Function expression_literal

crates/gitql-parser/src/parser.rs:3861–3866

(expression: &Box<dyn Expr>)

#[inline(always)]
#[allow(clippy::borrowed_box)]
fn expression_literal(expression: &Box<dyn Expr>) -> Option<String> {
    if let Some(symbol) = expression.as_any().downcast_ref::<SymbolExpr>() {
        return Some(symbol.value.to_string());
    }
    None
}

#[inline(always)]
fn resolve_symbol_type_or_undefine(env: &mut Environment, name: &String) -> Box<dyn DataType> {