Le 29/12/2017 à 20:15, Bart Schaefer a écrit :

> Shell language is a programming language.  Do you know any other
> programming languages?  Do you find it astonishing that you can't
> execute an incomplete C or Java program?
The question is not to know if the interpreter can execute an incomplete 
program. The point is to send a signal to the interpreter which order to 
interrupt usual parsing and try to interpret what was already buffered 
right now. Of course it can fails. But a program interpretation can fail 
even when "it is complete".

On a side humoristic note, one might perfectly imagine an interpreter 
that try to infer realistic expectation, or more simply associate a 
valid program to any random input. ;)