Brace yourself

my $car = %models{$wanted};

• Let's look at the code to extract $wanted out of this expression into an AST

ruleHashSubscriptBraces = do
    between (symbol "{") (char '}') $ option id $ do
        exp <- ruleExpression; return $ \x -> Syn "{}" [x, exp]

• Three lines is more than it'd take with a regexp...
• but it does a little more.
• We know some of this already