0061a2232d
Detect Python-style f-string debug syntax in format strings and emit a
clear diagnostic explaining that it is not supported in Rust. When the
intended operation can be inferred, suggest the corresponding Rust
alternative e.g from `println!("{=}", x)` to `dbg!({x})`.
Signed-off-by: Usman Akinyemi <usmanakinyemi202@gmail.com>
94 lines
2 KiB
Rust
94 lines
2 KiB
Rust
// ignore-tidy-tab
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fn main() {
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format!("{
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a");
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//~^ ERROR invalid format string
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format!("{ \
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\
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b");
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//~^ ERROR invalid format string
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format!(r#"{ \
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rawc"#);
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//~^^^ ERROR invalid format string
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format!(r#"{ \n
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\n
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rawd"#);
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//~^^^ ERROR invalid format string
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format!("{ \n
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\n
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e");
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//~^ ERROR invalid format string
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format!("
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{
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a");
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//~^ ERROR invalid format string
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format!("
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{
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a
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");
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//~^^ ERROR invalid format string
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format!(" \
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{ \
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\
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b");
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//~^ ERROR invalid format string
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format!(" \
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{ \
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\
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b \
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\
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");
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//~^^^ ERROR invalid format string
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format!(r#"
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raw { \
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\
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c"#);
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//~^^^ ERROR invalid format string
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format!(r#"
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raw { \n
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\n
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d"#);
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//~^^^ ERROR invalid format string
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format!("
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{ \n
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\n
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e");
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//~^ ERROR invalid format string
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format!("
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{asdf
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}
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", asdf=1);
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// ok - this is supported
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format!("
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{
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asdf}
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", asdf=1);
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//~^^ ERROR invalid format string
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println!("\t{}");
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//~^ ERROR 1 positional argument in format string
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// note: `\x7B` is `{`
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println!("\x7B}\u{8} {", 1);
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//~^ ERROR invalid format string: expected `}` but string was terminated
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println!("\x7B}\u8 {", 1);
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//~^ ERROR incorrect unicode escape sequence
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// note: raw strings don't escape `\xFF` and `\u{FF}` sequences
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println!(r#"\x7B}\u{8} {"#, 1);
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//~^ ERROR invalid format string: unmatched `}` found
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println!(r#"\x7B}\u8 {"#, 1);
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//~^ ERROR invalid format string: unmatched `}` found
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println!("{x?}, world!",);
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//~^ ERROR invalid format string: expected `}`, found `?`
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println!("{x,}, world!",);
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//~^ ERROR invalid format string: python's numeric grouping `,` is not supported in rust format strings
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println!("{x=}");
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//~^ ERROR invalid format string: python's f-string debug `=` is not supported in rust, use `dbg(x)` instead
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}
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