Disallow expressions without parens

[Samyak2]

Something like this is heresy against lisp (shows current behaviour):

spresso> print
built-in function
spresso> print "hello"
"hello"
spresso> + 10 20
20
spresso> define x 10
Runtime Error: Symbol not found: x
In input[3]:
1   | define x 10
             ^

spresso>

[Samyak2]

This happens because we allow expressions separated by whitespace (including newlines). Each token in the original example is considered a separate expression which are executed sequentially and the result of the last expression is printed.

Another example which looks normal:

spresso> (define x 10) (define y 20) (define z 30)
30

[Samyak2]

One option is to only allow multiple expressions separated by newlines and not spaces.