DioxusLabs/dioxus · error · syn::Error

Failed emit valid rsx - likely due to partially complete exp

Error message

Failed emit valid rsx - likely due to partially complete expressions in the rsx! macro

What it means

Error "Failed emit valid rsx - likely due to partially complete expressions in the rsx! macro" thrown in DioxusLabs/dioxus.

Source

Thrown at packages/autofmt/src/lib.rs:102

        // this macro is inside the last macro we parsed, skip it
        if macro_path.span().start() < end_span {
            continue;
        }

        let body = item.parse_body_with(CallBody::parse_strict)?;

        let rsx_start = macro_path.span().start();

        writer.out.indent_level = writer
            .out
            .indent
            .count_indents(writer.src.get(rsx_start.line - 1).unwrap_or(&""));

        // TESTME
        // Writing *should* not fail but it's possible that it does
        if writer.write_rsx_call(&body).is_err() {
            let span = writer.invalid_exprs.pop().unwrap_or_else(Span::call_site);
            return Err(syn::Error::new(
                span,
                "Failed emit valid rsx - likely due to partially complete expressions in the rsx! macro",
            ));
        }

        // writing idents leaves the final line ended at the end of the last ident
        if writer.out.buf.contains('\n') {
            _ = writer.out.new_line();
            _ = writer.out.tab();
        }

        let span = item.delimiter.span().join();
        let mut formatted = writer.out.buf.split_off(0);
        let start = collect_macros::byte_offset(contents, span.start()) + 1;
        let end = collect_macros::byte_offset(contents, span.end()) - 1;

        // Rustfmt will remove the space between the macro and the opening paren if the macro is a single expression
        let body_is_solo_expr = body.body.roots.len() == 1

View on GitHub (pinned to 393d190a80)

When it happens

Trigger: Thrown at packages/autofmt/src/lib.rs:102 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@393d190a80 (2026-08-16). Data as JSON: /api/errors/c38d8b188011d438. Report an issue: GitHub.