Eliom_client_valueSourceSee the manual.
Client values on the server are created by the syntax {typ{ expr }} in the server section (cf. the manual). They are abstract, but become concrete once sent to the client. See also the concrete representation on the client.
Raised if a client value of the given closure ID is created at a point in time where it is neither global (i.e. during the initialization of the server program), nor request (i.e. during the processing of a request).