[m-rev.] for review: disallow impure parallel conjuncts

[Peter Wang]

On 2006-08-15, Peter Wang <wangp at students.csse.unimelb.edu.au> wrote:
> Estimated hours taken: 1.5
> Branches: main
> 
> Disallow impure parallel conjuncts as they can introduce concurrency issues.
> e.g. in the following X could be bound to `foo' or `bar' in different runs.
> 
>     impure set_mutvar(foo),
>     (
> 	semipure get_mutvar(X)
>     &
> 	impure set_mutvar(bar)
>     )

Committed this.

Peter
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