less eager error messages

[MasseGuillaume]

http://www.reddit.com/r/scala/comments/1ry84t/hey_this_is_the_codebrewio_team_we_just_launched/cdsei3t

Odersky

This looks really cool, thanks for sharing!
One small suggestion for improvement: I noted that while I type a function definition, the editor gives me syntax errors because the definition is not yet complete. I would prefer if I could type the line in full before seeing errors. There's an incompleteInputError in Parser which signifies that the error appears at the last character. Maybe that can be used. Alternatively, one could simply mask errors on the last line, as long as the cursor has not left it.