[m-rev.] For review: fix a compiler abort

[Julien Fischer]

On Wed, 28 Nov 2007, Ralph Becket wrote:

> Estimated hours taken: 8
> Branches: main
>
> Fix a bug where the compiler was throwing an exception trying to print out
> some error messages where the builtin module qualifier had been stripped
> from the sym_names.
>
> compiler/mode_util.m:
> 	In mode_get_insts_semidet/4, if a user-defined mode name is
> 	unqualified and the lookup fails, qualify the name with
> 	the mercury_public_builtin_module and try again.

Do you have an example of some code where this is happening?
(Are lambda expressions involved?)
What stage is the compiler up to when the exception is thrown?

Julien.
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