(1) In 3.1.5.1 Example: Partial Application of an Anonymous Function, the expression is not valid XPath. XPath does not allow multiple let clauses. 

(2) Ditto in 3.1.5.1 Example: Derived Types and Non-local Variable Bindings

Rewrite as

let $incr := 1,
    $f := function ($i as xs:decimal) as xs:decimal { $i + $incr }
return $f(5)

(3) In 3.1.5.3 Function coercion, the example is XQuery-only (search for "declare function")

(4) In 3.1.5.3 the example starting "let $m := map {..." has multiple let clauses.


I confined my testing to code tagged with @role='parse-test'. There are many more examples that could usefully have this attribute.