SL allows the user to reference SL values in quoted JavaScript code by prefixing the value's name with a '$' character. At the moment, the user can refer to any SL name and the compiler does not take scoping or even existence of the value into account.

It is desirable, that the compiler checks if all SL names referenced in a JavaScript quote exist and are visible in the current scope.

At the moment, quoted JavaScript code is used in a raw fashion by the back-end, i.e., the compiler performs no checks on the code supplied by the user and all syntactic errors occur at run time.

It is desirable to hint on such errors at compile time of the SL program. To do so, the compiler should perform syntax and well-formedness checks on the quoted JavaScript code.

JavaScript quotes can be annotated with an invalid type, e.g., a not fully applied constructor type or even a type which does not exist in the current scope.

For example, the following program is considered correct as part of the compilers context analysis phase, even though there is no type Foo:

DEF foo = {| console.log("FooBar") |} : DOM Foo