[m-rev.] for review: error messages for mutables

[Ralph Becket]

Julien Fischer, Sunday, 11 September 2005:
> 
> For review by Ralph.
> 
> Estimated hours taken: 12
> Branches: main
> 
> Improve the error checking for mutable declarations.
> 
> Fix a bug with solver types and sub-modules reported by Peter Hawkins.
> 
> Workaround a bug with mutable declarations and sub-modules.  Currently,
> the compiler aborts if there is a mutable declaration in the parent module.
> With this change mutable declarations will not be visible in child modules.

That looks good, although I don't think you meant to include the OpenGL
stuff in this diff.  Watch out for that when you commit.
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