
Addresses most of the Iterator traits mentioned in #23708.
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Like #43008 (f668999), but _much more aggressive_.
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This teaches `format_args!` how to interpret format printf- and
shell-style format directives. This is used in cases where there are
unused formatting arguments, and the reason for that *might* be because
the programmer is trying to use the wrong kind of formatting string.
This was prompted by an issue encountered by simulacrum on the #rust IRC
channel. In short: although `println!` told them that they weren't using
all of the conversion arguments, the problem was in using printf-syle
directives rather than ones `println!` would undertand.
Where possible, `format_args!` will tell the programmer what they should
use instead. For example, it will suggest replacing `%05d` with `{:0>5}`,
or `%2$.*3$s` with `{1:.3$}`. Even if it cannot suggest a replacement,
it will explicitly note that Rust does not support that style of directive,
and direct the user to the `std::fmt` documentation.
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