privat/nit — pull request #327 by privat (2014-03-11 19:13:29+00:00)
Title: abstract_compiler: show who require a declaration when not fulfilled

~~~
No provided declaration for SOME_strage_symbol
aborted
~~~

is not the best error message when developing the compiler.

This patch attach node to requirements, so the origin of the request
can be shown on error.

Signed-off-by: Jean Privat