Method start_fstring

compiler/src/modules/lexer/scan.rs:192–200

(&mut self, start: usize, prefix_end: usize)

    // F-strings: emits Start/Middle/End and suspends at `{`.

    fn start_fstring(&mut self, start: usize, prefix_end: usize) {
        let quote = self.src[prefix_end];
        let triple = self.src.get(prefix_end + 1) == Some(&quote) && self.src.get(prefix_end + 2) == Some(&quote);
        let quote_len = if triple { 3 } else { 1 };
        self.pos = prefix_end + quote_len;
        let body_start = self.pos;
        self.scan_fstring_body(quote, triple, body_start);
        self.pending.push((TokenType::FstringStart, self.line, start, body_start));
    }

    fn scan_fstring_body(&mut self, quote: u8, triple: bool, body_start: usize) {
        let ql: usize = if triple { 3 } else { 1 };