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##### String Generators

See here for more information about String Generators.

Expression | Attribute | Description
--- | --- | ---
`str` | `Unused` | Generate `str`
`lit(str)` | `Unused` | Generate `str`
`string` | `Str` | Generate string supplied as the attribute
`string(str)` | `Str` | Generate `str`, if an attribute is supplied it must match
`symbols<Attr, T>` | `Attr` | Declare a symbol table, `sym`. `Attr` is the The type of the original attribute to be used as the key into the symbol generator. `T` is the data type associated with each key.

    sym.add
        (attr1, val1)
        (attr2, val2)
        /*...more...*/
    ;

N/A

Add symbols into a symbol table, `sym`. val1 and val2 are optional data of type `T`, the data type associated with each key.

`sym` | `T` | Emits entries in the symbol table, `sym`. If attribute is found in the symbol table, the corresponding value is emitted. If `sym` does not store values, the original attribute is emitted.