Expression-language evaluation fails loudly
The rule
Normative: this is the rule
An expression-language expression that cannot be parsed, that cannot be evaluated, or that references a name absent from the context fails: it raises an error and yields no value.
Rule identifiers are permanent and are never renumbered. Each implementation publishes its own standing against these rules; this specification does not.spec 1.0-draft · LANG-6 · changed in spec 1.0