{"record":{"id":"d06f5a71a33f52ae","repo":"DioxusLabs/dioxus","slug":"failed-to-parse-formatted-segment-expected-ident","errorCode":null,"errorMessage":"Failed to parse formatted segment: Expected Ident or Expression","messagePattern":"Failed to parse formatted segment: Expected Ident or Expression","errorType":"validation","errorClass":"syn::Error","httpStatus":null,"severity":"error","filePath":"packages/rsx/src/ifmt.rs","lineNumber":327,"sourceCode":"}\n\n#[derive(Debug, PartialEq, Eq, Clone, Hash)]\npub enum FormattedSegmentType {\n    Expr(Box<Expr>),\n    Ident(Ident),\n}\n\nimpl FormattedSegmentType {\n    fn parse(input: &str) -> Result<Self> {\n        if let Ok(ident) = parse_str::<Ident>(input)\n            && ident == input\n        {\n            return Ok(Self::Ident(ident));\n        }\n        if let Ok(expr) = parse_str(input) {\n            Ok(Self::Expr(Box::new(expr)))\n        } else {\n            Err(Error::new(\n                Span::call_site(),\n                \"Failed to parse formatted segment: Expected Ident or Expression\",\n            ))\n        }\n    }\n}\n\nimpl ToTokens for FormattedSegmentType {\n    fn to_tokens(&self, tokens: &mut TokenStream) {\n        match self {\n            Self::Expr(expr) => expr.to_tokens(tokens),\n            Self::Ident(ident) => ident.to_tokens(tokens),\n        }\n    }\n}\n\nimpl Parse for IfmtInput {\n    fn parse(input: ParseStream) -> Result<Self> {","sourceCodeStart":309,"sourceCodeEnd":345,"githubUrl":"https://github.com/DioxusLabs/dioxus/blob/393d190a801ccb441d41923e232289b4f8a5c669/packages/rsx/src/ifmt.rs#L309-L345","documentation":"ifmt parse error: the text between `{}` in an inline RSX format string is parsed with syn and must be a valid Rust identifier or expression. Anything syn rejects (empty braces, stray tokens, broken syntax) fails with this compile error.","triggerScenarios":"Empty interpolation `\"{}\"`, mismatched delimiters `\"{f(}\"`, two identifiers `\"{foo bar}\"`, or leftover JS template syntax `\"${x}\"` inside RSX formatted strings.","commonSituations":"Typos in interpolation expressions; porting JSX/JS template literals that keep `${}`; stray newlines or control characters pasted inside the braces.","solutions":["Fix the expression inside the braces so it is valid standalone Rust","If the braces are meant to be literal text, escape them as `{{` and `}}`","For long or complex expressions, compute the value in a variable first and interpolate only the identifier"],"exampleFix":"// before\nrsx! { span { \"name: {user.name.trim(}\" } }\n\n// after\nrsx! { span { \"name: {user.name.trim()}\" } }","handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":["Write interpolations that are valid standalone Rust expressions before pasting them into strings","When porting JS templates, strip ${} syntax down to {} with a Rust expression inside","Avoid pasting unedited multi-line expressions into interpolation slots"],"tags":["rsx","ifmt","syntax","expression","compile-time"],"backgroundTag":null,"analyzedSha":"393d190a801ccb441d41923e232289b4f8a5c669","analyzedAt":"2026-08-16T11:27:45.815Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}