Method maybe_parse

src/sql-parser/src/parser.rs:2020–2035

(&mut self, mut f: F)

    #[must_use]
    fn maybe_parse<T, F>(&mut self, mut f: F) -> Option<T>
    where
        F: FnMut(&mut Self) -> Result<T, ParserError>,
    {
        if self.speculative_failures >= SPECULATIVE_FAILURES_PER_TOKEN * self.tokens.len() {
            return None;
        }
        let index = self.index;
        if let Ok(t) = f(self) {
            Some(t)
        } else {
            self.index = index;
            self.speculative_failures += 1;
            None
        }
    }

    /// Parse a SQL CREATE statement
    fn parse_create(&mut self) -> Result<Statement<Raw>, ParserStatementError> {