Emit an error if modules are recursive.

[benl]

We don't handle recursive module yet, so should at least emit an error.

Currently, the compilation driver does into an endless loop.

[erikd]

Test is T39-RecursiveModule?.

Four modules; Main.ds, A.ds, B.ds and C.ds.

Main imports B which imports C which imports A which imports B creating a cycle: A -> B -> C -> A.

[erikd]

Fixed in the following set of patches:

Fri Nov 13 23:13:28 EST 2009 Erik de Castro Lopo <erikd@…>

• Move T39-RecursiveModule? to test/01-Error/70-Driver and update.

Fri Nov 13 22:34:31 EST 2009 Erik de Castro Lopo <erikd@…>

• Fix #39 : Error out on mutually recursive module import.

Fri Nov 13 20:18:40 EST 2009 Erik de Castro Lopo <erikd@…>

• Panic on mutually recursive modules instead of blowing the stack.

Still need to convert the panic to an error.