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Usman Akinyemi
76ad528d32
Detect Python-style numeric grouping syntax in format strings (e.g. `{x:,}`)
and emit a clear diagnostic explaining that it is not supported in Rust.
This helps users coming from Python understand the error without exposing
the full set of valid Rust format specifiers.
Signed-off-by: Usman Akinyemi <usmanakinyemi202@gmail.com>
203 lines
6.0 KiB
Plaintext
203 lines
6.0 KiB
Plaintext
error: incorrect unicode escape sequence
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--> $DIR/format-string-error-2.rs:77:20
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LL | println!("\x7B}\u8 {", 1);
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| ^^^
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help: format of unicode escape sequences uses braces
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LL - println!("\x7B}\u8 {", 1);
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LL + println!("\x7B}\u{8} {", 1);
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error: invalid format string: expected `}`, found `a`
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--> $DIR/format-string-error-2.rs:5:5
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LL | format!("{
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| - because of this opening brace
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LL | a");
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `b`
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--> $DIR/format-string-error-2.rs:9:5
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LL | format!("{ \
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| - because of this opening brace
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LL | \
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LL | b");
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `\`
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--> $DIR/format-string-error-2.rs:11:18
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LL | format!(r#"{ \
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| - ^ expected `}` in format string
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| because of this opening brace
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `\`
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--> $DIR/format-string-error-2.rs:15:18
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LL | format!(r#"{ \n
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| - ^ expected `}` in format string
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| |
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| because of this opening brace
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `e`
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--> $DIR/format-string-error-2.rs:21:5
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LL | format!("{ \n
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| - because of this opening brace
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LL | \n
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LL | e");
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `a`
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--> $DIR/format-string-error-2.rs:25:5
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LL | {
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| - because of this opening brace
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LL | a");
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `a`
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--> $DIR/format-string-error-2.rs:29:5
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LL | {
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| - because of this opening brace
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LL | a
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `b`
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--> $DIR/format-string-error-2.rs:35:5
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LL | { \
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| - because of this opening brace
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LL | \
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LL | b");
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `b`
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--> $DIR/format-string-error-2.rs:40:5
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LL | { \
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| - because of this opening brace
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LL | \
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LL | b \
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `\`
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--> $DIR/format-string-error-2.rs:45:8
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LL | raw { \
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| - ^ expected `}` in format string
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| |
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| because of this opening brace
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `\`
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--> $DIR/format-string-error-2.rs:50:8
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LL | raw { \n
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| - ^ expected `}` in format string
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| because of this opening brace
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `e`
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--> $DIR/format-string-error-2.rs:57:5
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LL | { \n
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| - because of this opening brace
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LL | \n
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LL | e");
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: expected `}`, found `a`
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--> $DIR/format-string-error-2.rs:67:5
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LL | {
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| - because of this opening brace
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LL | asdf}
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| ^ expected `}` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
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error: 1 positional argument in format string, but no arguments were given
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--> $DIR/format-string-error-2.rs:70:17
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LL | println!("\t{}");
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| ^^
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error: invalid format string: expected `}` but string was terminated
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--> $DIR/format-string-error-2.rs:74:27
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LL | println!("\x7B}\u{8} {", 1);
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| -^ expected `}` in format string
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| |
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| because of this opening brace
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= note: if you intended to print `{`, you can escape it using `{{`
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error: invalid format string: unmatched `}` found
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--> $DIR/format-string-error-2.rs:81:21
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LL | println!(r#"\x7B}\u{8} {"#, 1);
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| ^ unmatched `}` in format string
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= note: if you intended to print `}`, you can escape it using `}}`
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error: invalid format string: unmatched `}` found
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--> $DIR/format-string-error-2.rs:84:21
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LL | println!(r#"\x7B}\u8 {"#, 1);
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| ^ unmatched `}` in format string
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= note: if you intended to print `}`, you can escape it using `}}`
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error: invalid format string: expected `}`, found `?`
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--> $DIR/format-string-error-2.rs:87:17
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LL | println!("{x?}, world!",);
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| ^
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| |
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| expected `:` before `?` to format with `Debug` in format string
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| help: add a colon before the format specifier: `:?`
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= note: to print `{`, you can escape it using `{{`
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error: invalid format string: python's numeric grouping `,` is not supported in rust format strings
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--> $DIR/format-string-error-2.rs:89:17
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LL | println!("{x,}, world!",);
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| - ^ expected `}` in format string
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| because of this opening brace
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= note: to print `{`, you can escape it using `{{`
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error: aborting due to 20 previous errors
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