423a5d3e85
Previously:
error: invalid format string: invalid argument name `_x`
--> src/main.rs:2:16
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2 | println!("{_x}", a=0);
| ^^ invalid argument name in format string
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= note: argument names cannot start with an underscore
Not supporting identifiers starting with underscore appears to have been
an arbitrary limitation from 2013 in code that was most likely never
reviewed:
https://github.com/rust-lang/rust/pull/8245/files#diff-0347868ef389c805e97636623e4a4ea6R277
The error message was dutifully improved in #50610 but is there any
reason that leading underscore would be a special case?
This commit updates the format_args parser to accept identifiers with
leading underscores.
125 lines
4 KiB
Text
125 lines
4 KiB
Text
error: invalid format string: expected `'}'` but string was terminated
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--> $DIR/format-string-error.rs:4:16
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LL | println!("{");
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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: unmatched `}` found
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--> $DIR/format-string-error.rs:7:15
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LL | println!("}");
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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: invalid argument name `_`
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--> $DIR/format-string-error.rs:9:23
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LL | let _ = format!("{_}", _ = 6usize);
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| ^ invalid argument name in format string
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= note: argument name cannot be a single underscore
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error: invalid format string: invalid argument name `_`
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--> $DIR/format-string-error.rs:11:25
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LL | let _ = format!("{a:_}", a = "", _ = 0);
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| ^ invalid argument name in format string
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= note: argument name cannot be a single underscore
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error: invalid format string: invalid argument name `_`
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--> $DIR/format-string-error.rs:13:26
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LL | let _ = format!("{a:._$}", a = "", _ = 0);
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| ^ invalid argument name in format string
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= note: argument name cannot be a single underscore
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error: invalid format string: expected `'}'` but string was terminated
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--> $DIR/format-string-error.rs:15:23
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LL | let _ = format!("{");
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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: unmatched `}` found
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--> $DIR/format-string-error.rs:17:22
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LL | let _ = format!("}");
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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.rs:19:23
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LL | let _ = format!("{\}");
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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 `'}'` but string was terminated
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--> $DIR/format-string-error.rs:21:35
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LL | let _ = format!("\n\n\n{\n\n\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 `'}'` but string was terminated
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--> $DIR/format-string-error.rs:27:3
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LL | {"###);
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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 `'}'` but string was terminated
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--> $DIR/format-string-error.rs:35:1
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LL | {
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| - because of this opening brace
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LL |
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LL | "###);
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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: unmatched `}` found
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--> $DIR/format-string-error.rs:41:2
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LL | }
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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.rs:49:9
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LL | }
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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: 3 positional arguments in format string, but there are 2 arguments
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--> $DIR/format-string-error.rs:53:15
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LL | println!("{} {} {}", 1, 2);
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| ^^ ^^ ^^ - -
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error: aborting due to 14 previous errors
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