PR# 15195 Wrong line number or wrong source code shown for VTCG on expanded class

A root class test has an attribute

   x: TEST1 [TEST]

Class TEST1 is declared as

   expanded class TEST1 [G -> ANY create default_create end]

but the tokens are spaced out on separate lines with intervening blank lines.

The declaration of `x' does not meet the creation constraint since TEST does
not list `default_create' as a creation procedure.  The compiler correctly
detects the error and reports it.  However, it says:

-------------------------------------------------------------------------------

Error code: VTCG
Error: actual generic parameter does not conform to constraint.
What to do: make sure that actual parameter is a type conforming to the
  constraint (the type appearing after `->' for the corresponding formal).

Class: TEST
Feature: x
In declaration: TEST1 [TEST]

For type: TEST1 [TEST]
Formal #1: TEST
Unmet creation constraint features:
default_create
Line: 41 (source code is not available)

-------------------------------------------------------------------------------

Note the "source code is not available".  Line 41 is the line where formal
generic G appears in class TEST1 but it seems that the compiler is trying
to display line 41 of class TEST, which does not exist since TEST is only
13 lines long.  Something is wrong here.  Either the compiler should be 
displaying a different line number (one that corresponds to a construct in
TEST) or it should be displaying line 41 from class TEST1.

Unfortunately, I cannot write an eweasel test for this because eweasel does
not currently support line number specification for validity errors.

Compile with attached classes and config file.

Attachments for problem report #15195