Advanced Strings

[sdgoodrick]

        let(name="Tim") in "Hello, {name}."   # String interpolation 

        "Hello, "+name+"."                    # String concatenation 

        s.length                              # String length 

        s.slice[2,10]                         # String slice (may fail) 

[bbartman]

We need to implement lexing and parsing for string interpolation.