Lookup through extends does not reject invalid programs

[Martin Sjölund]

{{{class B

class C

Integer i;

end C;

end B;

class C

Integer j;

end C;

class A

extends B;
extends C;

end A;}}}

Results in:
{{{class A

Integer j;

end A;}}}

"The lookup of the names of extended classes should give the same result before and after flattening the extends-
clauses". -- Modelica 3.2

This means the program should actually be rejected (lookup of C in scope A results in .C before extends and .A.C after extends).

[Per Östlund]

This has been fixed in revision 7830, but in the SCodeFlatten module which is not yet used by default. I have added a test case (mofiles/InvalidExtends1.mo) to the FAILINGTESTS list, which will be moved to the normal tests when SCodeFlatten is enabled by default.