Automatic compilation of partially available C source code

Aiui Eclipse JDT (and probably other IDEs too) do something similar. It takes code that currently is not valid and tries to massage the AST until it becomes valid so that it can perform type-inference and use the type information to offer valid autocomplete suggestions even at the currently invalid location.

Can somebody in simple but technical terms explain how this works? (I tried to no avail)

I wish it was called "Psychi-c"

This should've been around in my early days learning C and trying to get my project to compile :)

Neat.

The header code generated contains<p><i>typedef int bool;</i><p>I am not sure if I want that in my header.